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Found 209 results

  1. Embodi3D member tserhardt has uploaded an outstanding tutorial on using the Grayscale Model Maker module in the free software program 3D slicer to create 3D printable anatomic models. Read her tutorial here. Thanks for sharing with the community!
  2. I receive a lot of inquiries to my account. I'm going to try to share them with the community in the hope that any information that is shared can help many others. A member recently contacted me and asked the following: "Do you have any experience in dicom images by TUI mode in Voluson E10, for print 3d fetus models" Unfortunately, I don't personally have experience with 3D printing ultrasound images. I'm not sure how the slice-by-slice registration will work as ultrasound images are not in fixed orthographic planes. However, I know it must be possible since there is a company that is 3D printing fetuses. http://www.3ders.org/articles/20160118-3d-printed-fetuses-the-hottest-parenting-trend-of-2016.html Anyone in the community have experience with converting ultrasound to STL?
  3. There is an RSNA 3D printing Special Interest Group (SIG) meeting this August 31, 2017 in Washington DC at the FDA. This is an important meeting since we want to make sure that 3D printing remains open to everybody and the FDA doesn't required expensive, proprietary and FDA-approved software for medical 3D printing. If you want to know more about the SIG, here is the page. Non-physicians can join. https://www.rsna.org/3D-Printing-SIG/
  4. In this tutorial we will learn how to easily create a 3D printable dental, orthodontic, or maxillofacial bone model quickly and easily using the free democratiz3D file conversion service on the embodi3D.com website. Creating the 3D printable dental model takes about 10 minutes and requires no prior experience or specialized knowledge. Dental 3D printing is one of the many uses for democratiz3D. You can 3D print teeth, braces, dental implants and so much more. Step 1: Download the CT scan file for dental 3D printing. Go to the navigation bar on the embodi3D.com website and click on the Download menu. This is shown in Figure 1. Figure 1: The Download menu This will take you to the download section of the website, which has a very large and extensive library of 3D printable anatomy files and source medical scan files. Look for the category along the right side of the page that says Medical Scan Files. Click on the section within that that says Dental, Orthodontic, Maxillofacial, as shown in Figure 2. Figure 2: Viewing the medical scan library on the embodi3D website This section contains anonymized CT scans of the teeth and face. Many of the scans in this section are perfect for 3D printing dental models. For this tutorial we will use the file openbiteupdated by member gcross, although you can use any source CT scan. This particular scan is a good one to choose because the patient does not have metallic fillings which can create streak artifact which can lower the quality of the model. Click on the link below to go to the file download page. Step 2: Preview the Dental CT scan file. Once you've downloaded the file you can inspect the CT scan using 3D Slicer. If you don't know about 3D Slicer, it is a free open source medical image viewing software package that can be downloaded from slicer.org. Once you have installed and opened Slicer, you can drag-and-drop the downloaded NRRD file onto the slicer window and it will open for you to view. You can see as shown in Figure 3 that the file appears to be quite good, without any dental fillings that cause streak artifact. Figure 3: Viewing the dental CT scan in Slicer. Step 3: Upload your dental CT scan NRRD file to the democratiz3D online service. Now that we are happy with our NRRD source file, we can upload it to the democratiz3D service for conversion into a 3D printable STL file. On the embodi3D website click on the democratiz3D navigation menu and Launch App, as shown in Figure 4. Figure 4: Launching the democratiz3D service. Once the online application opens, you will be asked to drag-and-drop your file onto the webpage. Go ahead and do this. Make sure that the file you are adding is an NRRD file and corresponds to a dental CT scan. An MRI will not work. This is shown in Figure 5. Figure 5: Dragging and dropping the CT scan NRRD file onto the democratiz3D application page. Step 4: Fill in basic information about your uploaded scan and generated model file While the file is uploading you can begin to fill out some of the required form fields. There are two main sections to the form. The section labeled 3 pertains to the file currently being uploaded, the NRRD file. Section 4 pertains to the generated STL file that democratiz3D will create. In Section 3 fill out a filename and a short description of your uploaded NRRD file. Specify whether you want the file to be private or shared, and whether this is a free file or a paid file that you wish to sell. You must choose a license type, although this is only really applicable if your file is shared as if it is private nobody will be able to download it. This portion of the form is shown in Figure 6. Figure 6: Filling out the submission form, part 1. Enter in information related to the uploaded NRRD file. Next proceed to section 4, the portion of the form related to the file you wish to generate. Make sure that democratiz3D processing is turned on and the slider shows green. Choose the appropriate operation. For creation of dental files, the best operation is "CT NRRD to Bone STL Detailed." This takes a CT scan in NRRD file format and converts it to a bone STL file using maximum detail. Leave the threshold at the default value of 150. Set quality to high. Make sure that you specify whether you want the file to be private or shared, and free versus paid. Make sure you specify file license. The steps are shown in Figure 7. Figure 7: Filling out the submission form, part 2. Enter in information related to the generated STL file. Make sure you check the checkbox that states you agree to the terms of use, and click the submit button. Your file will now start processing. In approximately 10 minutes or so you should receive an email stating that the file has been processed and your newly created 3D printable STL model is ready for download. The email should contain a link that will take you to your file download page, which should look something like the page in Figure 8. There should be several thumbnails which show you what the model looks like. To download the file click on the Download button. Figure 8: The file download page for your newly created dental model. Step 5: Check your dental STL file for errors and send it to your dental 3D printer! Once you have downloaded the STL file open it in Meshmixer. Meshmixer is a free 3D software program available from meshmixer.com that has many handy 3D printing related features. The democratized service is a good job of creating error-free files, but occasionally a few errors will sneak through, which can be easily fixed and Meshmixer. Click on the analysis button and then select Inspector as shown in Figure 9. Click on the Auto Repair All button and any minor defects that are remaining will be automatically fixed. Make sure to save your repaired and finalized 3D printable model by clicking on the menu File -> Export. You can now send your STL file to the 3D printer of your choice. Here is an example of the model when printed on a Form 1+ using white resin. You can see that the level of detail is very good. Formlabs has several examples of 3d printing teeth and other dental applications on their website. Thank you very much. I hope this tutorial was helpful. If you are not already a member, please consider joining the embodi3D community of medical 3D printing enthusiasts. If you have any questions or comments, please feel free to post them below.
  5. Version 1.0.0

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    dental tutorial model NRRD file

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  6. I receive a lot of inquiries to my account. I'm going to try to share them with the community in the hope that any information that is shared can help many others. A member recently contacted me and asked the following: "I am a Biomaterials and Tissue Engineer by profession and recently got into 3d printing of medical implants. I would be greatly obliged if you could please advice me on designing 'cranial mesh' My task is to design titanium based cranial mesh. I would like to know if you can suggest me any tutorial on the same." Another member asks, " I am a resident in neurosurgery in Brazil and I have a dream to allow cheap cranioplasty for those in need that depend on Brazilian public health system. If you have some sort of tutorial using free software to make those prosthetic cranial grafts of a cheap way to make a mold out of it I will be glad to hear from you. I am planning on buying the ultimaker 2 printer which allows direct PEEK print and also PLA print for mold to go through autoclave." I must admit that I have limited experience with craniofacial implants. I know that the physicians at Walter Reed Army Medical Center in Bethesda Maryland are doing pioneering work in the field. Regarding making titanium-based implants I am unaware of any tutorials, but a search on Pubmed has yielded a few helpful articles. Here is one https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4073471/ From what I have seen most of these implants are designed using the Mimics system by Materialise. Regarding the low-cost solution for cranial implants, I'm not familiar with any freeware software that specifically does implants. From the hardware perspective, you may want to consider a Form 2 stereolithographic printer in addition to the Ultimaker 2 (FYI, there is a new Ultimaker 3 printer out). Formlabs, the makers of the Form 2 have a tutorial on using their printer to make molds for casting. https://formlabs.com/blog/3d-printing-for-injection-molding/ Formlabs has a dental biocompatible resin that I know some hospitals (Mayo Clinic) are using for in-surgery cutting guides. I heard them talk about that at a conference I recently attended. Whatever you do, make sure you follow the health safety rules in your country and take all necessary steps for patient safety.
  7. If you are planning on using the democratiz3D service to automatically convert a medical scan to a 3D printable STL model, or you just happen to be working with medical scans for another reason, it is important to know if you are working with a CT (Computed Tomography or CAT) or MRI (Magnetic Resonance Imaging) scan. In this tutorial I'll show you how to quickly and easily tell the difference between a CT and MRI. I am a board-certified radiologist, and spent years mastering the subtleties of radiology physics for my board examinations and clinical practice. My goal here is not to bore you with unnecessary detail, although I am capable of that, but rather to give you a quick, easy, and practical way to understand the difference between CT and MRI if you are a non-medical person. A Brief Overview of How CT and MRI Works For both CT (left) and MRI (right) scans you will lie on a moving table and be put into a circular machine that looks like a big doughnut. The table will move your body into the doughnut hole. The scan will then be performed. You may or may not get IV contrast through an IV. The machines look very similar but the scan pictures are totally different! CT and CAT Scans are the Same A CT scan, from Computed Tomography, and a CAT scan from Computed Axial Tomography are the same thing. CT scans are based on x-rays. A CT scanner is basically a rotating x-ray machine that takes sequential x-ray pictures of your body as it spins around. A computer then takes the data from the individual images, combines that with the known angle and position of the image at the time of exposure, and re-creates a three-dimensional representation of the body. Because CT scans are based on x-rays, bones are white and air is black on a CT scan just as it is on an x-ray as shown in Figure 1 below. Modern CT scanners are very fast, and usually the scan is performed in less than five minutes. Figure 1: A standard chest x-ray. Note that bones are white and air is black. Miscle and fat are shades of gray. CT scans are based on x-ray so body structures have the same color as they don on an x-ray. How does MRI Work? MRI uses a totally different mechanism to generate an image. MRI images are made using hydrogen atoms in your body and magnets. Yes, super strong magnets. Hydrogen is present in water, fat, protein, and most of the "soft tissue" structures of the body. The doughnut of an MRI does not house a rotating x-ray machine as it does in a CT scanner. Rather, it houses a superconducting electromagnet, basically a super strong magnet. The hydrogen atoms in your body line up with the magnetic field. Don't worry, this is perfectly safe and you won't feel anything. A radio transmitter, yes just like an FM radio station transmitter, will send some radio waves into your body, which will knock some of the hydrogen atoms out of alignment. As the hydrogen nuclei return back to their baseline position they emit a signal that can be measured and used to generate an image. MRI Pulse Sequences Differ Among Manufacturers The frequency, intensity, and timing of the radio waves used to excite the hydrogen atoms, called a "pulse sequence," can be modified so that only certain hydrogen atoms are excited and emit a signal. For example, when using a Short Tau Inversion Recovery (STIR) pulse sequence hydrogen atoms attached to fat molecules are turned off. When using a Fluid Attenuation Inversion Recovery (FLAIR) pulse sequence, hydrogen atoms attached to water molecules are turned off. Because there are so many variables that can be tweaked there are literally hundreds if not thousands of ways that pulse sequences can be constructed, each generating a slightly different type of image. To further complicate the matter, medical scanner manufacturers develop their own custom flavors of pulse sequences and give them specific brand names. So a balanced gradient echo pulse sequence is called True FISP on a Siemens scanner, FIESTA on a GE scanner, Balanced FFE on Philips, BASG on Hitachi, and True SSFP on Toshiba machines. Here is a list of pulse sequence names from various MRI manufacturers. This Radiographics article gives more detail about MRI physics if you want to get into the nitty-gritty. Figure 2: Examples of MRI images from the same patient. From left to right, T1, T2, FLAIR, and T1 post-contrast images of the brain in a patient with a right frontal lobe brain tumor. Note that tissue types (fat, water, blood vessels) can appear differently depending on the pulse sequence and presence of IV contrast. How to Tell the Difference Between a CT Scan and an MRI Scan? A Step by Step Guide Step 1: Read the Radiologist's Report The easiest way to tell what kind of a scan you had is to read the radiologist's report. All reports began with a formal title that will say what kind of scan you had, what body part was imaged, and whether IV contrast was used, for example "MRI brain with and without IV contrast," or "CT abdomen and pelvis without contrast." Step 2: Remember Your Experience in the MRI or CT (CAT) Scanner Were you on the scanner table for less than 10 minutes? If so you probably had a CT scan as MRIs take much longer. Did you have to wear earmuffs to protect your hearing from loud banging during the scan? If so, that was an MRI as the shifting magnetic fields cause the internal components of the machine to make noise. Did you have to drink lots of nasty flavored liquid a few hours before the scan? If so, this is oral contrast and is almost always for a CT. How to tell the difference between CT and MRI by looking at the pictures If you don't have access to the radiology report and don't remember the experience in the scanner because the scan was A) not done on you, or you were to drunk/high/sedated to remember, then you may have to figure out what kind of scan you had by looking at the pictures. This can be complicated, but don't fear I'll show you how to figure it out in this section. First, you need to get a copy of your scan. You can usually get this from the radiology or imaging department at the hospital or clinic where you had the scan performed. Typically these come on a CD or DVD. The disc may already have a program that will allow you to view the scan. If it doesn't, you'll have to download a program capable of reading DICOM files, such as 3D Slicer. Open your scan according to the instructions of your specific program. You may notice that your scan is composed of several sets of images, called series. Each series contains a stack of images. For CT scans these are usually images in different planes (axial, coronal, and sagittal) or before and after administration of IV contrast. For MRI each series is usually a different pulse sequence, which may also be before or after IV contrast. Step 3: Does the medical imaging software program tell you what kind of scan you have? Most imaging software programs will tell you what kind of scan you have under a field called "modality." The picture below shows a screen capture from 3D Slicer. Looking at the Modality column makes it pretty obvious that this is a CT scan. Figure 3: A screen capture from the 3D Slicer program shows the kind of scan under the modality column. Step 4: Can you see the CAT scan or MRI table the patient is laying on? If you can see the table that the patient is laying on or a brace that their head or other body part is secured in, you probably have a CT scan. MRI tables and braces are designed of materials that don't give off a signal in the MRI machine, so they are invisible. CT scan tables absorb some of the x-ray photons used to make the picture, so they are visible on the scan. Figure 4: A CT scan (left) and MRI (right) that show the patient table visible on the CT but not the MRI. Step 5: Is fat or water white? MRI usually shows fat and water as white. In MRI scans the fat underneath the skin or reservoirs of water in the body can be either white or dark in appearance, depending on the pulse sequence. For CT however, fat and water are almost never white. Look for fat just underneath the skin in almost any part of the body. Structures that contained mostly water include the cerebrospinal fluid around the spinal cord in the spinal canal and around the brain, the vitreous humor inside the eyeballs, bile within the gallbladder and biliary tree of the liver, urine within the bladder and collecting systems of the kidneys, and in some abnormal states such as pleural fluid in the thorax and ascites in the abdomen. It should be noted that water-containing structures can be made to look white on CT scans by intentional mixing of contrast in the structures in highly specialized scans, such as in a CT urogram or CT myelogram. But in general if either fat or fluid in the body looks white, you are dealing with an MRI. Step 6: Is the bone black? CT never shows bones as black. If you can see bony structures on your scan and they are black or dark gray in coloration, you are dealing with an MRI. On CT scans the bone is always white because the calcium blocks (attenuates) the x-ray photons. The calcium does not emit a signal in MRI scans, and thus appears dark. Bone marrow can be made to also appear dark on certain MRI pulse sequences, such as STIR sequences. If your scan shows dark bones and bone marrow, you are dealing with an MRI. A question I am often asked is "If bones are white on CT scans, if I see white bones can I assume it is a CT?" Unfortunately not. The calcium in bones does not emit signal on MRI and thus appears black. However, many bones also contain bone marrow which has a great deal of fat. Certain MRI sequences like T1 and T2 depict fat as bright white, and thus bone marrow-containing bone will look white on the scans. An expert can look carefully at the bone and discriminate between the calcium containing cortical bone and fat containing medullary bone, but this is beyond what a layperson will notice without specialized training. Self Test: Examples of CT and MRI Scans Here are some examples for you to test your newfound knowledge. Example 1 Figure 5A: A mystery scan of the brain Look at the scan above. Can you see the table that the patient is laying on? No, so this is probably an MRI. Let's not be hasty in our judgment and find further evidence to confirm our suspicion. Is the cerebrospinal fluid surrounding the brain and in the ventricles of the brain white? No, on this scan the CSF appears black. Both CT scans and MRIs can have dark appearing CSF, so this doesn't help us. Is the skin and thin layer of subcutaneous fat on the scalp white? Yes it is. That means this is an MRI. Well, if this is an MRI than the bones of the skull, the calvarium, should be dark, right? Yes, and indeed the calvarium is as shown in Figure 5B. You can see the black egg shaped oval around the brain, which is the calcium containing skull. The only portion of the skull that is white is in the frontal area where fat containing bone marrow is present between two thin layers of calcium containing bony cortex. This is an MRI. Figure 5B: The mystery scan is a T1 spoiled gradient echo MRI image of the brain. Incidentally this person has a brain tumor involving the left frontal lobe. Example 2 Figure 6A: Another mystery scan of the brain Look at the scan above. Let's go through our process to determine if this is a CT or MRI. First of all, can you see the table the patient is lying on or brace? Yes you can, there is a U-shaped brace keeping the head in position for the scan. We can conclude that this is a CT scan. Let's investigate further to confirm our conclusion. Is fat or water white? If either is white, then this is an MRI. In this scan we can see both fat underneath the skin of the cheeks which appears dark gray to black. Additionally, the material in the eyeball is a dark gray, immediately behind the relatively white appearing lenses of the eye. Finally, the cerebrospinal fluid surrounding the brainstem appears gray. This is not clearly an MRI, which further confirms our suspicion that it is a CT. If indeed this is a CT, then the bones of the skull should be white, and indeed they are. You can see the bright white shaped skull surrounding the brain. You can even see part of the cheekbones, the zygomatic arch, extending forward just outside the eyes. This is a CT scan. Figure 6B: The mystery scan is a CT brain without IV contrast. Example 3 Figure 7A: A mystery scan of the abdomen In this example we see an image through the upper abdomen depicting multiple intra-abdominal organs. Let's use our methodology to try and figure out what kind of scan this is. First of all, can you see the table that the patient is laying on? Yes you can. That means we are dealing with the CT. Let's go ahead and look for some additional evidence to confirm our suspicion. Do the bones appear white? Yes they do. You can see the white colored thoracic vertebrae in the center of the image, and multiple ribs are present, also white. If this is indeed a CT scan than any water-containing structures should not be white, and indeed they are not. In this image there are three water-containing structures. The spinal canal contains cerebrospinal fluid (CSF). The pickle shaped gallbladder can be seen just underneath the liver. Also, this patient has a large (and benign) left kidney cyst. All of these structures appear a dark gray. Also, the fat underneath the skin is a dark gray color. This is not in MRI. It is a CT. Figure 7B: The mystery scan is a CT of the abdomen with IV contrast Example 4 Figure 8A: A mystery scan of the left thigh Identifying this scan is challenging. Let's first look for the presence of the table. We don't see one but the image may have been trimmed to exclude it, or the image area may just not be big enough to see the table. We can't be sure a table is in present but just outside the image. Is the fat under the skin or any fluid-filled structures white? If so, this would indicate it is an MRI. The large white colored structure in the middle of the picture is a tumor. The fat underneath the skin is not white, it is dark gray in color. Also, the picture is through the mid thigh and there are no normal water containing structures in this area, so we can't use this to help us. Well, if this is a CT scan than the bone should be white. Is it? The answer is no. We can see a dark donut-shaped structure just to the right of the large white tumor. This is the femur bone, the major bone of the thigh and it is black. This cannot be a CT. It must be an MRI. This example is tricky because a fat suppression pulse sequence was used to turn the normally white colored fat a dark gray. Additionally no normal water containing structures are present on this image. The large tumor in the mid thigh is lighting up like a lightbulb and can be confusing and distracting. But, the presence of black colored bone is a dead giveaway. Figure 8B: The mystery scan is a contrast-enhanced T2 fat-suppressed MRI Conclusion: Now You Can Determine is a Scan is CT or MRI This tutorial outlines a simple process that anybody can use to identify whether a scan is a CT or MRI. The democratiz3D service on this website can be used to convert any CT scan into a 3D printable bone model. Soon, a feature will be added that will allow you to convert a brain MRI into a 3D printable model. Additional features will be forthcoming. The service is free and easy to use, but you do need to tell it what kind of scan your uploading. Hopefully this tutorial will help you identify your scan. If you'd like to learn more about the democratiz3D service click here. Thank you very much and I hope you found this tutorial to be helpful. Nothing in this article should be considered medical advice. If you have a medical question, ask your doctor.
  8. The Embodi3D website offers a large and ever-growing library of 3D printable files that are available for free to anyone who signs up for a free account. Images include files from normal anatomy to those related to paleontology to complex musculoskeletal tumors. This site was founded by a practicing interventional radiologist with a passion for 3D printing and perfecting an easier method for converting files into those that may be downloaded and printed—a medical 3D printing application called democratiz3D. Commercial Medical 3D Printing Software Three-dimensional printing has become a popular research and industrial interest in the orthopaedic surgery world. International companies such as Stryker (www.stryker.com) and DePuy Synthes (www.depuysynthes.com) are now marketing designs in craniofacial reconstruction, arthroplasty, and spine deformity surgery that utilize 3D printing in order to individualize implants and surgical techniques. Specialized software for 3D printing in healthcare is sold by Materialise in an offering called Mimics. Vital Images, a medical imaging and informatics company, has partnered with Stratsys, a 3D printer manufacturer, to provide a segmentation and healthcare 3D printing solution. However, these technologies are costly, and may be cost-prohibitive for the average patient or surgeon. Three-Dimensional Printing for Patient Education and Surgical Planning Although most radiology departments currently have the capability to quickly convert a CT (computer tomography) scan to a three-dimensional image for better understanding of a patient’s anatomy, visualized anatomy cannot replace the ability to feel and manipulate a model. Three-dimensional printing can, however, bring these images to life. Printers have the capability to use differing materials, such as polymers, plastics, ceramics, metals, and biologics to create models. These models can be an excellent tool for patient and trainee education as well as surgical planning. In procedures such as complex tumors or difficult pelvic fractures, the surgeon could practice different techniques on an exact replica of the patient’s anatomy so that they have a better grasp of their approach to the patient. Furthermore, trainees currently learn and practice their surgical skills on cadaveric specimens, which can also be costly. Having access to a 3D printer that could create models could potentially decrease the utilization of cadavers. Free and Easy Medical Three-Dimensional Printing Creating files from CT scans that can be used in 3D printing is easy with the use of the Embodi3d website. Detailed instructions are available on the tutorial pages of the website, but a brief overview will be described here. CT scans may be obtained from the radiology department in DICOM format. Free software available online at www.slicer.org can be used to review the DICOM imaging, isolate the area of interest and convert to an .nrrd file. This .nrrd file may then be loaded onto the democratiz3D application and formatted in a number of ways based on threshold as shown in the images below. Files may be opened through the application or dragged and dropped into the file area (Figure 1, Figure 2). Details of the file, such as the title, description of the anatomy or pathology, and keywords are placed beneath the upload (Figure 3). Different thresholds are available to be automatically placed on the uploaded file, including bone, detailed bone, muscle, and skin (Figure 4). These files as well as the final, processed, files may be shared or remain private, free or at a fee to download by the community. Figure 1. The link to the democratiz3D application is located at the top menu bar of the main page at https://www.embodi3d.com. Figure 2. Once on the democratiz3D application, you may upload the .nrrd file or drag and drop the .nrrd file into the uploading area. Figure 3. While the .nrrd file is processing, you may edit the details of the file, such as the title, tags, and description. Figure 4. The application allows for thresholding of bone, detailed bone, muscle, and skin from the uploaded CT scan. Once the file has been processed, you receive a notification and may view the file as well as automatically created screen shots (Figure 5). This is now an STL file that may be downloaded by clicking “Download this file”. If this is a file that you have downloaded, you may also edit the details of the file, move it to another category or upload a new version of the STL file directly onto the page (Figure 6). Although the democratiz3D application is a powerful and quick tool to convert .nrrd files to STL files, it is limited by the quality of the CT scan. Therefore, users may wish to clean up the model using free software such as Meshmixer or Blender. Once the files have been edited, they are maintained as an STL file that may be directly uploaded onto the page as a new version (Figure 7). These may then be placed in a category that is most descriptive of the file (Figure 8). Figure 5. After about 5-20 minutes of processing (depending on the size of the file), you will get a notification and e-mail that the file has processed. The democrati3D application has converted the file into an STL file is now available for downloading and use in 3D printing. Figure 6. If you would like to change the details, or upload new files or screen shots, you may choose from the drop-down menu. Figure 7. In order to upload a new version of the file, such as after it is edited in the free software Meshmixer or Blender, you may choose from the drop-down menu and drag and drop a new STL file. Figure 8. Because Embodi3D has created a library divided into different categories, you may move your file into the appropriate category to allow for ease of sharing with the community. Alternatively, files that have been downloaded and edited may be uploaded as new files using the “Create” selection on the top menu (Figure 9). Once you have chosen the most accurate category (Figure 10), you can upload the new file by selecting the file or drag and drop into the proper area (Figure 11). This will then take you to similar section as outlined above in order to edit the details and sharing options for your file. Figure 9. Upload an STL file by selecting the “Create” menu at the top of the webpage. Figure 10. Select the category under which the file most accurately fits. Figure 11. Upload the STL file by dragging and dropping or selecting the file. As you can see, creating STL files from individual CT scans is an easy, 15-20 minute process that is reasonable for the busy orthopaedic surgeon to utilize in their practice. For educational purposes, however, not every trainee, surgeon, or radiologist has access to patients with such a wide array of pathologies. The Embodi3D community provides an ever-growing diverse library of normal anatomy and pathology that may be downloaded for free and used for 3D printing. The files are divided into categories including: Bones, Muscles, Cardiac and Vascular, Brain and nervous system, Organs of the Body, Veterinary, Paleontology, Anthropology, Research and Miscellaneous. In order to access these files, click “Download” from the top menu (Figure 12), which will take you to the main Downloads page (Figure 13). The categories available are listed on the right side of the page, and will bring you to each category page. There, the number of files available within each category is listed. Once the desired file is selected, the file may be downloaded as described above. Figure 12. In order to access the library of files, click “Download” from the top menu on the main page. Figure 13. The Downloads page has a listing of the available categories to browse and explore for the desired files. Creating and printing 3D models of CT scans will be useful in the future of medicine and the era of individualized medicine. The free library of medical 3D printing files available at embodi3D.com as well as the free conversion application democratiz3D will be an invaluable resource for education as well as for the private orthopaedic surgeon with limited resources. Furthermore, because healthcare costs are a main focus in the United States, having the ability to download and create models for a much lower price than through commercial 3D printing companies will be useful to decrease the cost of individualized care. For more information about 3D printing in orthopaedic surgery, please see the following references: Cai H. Application of 3D printing in orthopedics: status quo and opportunities in China. Ann Transl Med. 2015;3(Suppl 1):S12. Eltorai AEM, Nguyen E, Daniels AH. Three-Dimensional Printing in Orthopedic Surgery. Orthopedics. 2015;38(11):684-687. Mulford JS, Babazadeh S, Mackay N. Three-dimensional printing in orthopaedic surgery: review of current and future applications. ANZ J Surg. 2016;86(9):648-653. Tack P, Victor J, Gemmel P, Annemans L. 3D-printing techniques in a medical setting: a systematic literature review. Biomed Eng Online. 2016;15(1):115.
  9. It's been a while since I posted some of the things I've been up to. Here is a model of a project we just completed to design 3D printable abdominal organ and vessel models for medical device testing. These were each custom designed, printed in sintered nylon, and professionally painted.
  10. I recently attending this conference in Scottsdale Arizona. A lot of great models were on display. Here are a few for your enjoyment.
  11. Version 1.0.0

    8 downloads

    This model is the left lower extremity bone rendering of a 65-year-old male with left thigh myxoid fibrosarcoma. At the time of diagnosis, the patient had metastases to his lungs. The patient therefore underwent neoadjuvant radiotherapy, surgery, and adjuvant chemotherapy and was found to have an intermediate grade lesion at the time of diagnosis. The patient is still living with the metastatic disease at 2.5 years since diagnosis. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing The lower extremity consists of the femur, tibia, fibula, and foot. The femur has an anterior bow of differing degrees, which is important to understand when fixing a femur fracture with an intramedullary nail to not penetrate the anterior cortex. Distally, the femur includes the medial and lateral femoral condyles, which articulate with the proximal tibia to form the knee joint, as well as the trochlea anteriorly, which articulates with the patella. The proximal tibia includes the medial plateau (which is concave) and the lateral plateau (which is convex). The Proximal tibia has a 7-10 degree posterior slope. On the anterior proximal tibia, the tibial tuberosity, where the patellar tendon attaches. On the anteromedial surface of the tibia is Gerdy's tubercle, where the sartorius, gracilis, and semitendinosus attach. The distal tibia creates the superior and medial (plafond and medial malleolus) of the ankle joint. The proximal fibula is the attachment for the posterolateral corner structures of the knee joint. The peroneal nerve wraps around the fibular neck. The distal fibula is the lateral malleolus and a common site for ankle fractures. This model was created from the file STS_022.

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  12. Version 1.0.0

    6 downloads

    This model is the left leg bone rendering of a 65-year-old male with left thigh myxoid fibrosarcoma. At the time of diagnosis, the patient had metastases to his lungs. The patient therefore underwent neoadjuvant radiotherapy, surgery, and adjuvant chemotherapy and was found to have an intermediate grade lesion at the time of diagnosis. The patient is still living with the metastatic disease at 2.5 years since diagnosis. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. The leg includes the area between the knee and the ankle and houses the tibia and fibula. The proximal tibia includes the medial plateau (which is concave) and the lateral plateau (which is convex). The Proximal tibia has a 7-10 degree posterior slope. The tibial tuberosity is located on the anterior proximal tibia, which is where the patellar tendon attaches. On the anteromedial surface of the tibia is Gerdy's tubercle, where the sartorius, gracilis, and semitendinosus attach. The distal tibia creates the superior and medial (plafond and medial malleolus) of the ankle joint. The proximal fibula is the attachment for the posterolateral corner structures of the knee joint. The peroneal nerve wraps around the fibular neck. The distal fibula is the lateral malleolus and a common site for ankle fractures. The ankle is a hinge (or ginglymus) joint made of the distal tibia (tibial plafond, medial and posterior malleoli) superiorly and medially, the distal fibula (lateral malleolus) laterally and the talus inferiorly. Together, these structures form the ankle “mortise”, which refers to the bony arch. Normal range of motion is 20 degrees dorsiflexion and 50 degrees plantarflexion. Stability is provided by the anterior talofibular ligament (ATFL), calcaneofibular ligament (CFL), and posterior talofibular ligament (PTFL) laterally, and the superficial and deep deltoid ligaments medially. The ankle is one of my most common sites of musculoskeletal injury, including ankle fractures and ankle sprains, due to the ability of the joint to invert and evert. The most common ligament involved in the ATFL. The foot is commonly divided into three segments: hindfoot, midfoot, and forefoot. These sections are divided by the transverse tarsal joint (between the talus and calcaneus proximally and navicular and cuboid distally), and the tarsometatarsal joint (between the cuboids and cuneiforms proximally and the metatarsals distally). The first tarsometatarsal joint (medially) is termed the “Lisfranc” joint, and is the site of the Lisfranc injury seen primarily in athletic injuries. This model was created from the file STS_022.

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  13. Version 1.0.0

    11 downloads

    This model is the right lower extremity bone rendering of a 65-year-old male with left thigh myxoid fibrosarcoma. At the time of diagnosis, the patient had metastases to his lungs. The patient therefore underwent neoadjuvant radiotherapy, surgery, and adjuvant chemotherapy and was found to have an intermediate grade lesion at the time of diagnosis. The patient is still living with the metastatic disease at 2.5 years since diagnosis. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. The leg includes the area between the knee and the ankle and houses the tibia and fibula. The proximal tibia includes the medial plateau (which is concave) and the lateral plateau (which is convex). The Proximal tibia has a 7-10 degree posterior slope. The tibial tuberosity is located on the anterior proximal tibia, which is where the patellar tendon attaches. On the anteromedial surface of the tibia is Gerdy's tubercle, where the sartorius, gracilis, and semitendinosus attach. The distal tibia creates the superior and medial (plafond and medial malleolus) of the ankle joint. The proximal fibula is the attachment for the posterolateral corner structures of the knee joint. The peroneal nerve wraps around the fibular neck. The distal fibula is the lateral malleolus and a common site for ankle fractures. The ankle is a hinge (or ginglymus) joint made of the distal tibia (tibial plafond, medial and posterior malleoli) superiorly and medially, the distal fibula (lateral malleolus) laterally and the talus inferiorly. Together, these structures form the ankle “mortise”, which refers to the bony arch. Normal range of motion is 20 degrees dorsiflexion and 50 degrees plantarflexion. Stability is provided by the anterior talofibular ligament (ATFL), calcaneofibular ligament (CFL), and posterior talofibular ligament (PTFL) laterally, and the superficial and deep deltoid ligaments medially. The ankle is one of my most common sites of musculoskeletal injury, including ankle fractures and ankle sprains, due to the ability of the joint to invert and evert. The most common ligament involved in the ATFL. The foot is commonly divided into three segments: hindfoot, midfoot, and forefoot. These sections are divided by the transverse tarsal joint (between the talus and calcaneus proximally and navicular and cuboid distally), and the tarsometatarsal joint (between the cuboids and cuneiforms proximally and the metatarsals distally). The first tarsometatarsal joint (medially) is termed the “Lisfranc” joint, and is the site of the Lisfranc injury seen primarily in athletic injuries. This model was created from the file STS_022.

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  14. Version 1.0.0

    1 download

    This model is the bilateral thigh skin rendering of a 65-year-old male with left thigh myxoid fibrosarcoma. At the time of diagnosis, the patient had metastases to his lungs. The patient therefore underwent neoadjuvant radiotherapy, surgery, and adjuvant chemotherapy and was found to have an intermediate grade lesion at the time of diagnosis. The patient is still living with the metastatic disease at 2.5 years since diagnosis. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. Myxoid fibrosarcoma (or myxoid MFH) is the most common subtype of MFH, at about 10%-20% of cases. Clinically, the tumor presents as a deep, slow-growing, painless mass. It is located more commonly in the lower extremities and retroperitoneum. Imaging on MRI demonstrates a mass with low signal intensity on T1-weighting imaging, and high signal intensity on T2-weighted imaging. On histology, a myxoid background is present with a storiform (or cartwheel) pattern seen on low-power imaging, seen in fibrosarcomas. A “myxoid background” is composed of a clear, mucoid substance. Treatment includes radiation, wide surgical resection, and chemotherapy in selected cases. However, the 5-year survival is 50%-60% depending on size, grade, depth and presence of metastasis. The term “malignant fibrous histiocytoma” was coined in the 1960s by Margaret R. Murray when histology a sarcoma demonstrated an appearance like histiocytes, with characteristics of phagocytosis and a pleomorphic pattern. With further research, this entity was identified to have a wider range of appearances with a fibrous characteristic. Today, these sarcomas are known as “pleomorphic sarcomas.” Recently, a change in the understanding of soft tissue tumors has purported that MFH is not a specific type of cancer, but a common morphologic pattern shared by unrelated tumors. One school of thought states that this morphologic pattern is shared by tumors as a common final pathway in cancer progression whereas another school of thought believes that true pleomorphic sarcomas are the result of a transformation from mesenchymal stem cells. Future research into understanding the pathway of these sarcomas and progression will help to target specific therapies and, hopefully, eventual cures. This model was created from the file STS_022.

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  15. Version 1.0.0

    2 downloads

    This model is the left leg skin rendering of a 65-year-old male with left thigh myxoid fibrosarcoma. At the time of diagnosis, the patient had metastases to his lungs. The patient therefore underwent neoadjuvant radiotherapy, surgery, and adjuvant chemotherapy and was found to have an intermediate grade lesion at the time of diagnosis. The patient is still living with the metastatic disease at 2.5 years since diagnosis. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. Landmarks of the lower extremity consist of bony and muscular landmarks. Proximally, the extensor mechanism consists of the quadriceps tendon, patella, and the tibial tuberosity, which is located on the anterior proximal tibia, where the patellar tendon attaches. On the anteromedial surface of the tibia is Gerdy's tubercle, where the sartorius, gracilis, and semitendinosus attach. Laterally, the head of the fibula may be palpated, which is the attachment for the posterolateral corner structures of the knee joint. The peroneal nerve wraps around the fibular neck, and a tinel’s sign may be elicited due to its superficial position at this location. Distally, the anterior ankle joint may be palpated. Pain with palpation may be indicative of osteoarthritis if general or an osteochondral defect if localized. The medial and lateral malleoli are located on either side of the tibiotalar joint, respectively and are the site of common ankle fractures. Posteriorly, the Achilles tendon inserts on the calcaneus. A defect along this tendon may be a sign of a tendon rupture. The superficial peroneal nerve can possibly be isolated on the lateral aspect of the dorsal foot with full plantarflexion of the fourth ray. Topographical landmarks of the foot and ankle consist of muscular, tendinous, and bony structures. Proximally, the superficial muscles of the anterior (tibialis anterior), lateral (peroneals) and posterior (gastrocnemius) compartments may be palpated. Anteriorly, the tibialis anterior tendon crosses the ankle joint and is used as a landmark for ankle joint injections and aspirations, where the practitioner will place the needle just lateral to the tendon. Posteriorly, the gastrocnemius and soleus converge to form the Achilles tendon. Ruptures of the tendon as well as tendinous changes due to Achilles tendinopathy may be palpated. At the level of the ankle joint, the joint line, medial malleolus (distal tibia) and lateral malleolus (distal fibula) may be palpated. The extensor hallucis longus and extensor digitorum longus tendons are visible at the surface of the dorsal foot. The extensor digitorum brevis muscle belly is seen on the dorsum of the lateral foot. On the plantar foot, the plantar fascia may be palpated. Nodules associated with plantar fascial fibromatosis may be palpated here. Plantar fasciitis is also diagnosed when pain is associated with palpation of the insertion of the plantar fascia on the medial heel. Other common pathologies on the plantar foot are ulcerations associated with diabetic neuropathy and other neuropathic conditions. This model was created from the file STS_022.

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  16. Version 1.0.0

    4 downloads

    This model is the right knee skin rendering of a 65-year-old male with left thigh myxoid fibrosarcoma. At the time of diagnosis, the patient had metastases to his lungs. The patient therefore underwent neoadjuvant radiotherapy, surgery, and adjuvant chemotherapy and was found to have an intermediate grade lesion at the time of diagnosis. The patient is still living with the metastatic disease at 2.5 years since diagnosis. This is an STL file created from DICOM images of his CT scan which may be used for 3D printing. Landmarks of the lower extremity consist of bony and muscular landmarks. Prior to incision, the bone landmarks should be palpated and drawn. The patella is the largest sesamoid bone (bone located within a tendon) and is located on the anterior aspect of the knee. Along with the femur, it forms the patellofemoral joint, providing a mechanical advantage to leg extension. The quadriceps tendon inserts proximally and the patellar tendon inserts distally. The patellar tendon attaches to the tibial tubercle on the anterior aspect of the tibia. On the anteromedial surface of the tibia is Gerdy's tubercle, where the sartorius, gracilis, and semitendinosus attach. Laterally, the head of the fibula may be palpated, which is the attachment for the posterolateral corner structures of the knee joint. The peroneal nerve wraps around the fibular neck, and a tinel’s sign may be elicited due to its superficial position at this location. The knee joint can be palpated and must be accurately located in order to provide landmarks for surgeries such as arthroscopy and arthroplasty. Typically, pain with palpation of the joint line is indicative of knee pathologies such as osteoarthritis or a meniscal tear, with point tenderness at the area of the tear. Proper landmarks are essential for the success of procedures about the knee, and therefore the skin should be adequately evaluated prior to any procedure. This model was created from the file STS_022.

    Free

  17. Version 1.0.0

    1 download

    This is a 3D printable STL medical file converted from a CT scan DICOM dataset of a 78-year old female that was presented by left thigh swelling( note the difference in contour between both sides), pathological examination revealed it to be malignant fibrous histiocytosis ( pleomorphic sarcoma) of high grade malignancy. The patient underwent MRI and PET scan 7 and 8 days after the pathological examination respectively. Her treatment plan was combined surgical excision and radiotherapy. 66 days later she developed regional recurrence. After 377 days of follow up, The patient was alive with disease. ( STS-020)

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  18. Version 1.0.0

    1 download

    This is a 3D printable STL file converted from a CT scan DICOM dataset of a 54-year old male patient that was presented by a left thigh swelling. Histopathological examination revealed it to be extra-skeletal Ewing sarcoma of high grade of malignancy. 10 days prior to the diagnosis, the patient underwent MRI. 21 days after the diagnosis had been made the patient underwent PET scan examination as a part of his metastatic workup.His treatment plan was a combined chemotherapy/surgical resection of the tumor. 525 days later, the patient developed lung metastasis. 265 days later, the patient died.(STS-017)

    Free

  19. Version 1.0.0

    2 downloads

    This is a 3D printable medical file converted from a CT scan DICOM dataset of a 68-year old male presented by a swelling at the posterior aspect of the left pelvic region(notice the contour bulge at the posterior aspect of the left side). Histopathological examination revealed the swelling to be leiomyosarcoma of intermediate grade of malignancy. His work up included MRI and PET scan 3 and 24 days after the pathological examination respectively. His treatment plan was a combined radiotherapy/surgical resection of the tumor. 96 days later, the patient developed lung metastasis. He died after 607 days.(STS-018)

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  20. Version 1.0.0

    2 downloads

    This is a 3D printable STL medical file converted from a CT scan DICOM dataset of a 78-year old female that was presented by left thigh swelling, Pathological examination revealed it to be malignant fibrous histiocytosis ( pleomorphic sarcoma) of high grade malignancy. The patient underwent MRI and PET scan 7 and 8 days after the pathological examination respectively. The patient underwent combined surgical excision/radiotherapy. 66 days later the patient developed regional recurrence. After 377 days of follow up, The patient was alive with disease. ( STS-020)

    Free

  21. Version 1.0.0

    1 download

    This is a 3D printable medical file of a CT scan DICOM dataset of a 48-year old female that was presented by right hand swelling, pathological examination revealed it to be undifferentiated malignant fibrous histiocystosis of high grade of malignancy. 28 days prior to the pathological examination, the patient underwent MRI. 30 days after the diagnosis had been made, the patient underwent PET scan. Her treatment plan was combined surgical excision/radiotherapy. after 1082 days of follow up, the patient showed no evidence of disease.(STS_019)

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  22. Version 1.0.0

    8 downloads

    The ankle joint is a hinged synovial joint with primarily up-and-down movement (plantarflexion and dorsiflexion). However, when the range of motion of the ankle and subtalar joints (talocalcaneal and talocalcaneonavicular) is taken together, the complex functions as a universal joint. The bony architecture of the ankle consists of three bones: the tibia, the fibula, and the talus. The articular surface of the tibia is referred to as the plafond. The medial malleolus is a bony process extending distally off the medial tibia. The distal-most aspect of the fibula is called the lateral malleolus. Together, the malleoli, along with their supporting ligaments, stabilize the talus underneath the tibia. The bony arch formed by the tibial plafond and the two malleoli is referred to as the ankle "mortise" (or talar mortise). The mortise is a rectangular socket. The ankle is composed of three joints: the talocrural joint (also called talotibial joint, tibiotalar joint, talar mortise, talar joint), the subtalar joint (also called talocalcaneal), and the Inferior tibiofibular joint. The joint surface of all bones in the ankle are covered with articular cartilage. This a 3D printable medical file converted from a CT scan DICOM dataset of a 75-year old female.

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  23. Researchers at UC San Diego have successfully 3D printed a network of blood vessels. This is an important step towards 3D printing an entire organ. Read the full story here.
  24. Version 1.0.0

    5 downloads

    The bones of the leg and foot form part of the appendicular skeleton that supports the many muscles of the lower limbs. These muscles work together to produce movements such as standing, walking, running, and jumping. At the same time, the bones and joints of the leg and foot must be strong enough to support the body’s weight while remaining flexible enough for movement and balance. The tibia and fibulaare the bones that support the leg. The larger tibia or shinebone is located medial to the fibula and bears most of the weight. At the superior (proximal) end of the tibia, a pair of flattened condyles articulate with the rounded condyles at the distal end of the femur to form the knee joint joint. The tibia and fibula articulate at two sites. At the knee, a superior (proximal) tibiofibular joint is formed by the lateral tibial condyle and head of the fibula. At the ankle, an inferior (distal) tibiofibular joint is formed by the lower fibula and a lateral concavity (notch) on the lower tibia. The feet are flexible structures of bones, joints, muscles, and soft tissues that let us stand upright and perform activities like walking, running, and jumping. The feet are divided into three sections: -The forefoot contains the five toes (phalanges) and the five longer bones (metatarsals). -The midfoot is a pyramid-like collection of bones that form the arches of the feet. These include the three cuneiform bones, the cuboid bone, and the navicular bone. -The hindfoot forms the heel and ankle. The talus bone supports the leg bones (tibia and fibula), forming the ankle. The calcaneus (heel bone) is the largest bone in the foot. This is a 3D printable medical file converted from a CT scan dicom dataset of a 75-year female.

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  25. Version 1.0.0

    10 downloads

    The ankle joint is a hinged synovial joint with primarily up-and-down movement (plantarflexion and dorsiflexion). However, when the range of motion of the ankle and subtalar joints (talocalcaneal and talocalcaneonavicular) is taken together, the complex functions as a universal joint. The bony architecture of the ankle consists of three bones: the tibia, the fibula, and the talus. The articular surface of the tibia is referred to as the plafond. The medial malleolus is a bony process extending distally off the medial tibia. The distal-most aspect of the fibula is called the lateral malleolus. Together, the malleoli, along with their supporting ligaments, stabilize the talus underneath the tibia. The bony arch formed by the tibial plafond and the two malleoli is referred to as the ankle "mortise" (or talar mortise). The mortise is a rectangular socket. The ankle is composed of three joints: the talocrural joint (also called talotibial joint, tibiotalar joint, talar mortise, talar joint), the subtalar joint (also called talocalcaneal), and the Inferior tibiofibular joint. The joint surface of all bones in the ankle are covered with articular cartilage. This a 3D printable medical file converted from a CT scan DICOM dataset of a 75-year old female.

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