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Dr. Mike

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  1. Like
    Dr. Mike got a reaction from Allen in How to get premium democratiz3D conversions for free   
    A member recently messaged me a comment. I am posting the response here to help the general community:

    "Regarding democratiz3D, I like that it's simple to use.  Being able to convert to even higher resolution STL files for free would be nice."
    My response:
    Do you know about our Ultra quality settings? If you set democratiz3D to use ultra quality, you will get an output STL with about 3 million polygons. That is super high resolution. Files of that resolution are difficult to even open on regular PCs because of the extreme detail. 
    Ultra quality STLs take about an hour of server time to generate, and thus we cannot give them away for free. They are available with Premium subscriptions. However, you can still get them for free with our Pay or Share program. If you agree to share your STL with the community, we will pick up the tab for the conversion. It is free for you as our gift because you gave something to the community. 
    Hope this helps!
    Dr. Mike
  2. Like
    Dr. Mike reacted to Allen in 2020 Feb 11-12 Additive Manufacturing Strategies (Medicine / Dentistry and Metals / New Materials)   
    3DPrint.Com and SmarTech Analysis are offering a focused event this coming 11-12 February at the Seaport Hotel: Additive Manufacturing Strategies. This third annual iteration has two specialized and focused conferences:  Medicine/Dentistry and Metals/New Materials.  Over 50 speakers will be presenting over the two-day event and companion exhibit hall.  In addition to this being a great place to learn and network there is a startup competition in which Asimov Ventures offers a cash award to the winning entrant.  Early Bird savings end 5 December.
    Full news: https://3dprint.com/260940/focused-3d-printing-conference-and-exhibition-covering-medicine-dentistry-and-metals-new-materials-coming-to-boston-11-12-february/
  3. Like
    Dr. Mike got a reaction from Allen in International Society of Forensic Radiology and Imaging 2020   
    Thanks for sharing Terrie!
  4. Like
    Dr. Mike reacted to tsehrhardt in International Society of Forensic Radiology and Imaging 2020   
    In case there is any interest here in the applications of radiology and imaging in forensic science, I wanted to share the link to the next conference in Albuquerque, New Mexico, May 14-16, 2020: https://www.isfri2020.com/.
    I definitely plan to go and will probably submit some kind of abstract about bones from CT supplementing reference collections for forensic anthropology. The abstract submission deadline is December 12.
  5. Like
    Dr. Mike reacted to Minke van Voorthuizen in 3D Printing Service - Multi Color Models out of Paper   
    Dear Dave,
    I never made a paper print. I am a productdesigner. Therefore I am looking for a long time to make 3D prints with a paper-look instead of plastic-look.
    The last 5 years I do also a lot of work for clients working with CT and MRI scanned data. The data concerns all skeleton parts, both from Hominids as from Non Hominids. This data comes from Musea and from scientists and has most of the time an archaeological origin.
    Since these data is often not complete or disturbed, I adjust the information on request to make good reconstructions.
    (I have *.stl, *.obj etc CT scan data, however, my protocol is that this data cannot be shared)
    If you are interested to share knowledge, maybe you can send me a personal message? This, because I did not get a notification of your reply, I am sorry I let you wait.

  6. Like
    Dr. Mike reacted to Andras Lasso in Converting Ultrasound Files   
    We have added an extension to streamline the process of loading images of unknown file format. We also added a video tutorial for loading Samsung .mvl files: https://discourse.slicer.org/t/new-extension-rawimageguess-for-loading-of-images-from-unrecognized-file-format/9219.
  7. Like
    Dr. Mike reacted to kopachini in Are you attending RSNA 2019?   
    Unfortunately, I won't attend RSNA meeting this year
  8. Like
    Dr. Mike reacted to ebaumel in Are you attending RSNA 2019?   
    Hi Mike!
    It would be great to meet up again at RSNA. I'm arriving in Chicago on Tuesday - leaving Saturday am.
    Eric Baumel
  9. Like
    Dr. Mike got a reaction from Allen in Got a cool project? Lets us know for our newsletter.   
    Are you working on a cool 3D printing project? If so, let us know and we might feature you and your work in our newsletter. Send a message to me and let me know about what you are doing.
  10. Like
    Dr. Mike got a reaction from Angel Sosa in Are you attending RSNA 2019?   
    I will be attending RSNA 2019 in Chicago Illinois this December. Is anybody else in the embodi3D community attending? RSNA is the largest radiology meeting in the world, with over 50k attendees. If you are attending the conference, maybe we can connect to discuss 3D printing? Leave a note here if you will be there.
    Dr. Mike
  11. Like
    Dr. Mike got a reaction from David Axelrad in Dicom to STL   
    Check out some of valchanov's work. It might be useful to you.
  12. Like
    Dr. Mike got a reaction from Angel Sosa in Got a cool project? Lets us know for our newsletter.   
    Are you working on a cool 3D printing project? If so, let us know and we might feature you and your work in our newsletter. Send a message to me and let me know about what you are doing.
  13. Like
    Dr. Mike got a reaction from Soomin Lee in Got a cool project? Lets us know for our newsletter.   
    Are you working on a cool 3D printing project? If so, let us know and we might feature you and your work in our newsletter. Send a message to me and let me know about what you are doing.
  14. Like
    Dr. Mike got a reaction from kopachini in Got a cool project? Lets us know for our newsletter.   
    Are you working on a cool 3D printing project? If so, let us know and we might feature you and your work in our newsletter. Send a message to me and let me know about what you are doing.
  15. Like
    Dr. Mike reacted to valchanov in Postprocessing 3D prints   
    I was thinking the same, until I found the Silk PLA. It's a composite - 85% PLA, 15% Polyester and it's dirt cheap. The advantages are:
    1. In contrast to the natural PLA, the Silk one doesn't warp or deform during the cooling (or at least the deformation is minimal).
    2. It prints really well. You can make the impossible possible with this material.
    3. It looks amazing. The layer lines are almost invisible, the silk finishing is appealing, the colors are vivid.
    4. The supports falls easily. You just have to pull them and they are done. Tried this on a heart, brain and aorta models. You don't even need increased retraction for this.
    5. The stringing is minimal. No more "hairs".
    6. It's cheap.
    7. Because of those characteristics, this is material of choice for models with accurate morphological measurements. I'm using mostly this material, when I want to have an accurate model.
    So, check the local store for this material and try it yourself. You can thank me latter.

    P.S. For best results, print it at 200C.
  16. Like
    Dr. Mike got a reaction from Angel Sosa in Full size Thorax 3D print   
    A quarter is shown at the bottom for scale.
  17. Like
    Dr. Mike reacted to valchanov in Medical 3D printing 101   
    Single versus multiple segmentation - Back and forth technique

    There are many challenging cases, in which the single segmentation is not enough. The paranasal sinuses and the congenital heart defects are notable examples. My usual workflow was to segment whatever I can as good as it's possible, to clean the unnecessary structures and the artefacts, to export the segmentation as stl 3d model and then to "CAD my way around".  This is solid philosophy for simple, uncomplicated models, but for complex structures with a lot of small details and requirement from the client for the highest quality possible, this is just not good enough, especially for a professional anatomist like myself. Then I started to exploit the simple fact, that you're actually able to export the model as stl, to model it with your CAD software and then to reimport it back and convert it into label map again. I called this "back and forth technique". You can model the finest details on your model and then you can continue the segmentation right where you need it, catching even the slightest details of the morphology of the targeted structure. This technique, combined with my expertise, gives me the ability to produce the best possible details on some of the most challenging cases, including nasal cavity, heart valves, brain models etc. etc.
    To use this technique, just import the stl file, convert it into a label map (for 3D slicer -  segmentation module/ export/import models and label maps). 

    The main advantages of this technique are:
    1. You can combine the segmentation with the most advanced CAD functions of your favorite software. Two highly specialized programs are better than one "Jack of all trades" (cough cough Mimics cough cough)
    2. Advanced artefact removing.
    3. Advanced small detail segmentation and modelling.
    4. Combined with several markers (separate segmentations, several voxels in size) on the nearby anthropometric points, this technique increases the accuracy of the final product significantly. Without points of origin, the geometry of your model will go to hell, if you're not especially careful (yes, I'm talking about the 3D brushes in Slicer).
    5. You can easily compare the label map with the 3d model, converted back. Every deviation, produced during the CAD operations will be visible like a big, shining dot, which you can easily see and correct. This is one of the strongest quality control techniques.
    6. You can create advanced masks with all the geometrical forms you can possibly imagine, which you can use for advanced detail segmentation. Those masks will be linked with the spatial coordinates of the targeted structures - the stl file preserves the exact coordinates of every voxel, which was segmented.
    7. You can go back and forth multiple times, as many as you like.
    8. This technique is more powerful than the best AI, developed by now. It combines the best from the digital technologies with the prowess of the human visual cortex (the best video card up to date).

    The main disadvantages are:
    1. It's time consuming.
    2. It produces A LOT of junk files.
    3. Advanced expertise is needed for this technique. This is not some "prank modelling", but an actual morphological work. A specialized education and practical experience in the human anatomy, pathology and radiology will give you the best results, which this technique can offer.
     4. You need highly developed visual cortex for this technique (dominant visual sense). This technique is not for the linguistic, spatial-motor, olphactory etc. types of brains. Recent studies confirms, that a part of the population have genetically determined bigger, more advanced visual cortex (The human connectome project, Prof. David Van Essen, Washington University in Saint Louis). Such individuals become really successful cinematographers, designers, photographers and medical imaging specialists. The same is true for all the other senses, but right now we're talking about visual modality and 3D intellect (I'm sorry, dear linguists, musicians, craftsmen and tasters). It's not a coincidence that I have so many visual artists in my family (which makes me the medical black sheep). But if you don't have this kind of brain, you can still use the technique for quality control and precise mask generation. Just let the treshould module or the AI to do the job for you in the coordinates, in which you want (You should really start using the Segment Editor module in Slicer 3D).
    5. You really need to love your work, if you're using this technique. For the usual 3D modelling you don't need so many details in your model and to "CAD your way around" is enough for the task.
    6. You should use only stl files. For some reason, the obj format can't preserve the spatial geometry as good as the stl format. Maybe because the stl is just a simple map of vertex coordinates and the obj contains much more sophisticated data. The simple, the better.

    On the picture - comparison of the semilunar valves, made by treshould segmentation at 250-450 Hounsfield units (in green) and modelled and reimported model (in red). 

  18. Like
    Dr. Mike reacted to valchanov in Medical 3D printing 101   
    This topic is for medical 3d printing tips and tricks for the newbies. I'm starting with the bones, you can add whatever you can share.

    The main advantage of the orthopedical presurgical 3d printed models is the possibility to create an accurate model, which can be used for metal osteosynthesis premodelling - the surgeons can prepare (bend, twist, accommodate) the implants prior the operation. After a sterilisation (autoclaving, UV-light, gamma-ray etc etc), those implants can be used in the planned surgery, which will decrease the overall surgery time (in some cases with more than an hour) with all it's advantages, including a dramatic decreasing of the complication rates, the X-ray exposure for the patient and for the surgeons,  the cost and the recovery rates etc etc. For this purpose, you need a smooth bone model, with clearly recognizable and realistic landmarks, realistic measurements and physical properties, close to the real bone. Traditionally, the orthopedical surgeons in my institution used polystyrene models, made by hand, now they have access to 3d printed models and they are better in any way. Here are some tips how to print that thing. 
    1. Method - FDM. The bone models are the easiest and the most forgiving to print. You can make them with literally every printer you can find. FDM is a strong option here and, in my opinion, the best method on choice.
    2. Matherial - PLA - it's cheap, it's easy to print, it's the bread and butter for the bone printing. Cool extruding temperature (195-200C) decrease the stringing and increases the details in the models.
    3. Layer heigh - 0,150mm. This is the best compromise between the print time, the quality and the usability of the models.
    3. Perimeters (shell thickness) - 4 perimeters. One perimeter means one string of 3d printed material. It's width depends on the nozzle diameter and the layer thickness. For Prusa MK3 with 0,4mm nozzle 1 perimeter is ~0,4mm. To achieve a realistic cortical bone, use 4 perimeters (1,7mm). The surgeons loves to cut stuff, including the models, in some cases I have to print several models for training purposes. 4 perimeters PLA feels like a real bone.
    4. Infill - 15% 3d infill (gyroid, cuboid or 3d honey comb). The gyroid is the best - it looks and feels like a spongy bone. It's important to provide a realistic tactile sensation for the surgeons, especially the trainees. They have to be able to feel the moment, when they pass the cortical bone and rush into the spongiosa.
    5. Color - different colors for every fracture fragment. If the model is combined with a 3D visualization, which colors corresponds with the colors of the 3d print, this will make the premodelling work much easier for the surgeons. Also, it looks professional and appealing. 
    6. Postprocessing - a little sanding and a touch of a acrylic varnish will make the model much better.
    7. Support material - every slicer software can generate support, based on the angle between the building platform and the Z axis of the model. You can control this in details with support blockers and support enforcers, which for the bones is not necessary, but it's crucial for the vessels and the heart.
    Conclusions - the bone models are easy to make, they look marvelous and can really change the outcome of every orthopedical surgery.

  19. Like
    Dr. Mike got a reaction from Angel Sosa in Size of the 3D print vs Actual size   
    There shouldn't be. Just know that the unit of measurement is in millimeters. If you import the STL file into printer software and specify that the unit of measurement is cm, inches, or feet, your model will be HUGE.
    Hope this helps.
  20. Like
    Dr. Mike reacted to valchanov in Postprocessing 3D prints   
    Every Slicer software have automatic support function. Just click it and it will generate the right amount of support you need.
    For bone models the important question is - are your fellow surgeons planning to cut the model or not. It will be a shame, if they break their instruments into your model...
    For metal implant premodelling prior the operation, you need smooth bones with high resolution details. In my experience, 0,150mm layer thickness, with 4 perimeters (1,7mm shell thickness with 0,4mm nozzle), 15% gyroid or cuboid infill, a bit colder extrusion temperature (200C for PLA) is perfect. Your fellow surgeons can bend the metalic osteosynthesis implants on the model into their optimal shape, can sterilise them and this whole operation will decrease the surgery time with 1 hour. This is a big difference for the outcome of the operation, the recovery time, the complications ect. ect.
    If you want to print fracture fragments, make them in different colors. Then you can make 3D visualization with the corresponding colors. The model will look marvelous and you'll become the surgeon's best buddy. They will love you, they will cheer you and they will give you a lot of money for that.
    If you need specific information, please tell us - printer model, slicer software, material on choice. I can give you more specific information, if you do that.
  21. Like
    Dr. Mike reacted to Angel Sosa in Size of the 3D print vs Actual size   
    You can check this tutorial https://www.embodi3d.com/democratiz3d-user-manual/#Quality
  22. Like
    Dr. Mike got a reaction from Angel Sosa in Survey on the dissemination of 3D models of human skeletal remains   
    Speaking of sharing anthropology files online, embodi3D has a dedicated section in the file library for anthropological files. But, it hasn't been active at all. Do you have any ideas for how we can get better sharing in this field? We'd like to help promote 3D printing in anthropology as well as medicine.

    Thanks in advance,
    Dr. Mike
  23. Like
    Dr. Mike reacted to Flaviu in Comparing FDM multi material options: Prusa MMU2 and Palette 2+   
    First of all, a lot of people in the "professional world" are using Ultimakers. And the Palette 2 is still not working with 2.85 filaments (and probably never will?)
    The last few months I came across a new scenario for multi material printing. It is mixing PLA with PETG for supports. PLA and PETG don't bond to each other. So you can print your part with PLA and supports with PETG (or vice versa) and set the contact z distance to 0(!). It works very well. Supports are coming off easy and the interface layers look as good as if you were using soluble supports. Since you have to keep soluble filament in dry conditions it is much easier (and cheaper) to use PETG instead. 
    Setting up the Palette is very easy. Mosaic has some videos one can watch like this one https://www.youtube.com/watch?v=uqbMw_M07GM (and the two follow up ones).
    As for my experience. The combination Prusa MK3 + Palette 2 is probably one of the most used one in the community and works very reliable (of course there is no 100% guarantee but lets say 98,5% of the time 😉) . And I always use and recommend Prusas. 
    Also I would recommend using this post processing tool for PrusaSlicer 2.0: https://github.com/tomvandeneede/p2pp for an Prusa+Palette combination. 
    I would also still strongly recommend the already mentioned DIY canvas hub guide. There is already an Octoprint beta version out for the new Raspberry 4 so chances are the guide might work with the new Raspberry 4. But I haven't tested it.
  24. Like
    Dr. Mike reacted to valchanov in 3D Printing My Skull   

    I'll try to walk you through this:
    1. First of all, install a proper dicom viewer. You can install Radiant for free and activate it with trial license, which you can renew unlimited times.
    2. Open the program, drag and drop the whole DICOM set and observe the series. There is a good volume rendering, multiplanar reconstruction and all the measurement tools you can possibly want. So, choose the series, which suits you best - probably the one with the thinnest slides.
    3. Check for pictures in the series, which are not supposed to be there. Sometimes some lazy radiologists are exporting the histiogram directly in the series, which disturbs the sequence algorithm of the medical informatics program, which you'll use later.
    4. Export the set - export-"current series"-"dicom". Choose a folder and hit "export".
    5. Load the set in 3D Slicer and use dr. Mike's basic tutorial. It's still one of the best tutorials. I myself prefer the segmentation editor module, but the basic editor is still a powerful tool. Make sure to remove "single file", when you're loading the set!
    6. If the CT scan is with 2mm thickness or better, you'll have your skull in no time, ready for 3d printing.

    I hope this will help. Thumbs up.
  25. Like
    Dr. Mike reacted to valchanov in Entry/Minimal Use 3d Printer recommendation?   
    If you want to scan people for fun, you can  use your cell phone for photogrammetry with free software. Then you can put the heads on different bodies and to print them. Something like this:

    For this purpose you can use every 3d printer up to 2000$. I myself prefer my original Prusa MK3, because I'm not an engineer and I prefer something to do all the printing stuff for me. Here is the result:

    When we're talking about medical 3d printing, we're talking about a whole different topic. The medical models have to be very precise and there is an industrial standards about it. For example, my models have 0,5mm deviation from the original body part at 95% confidence interval. I had a presentation at an morphology symposium about my favorite Lusoria model lately and now I have a lot of orders from the local hospitals, because of the standard, which I can achieve. For medical modeling you have to be an expert in all the morphological specialties (Anatomy, Pathology, Radiology) with some serious clinical background. To reach this level, you need:
    1. Medical education.
    2. A lot of treated patients, most of which have to stay alive after your job. The death patients are literally skeletons in the closet.
    3. Some background in the basic dissection techniques, both the pathological and the anatomical ones.
    4. The surgery training is a plus.
    5. Some gaming experience or experience with CAD software. The computer games are like bodybuilding for the visual cortex.
    6. 1+ years of hard work, everyday modeling, studying, drawing, dissections, consultations with the experts in the field, a lot of tears and some joy.
    THEN you can do medical modeling, something like this.
    I started to model, when I was an anatomy assistant professor, with 12 years of experience as an emergency internal physician. I had the chance to find this website with all it resources, tutorials and the awesome support from the administrators and after 1 year of really hard work, I became a professional, (one of the best in my region, in a matter of fact). But still, my biggest nightmare is that, because of my mistakes during the preoperative modeling, a patient will die. So - are we really talking about medical modeling or you just want to do some fun with your client's CT scans?
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