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Found 70 results

  1. Version 1.0.0

    4 downloads

    Mixoma02 - stl file processed Left atrium mixoma, CTA, scan, contrast, chest, lung, heart, great vessels, axial, ribs, dorsal, spine, bone, muscle, dicom, stl, printable, aorta, descending, ascending, 3d model, atrium, ventricle, mixoma, tumor, cardiovascular, muscles, intercostal, serratus, bronchus This file was created with democratiz3D. Automatically create 3D printable models from CT scans. Learn more.

    Free

  2. Version 1.0.0

    31 downloads

    Left atrium mixoma, CTA, scan, contrast, chest, lung, heart, great vessels, axial, ribs, dorsal, spine, bone, muscle, dicom, stl, printable, aorta, descending, ascending, 3d model, atrium, ventricle, mixoma, tumor, cardiovascular

    Free

  3. Version 1.0.0

    27 downloads

    porcelain aorta - stl file processed This file was created with democratiz3D. Automatically create 3D printable models from CT scans. Learn more. porcelain aorta, ct with contrast, scan, dicom, axial, thorax, heart, aorta, descending, ascending, porcelain, arch, bronchus, lung, pulmonary, trunk, arteries, great, vessels, calcification, ribs, chest Calcification of the thoracic aorta is often associated with valvular and coronary calcification, reflecting an underlying atherosclerotic process. It has been found to be associated with an increased rate of mortality and cardiovascular disease. Porcelain aorta (PA) is extensive calcification of the ascending aorta or aortic arch that can be completely or near completely circumferential. This entity is rare in the general population, but it has an increasing incidence in older patients and in patients with coronary artery disease (CAD) or aortic stenosis (AS). The clinical relevance is based on the fact that it can complicate surgical aortic valve replacement (SAVR) for the treatment of severe AS by preventing safe access via the ascending aorta. PA is associated with increased morbidity and mortality, especially as a result of increased perioperative stroke risk. Recently, transcatheter aortic valve replacement (TAVR) has emerged as a less invasive and feasible treatment option in patients at high risk for conventional SAVR. In some series, ≈20% (5%–33%) of patients undergoing TAVR were diagnosed with PA. Inconsistencies in the definition and the use of different diagnostic modalities contribute to this wide range of PA prevalence. We reviewed the available published data to seek a consistent, clinically relevant definition based on contemporary imaging, a firm understanding of the pathogenesis and associations, and the clinical implications of this disease entity. Abramowitz, Y., Jilaihawi, H., Chakravarty, T., Mack, M. J., & Makkar, R. R. (2015). Porcelain aorta: a comprehensive review. Circulation, 131(9), 827-836.

    Free

  4. Version 1.0.0

    5 downloads

    test - stl file processed This file was created with democratiz3D. Automatically create 3D printable models from CT scans. Learn more. CTA, vessels, artery, kidney, bone, 3dmodel, stl, lumbar, spine, ribs, abdominal aorta, iliac vessels, renal arteries, celiac artery, iliac

    Free

  5. Version 1.0.0

    149 downloads

    Cardiac CTA showing the left heart. This was derived from a file originally shared by Liam.

    Free

  6. Version 1.0.0

    23 downloads

    This 3D printable STL file contains a model of the heart and coronary arteries was derived from a medical CT scan. The left main coronary artery has an abnormal (aberrant) origin, arising from the main pulmonary artery trunk. This model was created using the democratiz3D 3D model creation service toutatix

    $4.99

  7. This is a time of rapid growth in medical 3D printing. The technology allows us to take an individual patient’s scan information and create physical models, which can be used in any number of clinical applications. The industry standard DICOM image files from CT and MRI scanners can be converted into 3D files, such as STL (for stereolithography) files. These digital models can then be uploaded to a 3D printing service bureau or printed on one of the currently available professional grade printers.The democratization of desktop 3D printers, however, now allows almost anyone with a serious interest in the technology to print models in their own office/workshop. These can be used for educational purposes and for prototyping, and represent an excellent entrée into the technology. Recently, I started printing 3D models of some of my own patient’s scans using a consumer grade desktop printer. The patient’s CTs were acquired on our Toshiba Aquillion 64 Slice CT scanner using our standard acquisition protocols. The DICOM volume data was then burned to a CD for processing. For my initial test prints, I used the Materialise Mimics and 3-matic software under their 30-day free trial period. The images from the appropriate volume were imported into the Mimics software. Thresholding is then performed to isolate the tissues in question, based on its Hounsfield units, a measurement of X-ray density. The particular anatomy of interest is then selected using “region growing” tools and a 3D model is generated. The model is then “wrapped”, to account for the individual CT slices, and to smooth any gaps in the 3D mesh. Choosing the degree of wrapping is where experience comes into play. Too little wrapping can cause gaps to be present on your final models. Too much, and detail can be lost. The 3D model is then exported into the 3-matic program for “local smoothing” of the model. The digital model is then hollowed, depending on the structure and its use. You then export it as a binary STL file. In all of the steps above, clinical knowledge of the anatomy is extremely helpful in creating the most accurate models possible. Understanding how the models will be used informs your decisions in their creation. The STL file is then imported into a slicing software to create the G-code files that instruct the printer how to actually create the physical model. I used the open source Cura software for the generation of the G-code for the printer. An image of the 3D model is seen superimposed in a representation of the build plate of the particular printer, in my case the Ultimaker 2 (Ultimaker B.V.). The model can be rotated to optimize the printing process. The highest resolution of current 3D prints from fused filament printers is in the z-direction: from the bottom on the build plate to the top of the object. The degree of overhang must also be taken into account. Since the filament cannot be deposited in thin air, the slicing software creates a scaffold to support the overhanging material. Keep in mind; this support structure must be physically removed in post-processing. The slicing software also creates a thin base layer of the material (called a brim or raft) that is deposited around the object to facilitate print adherence to the print platform. The generated G-code is saved to an SD card, which is then placed into the printer. In some cases, the files can be transferred wirelessly. I used 2.85 mm PLA filament to create the printed models. PLA is polylactic acid, a biodegradable material derived from cornstarch. PLA based material has been used in orthopedics for sutures, controlled release systems, scaffolding for cartilage regeneration, and fixation screws. The print time takes several hours, depending on the size and complexity of the model, as well as the amount of support structure used. Through trial and error, I found that careful positioning of the 3D model on the virtual build plate can potentially shorten the length of printing time. A full-scale hollow abdominal aortic aneurysm model took about 9 hours to print, while a full-scale scapula took 13 hours. A life-size pediatric skull will take approximately 23 hours to print! The use of 3D printing in medicine presents enormous potential. Exponential development of many new applications will occur if researchers, students and clinicians have access to small-scale 3D printers for prototyping new devices and procedures. The future is only limited by the imagination. A method of reimbursement wouldn’t hurt either. I would like to thank Frank Rybicki, MD, Professor and Chair of Radiology, University of Ottawa, and his team from the Applied Imaging Science Laboratory at Brigham and Women's Hospital for their great 3D Printing Hands-on courses at RSNA 2014. Copyright ©2015 Eric M. Baumel, MD
  8. From the album: ebaumel Blog images

    Finished 3D printed model of a CT Angiogram of an abdominal aortic aneurysm produced on an Ultimaker 2 desktop printer.

    © Copyright ©2015 Eric M. Baumel, MD

  9. From the album: ebaumel Blog images

    Radiograph of a 3D printed model of a CT Angiogram of an abdominal aortic aneurysm.

    © Copyright ©2015 Eric M. Baumel, MD

  10. From the album: ebaumel Blog images

    A wrapped 3D model of a CTA of an abdominal aortic aneurysm using the Materialise Mimics software.

    © Copyright ©2015 Eric M. Baumel, MD

  11. From the album: ebaumel Blog images

    Region growing of the contrast in an abdominal aorta to create a 3D model using the Materialise Mimics software.

    © Copyright ©2015 Eric M. Baumel, MD

  12. From the album: ebaumel Blog images

    A CT angiogram of an abdominal aortic aneurysm opened in the Materialise Mimics software to create a 3D model.

    © Copyright ©2015 Eric M. Baumel, MD

  13. From the album: ebaumel Blog images

    A 3D model of a CTA of an abdominal aortic aneurysm created using the Materialise Mimics software.

    © Copyright ©2015 Eric M. Baumel, MD

  14. ebaumel

    Thresholding

    From the album: ebaumel Blog images

    Thresholding a CTA of an abdominal aortic aneurysm in the Materialise Mimics software to select the contrast in the aorta by CT density (in Hounsfield units).

    © Copyright ©2015 Eric M. Baumel, MD

  15. From the album: ebaumel Blog images

    A CTA of an abdominal aortic aneurysm using the Materialise Mimics software to create a 3D model.

    © Copyright ©2015 Eric M. Baumel, MD

  16. From the album: ebaumel Blog images

    The G-code file of a 3D model of an CT angiogram of an abdominal aortic aneurysm in the Cura software, showing the support structure for a 3D print.

    © Copyright ©2015 Eric M. Baumel, MD

  17. From the album: ebaumel Blog images

    The STL file of a 3D model of an CT angiogram of an abdominal aortic aneurysm in the Cura software. A G-code file will be produced for printing on a 3D printer.

    © Copyright ©2015 Eric M. Baumel, MD

  18. From the album: ebaumel Blog images

    An axial image from a CT angiogram of a patient with an abdominal aortic aneurysm. This is being used to generate a 3D printed model.

    © Copyright ©2015 Eric M. Baumel, MD

  19. From the album: ebaumel Blog images

    3D printing of a CT angiogram model of an abdominal aortic aneurysm on an Ultimaker 2 desktop 3D printer in PLA.

    © Copyright ©2015 Eric M. Baumel, MD

  20. From the album: ebaumel Blog images

    3D printing of a CT angiogram model of an abdominal aortic aneurysm on an Ultimaker 2 desktop 3D printer in PLA. The support structure and printing "brim" are visible.

    © Copyright ©2015 Eric M. Baumel, MD

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