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Showing most liked content since 05/23/2018 in all areas

  1. 3 points
    Andras Lasso

    Lumen of vessel in 3D Slicer

    For anybody who stumbles upon this thread: we've added "Hollow" effect to 3D Slicer's new Segment Editor module. It has the option of creating vessel wall inside, outside, or around the surface. The method uses labelmap representation for internal computation therefore it is very robust (there are no degenerate triangles or intersecting surfaces in the generated mesh), you may just need to set the resolution of the segmentation if you want to create models of very thin walls.. Here is a short demo video about how to use it: We constantly improve 3D Slicer's segmentation capabilities and 3D printing is one of the driving applications, so any feedback or feature requests are welcome.
  2. 2 points
    kopachini

    Vessel reconstructions

    Dear Jee Lee, if CTs are done in arterial phase you will hardly be able to show venous system by automatic segmentation, maybe if a really late phase more porto-venous phase is done you will have some more success. I would suggest that if you have arterial phase only, try automatic segmentation for arteries and try manual segmentation for veins. Or obtain porto-venous phase CT study.
  3. 2 points
    Hello Kopachini, I have some news for you. While the new GE machines have the facility to export images form DICOM files in STL format (either as a stand alone model or a relief model), they have unbundled the functionality so that the same functionality can be available using their stand alone software called 4D View where older GE models do not have this functionality built in. This allows you to access a DICOM file and export the image as a STL file. In theory you can download this software for the GE website, but it is rarely successful. And you need to be a member of the Voulson club. The only way I have found is to make friends with an owner of a GE system and ask them to request a demo version of the software. This is what I did. My (small) company 3D Industries is now working on this aspect as one of areas of activity with a view to commercialization. Let me know what you are doing and we may have a common interest. Best regards Peter
  4. 1 point
    Andras Lasso

    Heart Segmentation

    You might find useful this video tutorial about how to segment whole heart using 3D Slicer's Segment editor: You can enable close captioning, as the audio is quite difficult to hear.
  5. 1 point
    Dr. Mike

    Holes in bone models with democratiz3D

    I'd like to elaborate on this topic a bit, as I recently had another member inquire about this issue. The member was creating a model from a CT scan of the clavicles. As you can see, there are holes in the medial (midline) ends of both clavicles. What is causing this? Is it a problem with democratiz3D? How can it be fixed? The issue lies with the patient's anatomy and the quality of the original CT scan. In the human body there are areas where bones are naturally very thin. Sometimes, the bone surface (cortex) can be paper thin. Also, some patients who have conditions like osteoporosis may have very little calcium in their bones. Issues like this make it very hard for the CT scanner to detect the bone wall, as you can see from the image below which shows the area on the left clavicle that has a hole in the final model (red arrow). The problem isn't with democratiz3D, but with the quality of the CT scan or with the patient having thin bones (how dare they!). democratiz3D is actually creating the model exactly as it appears on the CT, its just that the CT has holes we don't want! So, what can be done? If you encounter this problem you have two options. 1) Manually fix the holes in the model with a mesh editor like Meshmixer, or 2) decrease the threshold value in democratiz3D and re-process the scan. Decreasing the threshold tells the system to capture more voxels in your model, potentially capturing more thin or osteoporotic bone. But, be careful. If you reduce the threshold too much (less than 100), you run the risk of starting to capture muscle, organs, and vessels in your bone model. If you are not sure what threshold to use, you can experiment by running your scan through democratiz3D using different thresholds. To save time, I suggest you do this on low or medium quality setting. When you find a threshold that works, you can generate your final model using a higher (and more time consuming) quality setting, like High or Ultra. If you are familiar with mesh editing software, that is probably the fastest way to correct this problem. Just delete the edge of the hole, fill it in with a new face, and run a quick smooth operation on the area. It's a 1 minute fix if you know the keyboard shortcuts. I hope this tip helps. Dr. Mike
  6. 1 point
    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.
  7. 1 point
    Dear Dr. Mike: I'm really excited to see the profile of Embodi3D. I commented a few days ago, I got my hands on this tutorial: http://www.makermex.blogspot.com.ar/#!http://makermex.blogspot.com/2015/03/como-convertir-una-tomografia-en.html I honestly was not sure Blender off a possible tool for the development of workflow. But to see what you have accomplished on the page, I put very, very happy. I'm using Blender for about 8 years (www.infografiaeinteriorismo.blogspot.com) a while ago and I'm trying to get 3D printed pieces from information obtained from a CT scanner does. My idea of ​​workflow is: DICOM files tomograph. SLICE 3D processing. Exported in STL format. Import Blender. Clean. 3D printing. I hope and I do urge you to help me if in the way of stumble learning obstacles. Of course, I greatly appreciate your time spent as fantastic video tutorials (I'm looking at right now). Greetings Carlos
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