valchanov

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valchanov last won the day on January 30 2017

valchanov had the most liked content!

About valchanov

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  • Birthday 06/22/1980

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  1. Version 1.0.0

    0 downloads

    An infant with proximal fracture of the tibia and external fixation. Source - Nukki BlastInjuri 1.0.0. Link in Sketchfab. Osteology, orthopedy, orthopedic, fracture, tibia, fibula, leg, external fixation, osteosynthesis, bone, 3d, model, .stl, printable, lower, limb, femur, condyles, lateral, medial

    $10.00

  2. Version 1.0.0

    0 downloads

    Talar fracture. Source - Hristo Hristov. Link in Sketchfab. Excellent model for orthopedic training - just print it in PLA and have some fun anatomy, orthopedic, orthopedy, bone, talus, calcanus, foot, training, osteology, naviculare, phalanx, cuboideum, cuneiform, tarsal, metatarsal, fracture, .stl, 3d, model, printable, lower, limb, ankle

    $30.00

  3. Version 1.0.0

    0 downloads

    This is my version of the Phenix CT dataset from the Osirix Dicom Library - an infant with Treacher-Collins syndrome and aplasia of the left zygomatic bone and maxilla after a reconstruction surgery with an autograft. I wanted to preserve the small details of the maxilla and the nasal cavity, so I segmented them manually. It took me a week. The spine is not done yet - I'm redoing it and I'll reupload the whole set in the following week. The model is 3D printable, but you'll need a multi-material extruder with soluble support for this purpose - PLA/PVA will be best (PLA/PVA is much better than ABS/HIPS in my opinion). I hope you'll enjoy it skull, face, 3d, model, printable, skull, skeleton, bone, ct, scan, maxilla, malformation, reconstruction, surgery, autograft, zygomatic, arch, fracture, craneotomy, stl, temporal, frontal, parietal, occipital, mandible, nasal, orbit, cervical, spine, clavicle, ribs, thorax, 3d, model, printable

    $30.00

  4. If you manage to find a good Z-stack (confocal microscopy dataset), you can use the following workflow to make a 3D model: 1. Use Fiji (an open-source software, extended version of ImageJ for scientific analysis) to convert .tiff slide to binary (Process/Binary/Make Binary). Then use the Dilate function to reduce the size (Process/Binary/Dilate) and crop a region of interest (Image/Crop). Those datasets are ridiculously large - 10 Gb and above (this is why I didn't uploaded such dataset here), so if you don't have a workstation, be prepared for a LONG wait. Finally, save the stack as a .tiff 2. Use 3D Slicer, Fiji, Osirix, Mimix or whatever segmentation software you prefer to create volume (Volume Rendering), to convert it to a label map and to export it as .stl. The workflow is the same as in the Dr. Mike's basic tutorial. Just don't forget to use the Curvature Anisotropic Diffusion module of Slicer or a similar denoising tool in the software you prefer. It will make your life A LOT easier - the confocal Z-stacks have a lot of noise and still you want to keep the curves of the objects. It's possible to segment a Z-stack with the Region Grow module of Slicer, but I didn't made it myself yet. 3. Finally, use Blender or Meshmixer to remove the artifacts. It's normal to have a lot of them. This topic is related to my PhD project, on which I'm working right now - "Bioprinting and morphological analysis of a 3D matrix for biosynthetic implants", so I'll post my results after I manage to add a syringe pump to my 3D printer and make it work...
  5. Snow leopard skull

    Version 1.0.0

    0 downloads

    A 3D model of a snow leopard skull. I made it from a CT scan, which is uploaded by George vd W on the site. The nasal cavity is a mess, so I'll fix the conchae in the following days and I'll reupload the result.

    $10.00

  6. There is a histological staining technique for bone tissue, which can be used with confocal microscope for detailed dataset of the haversian model, the lacunae, the canaliculae, the perivascular spaces - every detail you can possibly imagine. Then the dataset can be segmented into a 3D model with the same workflow, which is used for the CT datasets. The problem is that this technique is very demanding, expensive and potentially letal because of the chemical, which are used in the process. I made several models of pyramidal neurons from confocal datasets (here is one on sketchfab, I have another on embodi3d with the dendrite spikes on it) and it's not that bad - after some deconvolution you can segment the dataset with the automatic threshold segmentator or even with the grayscale model maker and you'll get a good model. Sadly, my department didn't received the funding for this technique and I don't have such dataset...
  7. Hand CT scan - stl file processed

    Well, to be honest - you should work more on the carpal bones and especially on the joints between them. Right now they are a solid mass, which can't be used for demonstration purposes. My advice - use the region growing segmentation module on Slicer 3D. Whit it you can seed the parts of your model and the joints between them, which after some surface modeling results in high quality, anatomy department level model without all the artifacts you have. You can watch this tutorial to see how it's used. Happy modeling
  8. Version 1.0.0

    3 downloads

    This is my latest version of my paranasal sinuses model with emphasis on the nasal cavity. Every cavity is connected and can be reached with endoscope as an otorhynolaryngological training model. The wall thickness is 0,6mm. For best results, use transparent material with water or oil soluble support. paranasal, sinuses, osteology, ethmoid, sinus, paranasal, septum, nasal, maxillary, turbinate, otorhynolaryngology, 3d, model, stl, frontal, sphenoid, facial

    $25.00

  9. Lumen of vessel in 3D Slicer

    For me, the best for blood vessels modeling is the UV sphere of Blender. It's relatively easy to create a good 3D model of the lumen of the vessel from a good angio CT. This is what the vascular surgeons and the morphologists wants - the lumen have to be as good as possible, especially if you want to add a water pump to the model later for stent design study or if you want to use sophisticated fluid dynamics simulator for some fancy pathophysiology study (there are some good open-source simulators btw). I tested Dr. Mike's script from the advanced ankle tutorial and I got excellent results. There are some really good features of this method: 1. You can have the EXACT offset from the lumen everywhere, the crossing meshes are not an issue anymore. If you use the hollow option from Meshmixer, you'll get a lumen with bad quality, smaller than the real one. For an anatomist this is unacceptable, 2. Every 3D printer have a minimum wall thickness, which in my case is 0,2 mm (one layer of material). The resulting model is too fragile and with too many extrusion errors. In practical perspective is crucial to control the thickness of the wall (the offset of the UV sphere). I made a lusoria model with wall thickness of 0.6mm, which means 3 layers of material per every section of the wall. The resulting print is stable, visually appealing and won't brake in the rude hands of my students. 3. It requires some surface modeling to remove the bridges between the vessel branches, but it is nothing Meshmixer can't handle. Instead of a sphere, you can build a shell of simple geometrical forms (tetraeders, cylinders etc ) around your vessel model and the bridges wont be an issue anymore. 4. You can make as many iterations as you want, 60 is the magic number for me. Just make sure to remesh the shell after the wraping. In conclusion - Dr. Mike, your script is GREAT. It will be excellent to add special tutorial about it.
  10. Version 1.0.0

    0 downloads

    Female pelvis and spine with massive osteophytes. CT scan, 0,6mm slides. Sketchfab anatomy, spine, pelvis, osteophytes, disc hernia, spondiloartrhosis, disc, ribs, hip, head, femur, stl, 3d, model, printable

    $20.00

  11. Massive skull defect

    Version 1.0.0

    0 downloads

    Iatrogenic skull defect following surgical excision due to severe maxillary osteomyelitis. CT scan, 5mm slices. Sketchfab The patient refused to make another scan, so I had to segment it manually from 5mm slices. The calvaria is made as a lid, so the model can be used as a candy jar... osteology, bone, skull, head, orbit, stl, 3d, model, printable, frontal, surgery, osteomyelitis, maxillary, calvaria, zygomatic, arch

    $15.00

  12. Intellectual property protection

    I shared one of my models with an acquaintance of mine, because he wanted to test his new Prusa 3D printer with it. Later he posted it on a website for selling. I approached the problem personally, he removed the model from the site and apologized to me, this is why I won't share details about the issue (he had to print some of my models for free, of course). Now all my models are watermarked and if I have such a case, I can contact the administrator instead, my name and my institution are inserted in the mesh itself.
  13. Intellectual property protection

    The protection of the intellectual property of the 3D models can be a serious issue for every 3D modeler. It sucks when your model is posted for selling at a webside without your consent with a juicy price and you're gaining NOTHING from it. Some 3D artists are adding watermarks to their models, which can be easily removed by an amateur with a free surface modelling program (Meshmixer, Meshlab etc.). But there is an easy solution for this injustice - an invisible watermark. On Watermark3D you can add such watermark, incorporated into the mesh of your 3D model itself, which is hard for removing and can be checked on the same website during an intellectual property dispute. For the removing of the watermark you have to remesh the whole model, which will decrease the overall quality of the model substantially. I hope that I'll spare you the pain, which I experienced recently. Enjoy
  14. Fancy skull and vertebrae

    Version 1.0.0

    0 downloads

    This is 3d model of a skull - my best skull so far. I made it from 0,7mm CT scan. This is the source model for my paranasal sinuses model. Sketchfab link. Thanks for the tutorials, Dr. Mike!

    $30.00

  15. Paranasal sinuses

    Version 1.1.0

    14 downloads

    The paranasal sinuses model for 3d printing. CT scan, 0,7mm slides, bone window. The model is without scaffolds and you should add some with your slicing software. Link to sketchfab: Paranasal sinuses frontal, sphenoidal, ethmoidal, skull, head, paranasal sinuses, anatomy, 3d , model, .stl, printable

    $25.00