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Showing results for tags 'ct scan'.
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Digitally prepping a Pliocene gannet skull using machine learning
Doctor Mud posted a topic in Fossil Preparation
Hello everyone, I have quite a few projects going on and I'm going to be a bit more active on here to share things. Sorry I've been a bit quiet! I see there are a few threads on here about CT scanning, 3D printing and segmentation, but I thought I would add this one. I've been doing it for a few years, but just bit the bullet and bought a machine custom built to do this. I really think we should create a sub section of fossil preparation for CT scanning and segmentation? Resources are scattered around the internet and it would be great to document them all on here. I have lots to learn and I'd like to "upload" this knowledge here as I aquire it. E.g. Hardware set up, software, things like digitization tips and tricks (stylus pen and tablet vs mouse). The same sort of thing we have for physical prep on here: set-up, tools and techniques. Anyway. I just acquired a very powerful computer and I fired it up last night. I have a CT scan of a Pliocene gannet skull that was found last year that I've been sitting on. At least I think it is gannet. I am using imageJ to do the segmentation. Segmentation is just the process of telling the computer what is bone, what is rock and what is air. I don't have a photo of the concretion, but here is a 3D model above. It is about 10cm long. This is looking from above. Here is one of 760 slices from the CT scan of the skull. A vertical slice with the top of the skull at the top of the image. Pixel size is about 30 microns! Here is the view after ONE round of training the computer. I selected some areas of bone, some of rock and some of air. Then the computer thought about it, using 160 GB of ram (out of my total 192 GB) and the latest Intel chipset in a water-cooled CPU to classify every pixel as bone (red), rock (green) or air (purple). It does this for every of the 760 slices. This is a first pass. You can go back and train the computer further and correct it. It gets better with each round. Here is the first reconstruction of the skull. You can see there is still a bit of noise. I could get rid of that with a few more learning phases. A lot of loose pixels could be removed in rendering software such as Blender too. Hope you enjoyed this. I'll keep you posted as I improve the model. And I'd like to 3D print it at the end! -
Exceptional fossil preservation and evolution of the ray-finned fish brain. - Carboniferous - United Kingdom
Oxytropidoceras posted a topic in Fossil News
A 319-million-year-old brain has been discovered. It could be the oldest of its kind By Amarachi Orie, CNN, February 2, 2023 Scientists Discover 319-Million-Year-Old Fossilized Brain Amada Kooser, CNET, February 1, 2023 The paper is: Figueroa, R.T., Goodvin, D., Kolmann, M.A. et al. Exceptional fossil preservation and evolution of the rayfinned fish brain. Nature (2023). https://doi.org/10.1038/s41586-022-05666-1 Yours, Paul H.- 3 replies
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High resolution CT scanning of Tiktaalik skull shows it could still slide skull bones to create suction for feeding in water. https://scitechdaily.com/new-evidence-emerges-on-how-early-tetrapods-learned-to-live-and-eat-on-land/amp/
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- tiktaalik roseae
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A group of UK scientists reexamined a group of late stage Neanderthal teeth from the early 1900s with modern techniques such as CT scanning. They discovered a mix of new characteristics indicative of both modern Homo sapiens and Neanderthal, more evidence supporting a gradual absorption of Neanderthals into emerging modern human populations. Article Link Published Paper Link (Not free access)
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Article on new structural findings of Tiktaalik and other fish/tetrapod fins/feet https://m.phys.org/news/2019-12-fish-fins-evolved-transition.html