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Johnny

CT scan and X-rays images not matching in size

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Dear 3D whisperers

 

I´m a vet and at the moment we are treating a cat that lost its rear paws for unknown circumstances.

We took a CT scan of its body and some X-rays too, the problem is that the mesh generated (right tibia and fibula) does not seem to be matching the size of the images of the X-rays, even though the difference is minimal, the mesh it is bigger and thicker as you can tell in the images provided.

 

Is this something normal?  Which one is more accurate, the X-ray or the CT scan mesh?

I used Slicer to generate the mesh from the DICOM files.

 

Kindest Regards

Johnny

 

 

Screenshot (26).png

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I think the bone model is OK. You can't compare x-ray to CT, as one is 2D and the other 3D. CT is more accurate. You may be encountering magnification effect with the x-ray if the plate was not completely parallel to the bone at the time of acquisition. Any structures closer to the x-ray tube will be magnified relative to those farther away. That's just x-ray physics. I'd put more weight on the CT results.

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Interestingly enough, I had an ,stl file obtained from a CT scan, then had it printed and it is 10-15 percent smaller haha! Why would that be?

I obtained the .stl using InVesalius.

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