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CT scan resolution?

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I have a CT scan that I would like to print.  While looking at the data, I found that the scan isn't uniformly sampled in all directions.

The DICOM image axes - call it X-Y - are high resolution - about 800x1000. The number of slices in Z for each is a little over 100, always giving a slice thickness of 3mm (compared to 0.5mm for the other axes).


Anyone know why the sampling isn't uniform?  The non-uniformity results in stair-stepping and missing detail (see pic).


I suspect the data was decimated for one of a few reasons: (1) to take less storage overall, (2) to make it easier for the Dr to review (100 images vs 1000),  (3) to make it fit on a CDROM or (4) to reduce the noise in any particular slice.  The full data probably exists somewhere, but I don't know what to ask for.  The radiology dept just gave me a blank stare when I asked for the high-resolution version.


FWIW, the machine is a Philips ICT-256.




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