Angus Bond (bond@stereosgi.neur.cwru.edu)
Thu, 14 Oct 1999 13:22:02 -0400 (EDT)
Hello Mark,
I do not have the answer you seek, but I can tell you that, if you
are emulating an endoscope, you can expect to see blurred and/or
aliased images.
The problem has to do with image resolution. CT and MR scans are
usually 512 pixels across a field-of-view of 240 mm and the slices
are usually 1 to 2 mm apart. That means that each voxel is about
0.5x0.5x1.0 mm at best. An endoscope usually has a field-of-view
of about 10 to 20 mm, so you will be looking at a field of about
40x40 voxels at best and 20x10 voxels at worst. I can guarantee
that the result will be blurred and/or aliased.
A good rendering system will produce an anti-aliased image so that
you get an understanding of what you are seeing. You may also be
able to get a crude surface rendering. The rendering system cannot
create data that was not in the original CT or MR scan, so the very
best it can do is approximate reality. Once you understand this,
you can find a rendering system that will give you a good
representation of the volume. For that, you will have to talk to
the other members of this mailing list.
Good luck!
Angus
-----------------------------------
Angus Bond
bond@stereosgi.neur.cwru.edu
bond@modex.com
+1 216 844-8963 lab/office
+1 440 834-1414 answering machine/fax
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