RE: Right-left inversion

From: Angus Bond \(E-mail\) (afb8@alumni.cwru.edu)
Date: 04/10/2000 12:43:04

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Hello Elena,

Have you considered that your medical images may be using a different coordinate system than the volumizer bricks?

In standard axial (transverse) medical images, the images are presented as viewed from the feet. The pixel data is arranged in left-to-right rows (patient right-to-left), with the rows arranged top-to-bottom (patient anterior-to-posterior). If your slices are arranged bottom-to-top (patient inferior aspect to patient superior aspect), you will have a right-handed coordinate system. If your slices are arranged top-to-bottom (patient superior aspect to patient inferior aspect), you will have a left-handed coordinate system.

If the handedness of your data is the opposite of the handedness of the volumizer bricks, it will appear as if the data was swapped left-to-right.

Good luck!
Angus

--
Angus Bond
afb8@alumni.cwru.edu
bond@stereosgi.neur.cwru.edu
bond@modex.com
216 844-8963 office
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-----Original Message-----
From: owner-info-volumizer@corp.sgi.com
[mailto:owner-info-volumizer@corp.sgi.com]On Behalf Of Elena Boniotti
Sent: Thursday, April 06, 2000 06:22 AM
To: info-volumizer@corp.sgi.com
Subject: Right-left inversion
Hello,
I've run the demo "voglSimple" loading my medical volumes (.tiff) and I
realized that in all cases there is a right-left invertion on the
visualized data. For example the heart appears on the right side of the
chest. I think it is a brick sorting problem. Am I right? What can I do?
Thanks in advance!

• Next message: WR: "outlines in voiv examples"
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• In reply to: Elena Boniotti: "Right-left inversion"

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