Dear Marco:
SPM96 and SPM99 both offer similar rendering algorithms allowing the
illustrative (though as you note slightly inaccurate) display of
activations on a surface rendering of the brain. I'm not aware of any
algorithm in spm99, which allows coloring the display based on activation
depth but perhaps this is a hidden feature. The depth of the display is
about 8 mm I believe and is adjustable, but I cannot recall the value to
change. John Ashburner wll know.
The bottom line though is it's the anatomy that counts. Why not include a
slice or two with your rendering to show the actual location of
activations? Wouldn't this obviate concerns about fancy renderings?
Good luck,
Darren
At 01:00 PM 2/20/01 +0000, you wrote:
>Dear SPMers,
>upon request of a referee, we are reviewing a PET experiment analysed
>with SPM96. The referee requires that the images included in our paper
>using the Rendering procedure in SPM96 be modified by eliminating
>the biases implicit in the SPM96 rendering procedure itself.
>I suppose he refers to the fact that the SPM96 rendering procedure displays
>"deep" voxels on the surface of the brain.
>So, here is my question. Does anybody have a modified rendering algorithm,
>such that, either the image displays are split according to the depth of
>activation
>in the brain tissue, or the thickness of brain tissue rendered on the
>surface can be interactively specified?
>Thank you a lot for any help of feedback!
>
>Marco
>
>Marco Tettamanti
>Istituto Scientifico San Raffaele
>Reparto Medicina Nucleare
>Via Olgettina 60
>I-20132 Milano
>Italy
>Tel. 0039 - 02 - 26 42 34 60
>Fax: 0039 - 02 - 21 71 75 58
>email: <mailto:[log in to unmask]>[log in to unmask]
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Darren R. Gitelman, M.D.
Cognitive Neurology and Alzheimer¹s Disease Center
E-mail: [log in to unmask]
WWW: http://www.brain.northwestern.edus
Voice: (312) 908-9023
Fax: (312) 908-8789
Northwestern Univ., 320 E. Superior St., Searle 11-470, Chicago, IL 60611
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