open-discussion > Need help
Aug 31, 2011  06:08 PM | Ramesh Babu MG
Need help

Dear

I am learning image processing by using SPM8 as prescribed in VBM manual. I Have ADHD data set (n=48), consists of developing control n=23(group-A) and ADHD (including subgroups) n=25 (group-B). After preprocessing, I have done 2 sample T test as prescribed in VBM manual. I defined t contrat 1 -1 for groupA > group-B. I got blank imgages.  Then i defined t-contrst -1 1 for groupB > GroupA. First i did this statistics test by considering age as coveriate and then without age. I Found differences in the gray matter regions for both (With age and without age covariate). Which one i should consider, Whether with age or without age?

I would like to know how to proceed further. Which p-valuve i should consider? cluster level p-valuve or peak level p-valuve? And what is the difference between this two p-valuves?

How to create rendered image which should depict the gray matter volume changes?

How to get images with colour bar which indicates t valuves?

My questions may be very basic and it will be very helpful for me if any one give their openion and sugession.

(please see the attached images. See the
another image in the reply message below, i could not able to attach
more than one image with this message).

Many thanks

Ramesh
Attachment: ADHD -CTRL.png
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Need help
 Ramesh Babu MG Aug 31, 2011
Mark Jason Nov 11, 2011
Ramesh Babu MG Nov 15, 2011
Ged Ridgway Sep 1, 2011
Ramesh Babu MG Sep 3, 2011
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Ged Ridgway Sep 5, 2011
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Cartik Sharma Aug 31, 2011
Ramesh Babu MG Sep 1, 2011
Cartik Sharma Sep 1, 2011
Ramesh Babu MG Aug 31, 2011