Re: [Marsbar-users] compatibility of anatomical ROIs across SPMversions?

[Hammers, A. <ale...@cs...>]

Dear Todd,

I would
- outline ROIs on native images in the future ;-)
- try the SPM2 Deformations toolbox to get your ROIs into "SPM2native" =
space; remember to use nearest neighbour interpolation
- re-normalise those "SPM2native" ROIs using the spatial deformations =
derived from the Unified Segmentation (SEGMENT button) in SPM5, again =
making sure to use nearest neighbour interpolation

It's possible that the two interpolations will make your ROIs a bit =
flayed at the edges - but if it already gets them into the proper place =
we can see about details later.

HTH,
Alexander

-----Original Message-----
From: mar...@li... =
[mailto:mar...@li...] On Behalf Of Todd =
Girard
Sent: 30 August 2007 04:56
To: mar...@li...
Subject: [Marsbar-users] compatibility of anatomical ROIs across =
SPMversions?

Dear Matthew and marsbar-users:

I have recently updated some old analyses from spm99 and getting with =
the times have used spm5. For obvious and other reasons I'd like to go =
with the latter. Along the route I have anatomical ROIs that were =
manually traced based on structural images normalized in spm2. I would =
like to use these as ROI masks for the former spm5 results. However, due =
to many differences in preprocessing and normalization routines I =
haven't found an easy way to make these images compatible (i.e., after =
playing around and comparing images they are obviously not aligned). The =
simplest answer would seem to be to just rerun the functional analysis =
in spm2 from which the ROIs were also created. However, I'm wondering if =
there is another relatively simple method to apply the spm2 normalized =
ROIs as masks in spm5? Anyone else try anything similar?

Please refer me on if this is deemed more of an SPM question, but as =
this group works more specifically with ROIs I thought I'd post here =
first. I've checked both list archives without much luck.

Thanks,

Todd

********************************************
Todd Girard, PhD
Assistant Professor, Department of Psychology
Member, School of Graduate Studies
Ryerson University, Toronto, ON, Canada
=A0
Research Scientist (Affiliate Status)
Clinical Research Department and Schizophrenia Department
Centre for Addiction & Mental Health, Toronto, ON

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