Hard to know for sure based on the available info. Maybe post the forward and inverse transforms for this person, and another person?
Also, try the inverse transform on another file which has ben normalzed into MNI space, and see what it does. My best guess would be that for some reason your ROI is being moved out of range.
Best of luck,
Colin Hawco, PhD
Neuranalysis Consulting
Neuroimaging analysis and consultation
www.neuranalysis.com
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-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Michael Craig
Sent: October-23-16 5:31 PM
To: [log in to unmask]
Subject: [SPM] Inverse transformation of MNI roi
Dear all,
I have a set of ROIs defined in MNI space that I am inverse-normalising into the native space of each of my subjects using the parameters derived from segmentation in SPM 8 (inv_seg_sn.mat). This procedure works well for all except for one of my subjects where the resulting ROI is an empty file (i.e. no image). The segmentation has worked well for this subject and when I look at the normalised images, they all match the MNI template very well. I am a bit puzzled as to why I can't put the ROIs back into native space for this one subject given that the segmentation has been successful.
Any thoughts on what might be the problem or suggestions on things to try would be much appreciated.
Best wishes,
Mike
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