Never change the flip setting - otherwise it is extremely difficult to figure
out the left-right orientations.
Best regards,
-John
On Tuesday 06 November 2007 17:37, Manish Dalwani wrote:
> Hello SPM'ers,
>
> It's quiet amazing the trivial left right orientation is always such an
> issue.
>
> Here is my recent experience working on my data and need some advice:
> NOTE: The analyze.flip was turned on as "1" in SPM2 default file .
> The raw functional data I collect are in radiological format. When I
> reorient them (i.e. just align WITH the anterior commissure), it
> flips(which was quiet a surprise)....so now it is in neurological format.
> Normalize flips it again, and now it's back to radiological. I spent a
> whole day, making sure if I have consistent orientations for all my
> subjects as I mark the right side of my anatomicals (thank god).
>
> The smoothed normalized functional images are in radiological format. I
> ran the stats group analyses and I assumed that it stays radiological. Just
> to check, I changed the anaylze.flip to "0" and ran the stats again. The
> statmaps were flipped. My question is knowing that my final smoothed
> normalized functionals are in Radiological format, which results should I
> now believe in ? Why would group analyses flip the images?
>
> Kindly advise.
>
> Manish Dalwani
> Sr. PRA,
> Dept. of Psychiatry
> UCDHSC
>
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