Hi,
I was doing some exploration on gradient table correction for DTI and avscale output. Then I encountered an email from Mark Jenkinson (see below) that was warning users that the decomposition of the affine transformation matrix would not be unique. As I understand, the bvecs correction script is using avscale. I would be grateful if someone could comment on the reliability of such bvecs correction. I am also using avscale to generate a measure of "magnitude of motion". Would that be a reliable comparison across subjects?
Best,
Tugan
-----Original Message-----
>> From: FSL - FMRIB's Software Library [mailto:[log in to unmask]]
>> On Behalf Of Mark Jenkinson
>> Sent: Monday, February 05, 2007 3:08 AM
>> To: [log in to unmask]
>> Subject: Re: [FSL] Flirt Transformation Matricies
>>
>> You can get *a* decomposition into angles using avscale.
>> However, such decompositions are not unique (there are lots of
>> arbitrary choices) so beware if you intend to compare these
>> with anything else.
>>
>> All the best,
>> Mark
>>
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