Mark,
I want to know the rotations in the xy, xz, and yz planes in degrees so I
can use these numbers to rotate a gradient file (I already have an excel
sheet that does this). How should I convert the numbers output by avscale
to degrees?
Thanks for your help,
Matt.
-----Original Message-----
From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf
Of Mark Jenkinson
Sent: Monday, February 05, 2007 11:23 AM
To: [log in to unmask]
Subject: Re: [FSL] Flirt Transformation Matricies
No.
They are elements of the off-diagonal terms of a skew matrix and
are therefore dimensionless.
All the best,
Mark
Matt wrote:
>Mark,
>
>Am I correct in assuming the following values are in radians?
>Skews (xy,xz,yz) = -0.002712 0.010341 0.043795
>
>Thanks,
>
>Matt.
>-----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
>
>
>On 5 Feb 2007, at 06:53, Matt Glasser wrote:
>
>
>
>>I would like to know the number of degrees of yaw, pitch, and roll
>>transformation of any given flirt transformation matrix. Could
>>someone
>>explain what the numbers in the matrix mean, or point me towards some
>>documentation that does?
>>
>>Thanks!
>>
>>Matt.
>>
>>
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