Hi,
As I said previously, the matrices map between mm coordinate
spaces. Hence everything is in units of mm.
All the best,
Mark
On 1 Sep 2010, at 17:57, vivian wrote:
> Dear all,
>
> I'm using the FLIRT to do registration and I would like to display
> the result. May I ask what's the unit of output matrix? Especially
> the translation parameter. For example, the 2 volums are all 1.5 x
> 1.5 x 1.5 mm, and the omat of FLIRT is:
>
> MAT =
>
> 1.0000 0.0085 0.0042 -0.8243
> -0.0084 0.9997 -0.0227 0.7387
> -0.0044 0.0227 0.9997 -1.9653
> 0 0 0 1.0000
>
> Then how should I interpret the last column? Is that mm? or voxel
> number? or depends on some header information?
> Thank you very much,
> --
> Xiaowei.Zou
>
> Department of Biomedical Engineering
> Columbia University
> New York, NY, 10027
>
|