Hello,
I am using FLIRT to align two anatomical images acquired from the same subject: T2-weighted anatomical inplanes (grid = 256 x 256 x 44, voxel size = 0.750 x 0.750 x 3.000 mm) and a T1-weighted MPRAGE volume (192 x 256 x 160 voxels, 0.938 x 0.938 x 1.000 mm). My first inclination was to use 6 dof; however, I have also seen people use 7 dof for this purpose. Is there any rule that typically guides decisions of whether to use 6/7 dof for this kind of intra-subject alignment? I tried both options and any differences in the resulting .mat files appear to be very small.
Thanks for your time,
Karin
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