Try mri_coreg. You can run it with multiple cores with --threads N

On 6/17/2021 8:48 AM, Marina Fernández wrote:

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Dear experts,

I would like to co-register T2 to T1 robustly, both images have a resolution of 0.65mm3.

Firstly, I tried bbregister with the '--init-rr' flag, but this function doesn't allow to keep the native voxel resolution (i.e., 0.65mm3), changing it to 1 mm.  As I wanted to maintain the native voxel resolution , I tried the mri_robust_register function (corresponding to the '--init-rr' flag) as explained in the help associated with this function, but this process took thirteen hours:

EXAMPLE 4. Robust cross modal registration:

mri_robust_register --mov movT2.mgz --dst dstT1.mgz --satit --iscale

--mapmov T2_to_T1.mgz --lta T2_to_T1.lta --cost ROBENT --entradius 2

--entcorrection --weights T2_to_T1_weights.mgz

I also tried the standard cross modal registration. The process didn't take as long, but the result was not as accurate as bbregister.

EXAMPLE 5. Standard cross modal registration:

mri_robust_register --mov movT2.mgz --dst dstT1.mgz --mapmov T2_to_

T1.mgz --lta T2_to_T1.lta --cost NMI

Could you suggest me how to accurately register T2 to T1 images maintaining the native voxel resolution in a shorter time?

Thank you very much in advance.

Best, Marina

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