Problem in obtaining B-vector

[Maryam.Sh]

Hi everyone,

I have dHCP neonate data and I want to bring it onto the template linearly. My concern is about the B-vector. I performed the registration on the neonate image using FSL, but the issue is with the B-vector, which I don’t know how it transforms into the new space. Should I bring the B-vector separately into the new space?
If that’s the case, what tool can be used for this purpose?
Or, when the image goes into the new space, does the B-vector also go into the new space? If that’s the case, how can I obtain the new B-vector from the new image?
I would appreciate it if someone who has information about this could guide me.

Respectfully,
Maryam shapourjani

[Steven]

Hi @Maryam.Sh,

@Maryam.Sh

Should I bring the B-vector separately into the new space?

Yes, anytime a DWI image is transformed, the bvecs should be transformed with it.

@Maryam.Sh

If that’s the case, what tool can be used for this purpose?

There are a few. I’ve personally used this script https://github.com/MIC-DKFZ/TractSeg/blob/master/bin/rotate_bvecs#L31 . There are probably others though.

Best,
Steven