Gradients w.r.t. coordinates in ktraj

[tobitk]

Hi,
thanks for the great package!
Is it right that both nufft and adjoint nufft are only differentiable w.r.t. the input image/k-space but not w.r.t. the coordinates in the input trajectory?
Is it feasible to add gradients w.r.t. to the coordinates as well?

Best,
Tobit

[mmuckley]

Migrating to a Discussion since this does not document a bug.

Hello @tobitk, you are correct. You might want to look into methods like BJORK for what you want to do.

CC @guanhuaw

[tobitk]

Thanks for you answer! In the end, this repo solved my problem.