Question about density compensation about torchkbnufft HOT 3 CLOSED

Yeah, I'm having trouble remembering why exactly I had that line. It could be that I was working with data with some other dimension, or maybe I put it in to handle lists and multiple variably-sized k-space trajectories.

You might be able to get a 3D version just by replacing with -3, assuming you are using a 3D radial trajectory (i.e., a "koosh-ball") with an even distribution of 3D angles. If you have some other 3D trajectory then you may need to look into the literature.

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Ok thanks for the feedback.

Well so far I used this density compensation scheme also for spiral trajectories in 2D and it seemed to work fine, at least in an unrolled architecture.

I think it might not be the same story indeed for stacks of radial/spiral or even SPARKLING.

If you don't want to address this feel free to close the issue.

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If you have something from the literature to add I think it would be nice, but I'm unable to add it at the moment.

There is a fair amount of research on spiral density compensations (I think this one is famous).

For stacks of radial you can use the one in the package - the Cartesian dimension doesn't require density compensation.

For now I will leave the issue open in case someone wants to Pull Request something in.

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