ENH dwi2adc: Support general DWI input

MRtrix3 / mrtrix3

MRtrix3 provides a set of tools to perform various advanced diffusion MRI analyses, including constrained spherical deconvolution (CSD), probabilistic tractography, track-density imaging, and apparent fibre density

http://www.mrtrix.org

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ENH dwi2adc: Support general DWI input #2195

Open Lestropie opened 3 years ago

Lestropie commented 3 years ago

If the input provided to the dwi2adc command is not pre-generated trace-weighted volumes for each unique b-value, but a 4D DWI series more generally, then the command should still be able to produce an ADC image from such; whether by invoking DWI::Shells and internally calculating those trace-weighted images, or if that's not possible, just feeding the individual DWI b-values & intensities directly into the solver.

Lestropie commented 2 years ago

Promoted to 3.1.0 milestone as explaining how to use this command keeps annoying me.

Lestropie commented 1 year ago

In addition to changing the interface of the command, it should be possible to change the estimation procedure as well. E.g.:

Do not invoke shells; instead, use the same estimation procedure as is used in dwi2tensor (default IWLS with 2 iterations), with each DWI volume used as an independent input.
Use the same approach as above, but do invoke the shelling algorithm, and use the l=0 term of the SH rather than the raw powder average in order to get an unbiased estimate of the mean DWI signal in each shell.

Lestropie commented 4 months ago

As much as I want this change, it's a bit of work, and not strictly necessary for 3.1.0, so I'm changing the milestone.