Add diffusion weighted imaging (DWI) formats

[nausikaa8]

@ofgulban: would it be useful to have the BrainVoyager DWI formats implemented in bvbabel? Most prominent are:

• *.dmr/*.dwi (slice-based data)
• *.vdw (volume-based data)

Some others are:

• *.ddt (diffusion tensors)
• *.grb (bvec/bval)
• *.fbr (reconstructed fiber tracts).

[ofgulban]

@nausikaa8 , thanks for the suggestion. Are you aware of any resource document which gives the header details of these files?

[nausikaa8]

Hi @ofgulban, some online resources can be found on the BrainVoyager support site, like the DWI file format, VDW file format, DDT file format. An overview of the file types can be found on page 63 in the DTI in BrainVoyager Guide by Pim Pullens.

[nausikaa8]

@ofgulban, an implementation of the *.dmr and *.dwi format is included in BV file I/O code in C++.

[ofgulban]

Thanks a lot @nausikaa8 , great.

[nausikaa8]

Is anyone working on this, @ofgulban? Otherwise I could start with the *.vdw format.

[ofgulban]

Please go ahead with the *.dwi format. I am not working on this currently.

[nausikaa8]

(Was typo, changed *.dwi to *.vdw format, hopefully that would be welcome, too.)