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CMRR-C2P / MB

Support for CMRR multi-band pulse sequences
http://www.cmrr.umn.edu/multiband/
MIT License
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Issues with the 3D EPI option #318

Open torbenelund opened 1 year ago

torbenelund commented 1 year ago

Dear multiband developers

Thanks for providing the excellent multi band EPI sequence. It is so fantastic to have a super flexible EPI sequence which can do most of the things I desire.

Yesterday I tried the 3D option in the multi band sequence and managed to set it up with 3 slabs of 14 slices acquired with an enplane acceleration of 3 and a Accel. factor 3D also of 3.

The SNR in the images look decent, but I have to issues.

  1. If I try to save Magn./Phase I get a reconstruction error (see attached screen shot
  2. There seems to be some "leakage" between slabs when 3D acceleration is used. Decreasing the slice overlap factor to -50% removes the problem, but introduces significant signal loss in the slices at the boarder of the slab. Increasing the slice oversampling up to 100 % does not help.3.

Do you have any tips I can try out, to solve these two issues?

Best regards Torben

ReconError2 ReconError1 slab_leakage

eauerbach commented 1 year ago

I will look into the magn/phas issue, the reconstruction should not fail. As for the artifacts, I don't know that anything is "wrong", it may just be that the protocol you are attempting is not feasible at 3T with that coil.