DWI grouping for sub-01
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Output "sub-01" (MultipartID auto+concat+0 [inferred]): 2 series
  Distortion group sub-01_dir-AP (PE j-, TRT 0.05s):
    - sub-01_dir-AP_part-mag_dwi.nii.gz
      with phase image sub-01_dir-AP_part-phase_dwi.nii.gz
    corrected by: auto+pepolar+j [inferred]
  Distortion group sub-01_dir-PA (PE j, TRT 0.05s):
    - sub-01_dir-PA_part-mag_dwi.nii.gz
      with phase image sub-01_dir-PA_part-phase_dwi.nii.gz
    corrected by: auto+pepolar+j [inferred]

Fieldmap estimations:
  auto+pepolar+j [inferred]: PEPOLAR (reverse phase-encoding)
    - sub-01_dir-AP_part-mag_dwi.nii.gz
      with phase image sub-01_dir-AP_part-phase_dwi.nii.gz
    - sub-01_dir-PA_part-mag_dwi.nii.gz
      with phase image sub-01_dir-PA_part-phase_dwi.nii.gz
    phase encoding axes: j (bidirectional)

Notes:
  WARNING [complex-part-unsupported]: sub-01_dir-AP_part-imag_dwi.nii.gz is a part-imag image of a complex-valued acquisition. QSIPrep uses the magnitude (and its phase) only, so it is ignored.
  WARNING [complex-part-unsupported]: sub-01_dir-AP_part-real_dwi.nii.gz is a part-real image of a complex-valued acquisition. QSIPrep uses the magnitude (and its phase) only, so it is ignored.

Processing preview: eddy + TOPUP (--hmc-method eddy --sdc-method topup)
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Output "sub-01" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated.
  2. TOPUP estimates the susceptibility field from b=0 images spanning 2 distortion groups (2 rows in the acquisition-parameters file).
  3. eddy corrects head motion, eddy currents, and susceptibility distortion in one model, using the TOPUP field. Every volume is assigned to its distortion group in the eddy index file.
  4. The corrected series is written as one output file.

Processing preview: TORTOISE + DRBUDDI (--hmc-method tortoise --sdc-method drbuddi)
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Output "sub-01" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated.
  2. TORTOISE DIFFPREP corrects head motion and eddy currents separately for each distortion group (sub-01_dir-AP, sub-01_dir-PA).
  3. DRBUDDI estimates distortion along the j axis from the blip-up (sub-01_dir-PA) and blip-down (sub-01_dir-AP) data and applies the correction to every volume.
  4. The corrected series is written as one output file.

Processing preview: eddy + TOPUP→DRBUDDI (--hmc-method eddy --sdc-method topup+drbuddi)
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Output "sub-01" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated.
  2. TOPUP estimates an initial susceptibility field from the b=0 images (as in the FSL path).
  3. eddy corrects head motion and eddy currents using the TOPUP field.
  4. DRBUDDI re-estimates distortion along the j axis from the eddy-corrected blip-up/blip-down dMRI series, refining the TOPUP correction.
  5. The corrected series is written as one output file.

Processing preview: SHORELine + DRBUDDI (--hmc-method shoreline --sdc-method drbuddi)
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Output "sub-01" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated.
  2. SHORELine iteratively corrects head motion by registering each volume to a 3dSHORE signal-model prediction (eddy currents are not corrected).
  3. DRBUDDI estimates distortion along the j axis from the blip-up (sub-01_dir-PA) and blip-down (sub-01_dir-AP) data and applies the correction to every volume.
  4. The corrected series is written as one output file.
