DWI grouping for sub-01
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Output "sub-01_acq-pair" (MultipartID acq-pair [curated]): 2 series
  Distortion group sub-01_dir-AP_acq-pair (PE j-, TRT 0.05s):
    - sub-01_dir-AP_dwi.nii.gz
    corrected by: auto+pepolar+j [inferred]
  Distortion group sub-01_dir-PA (PE j, TRT 0.05s):
    - sub-01_dir-PA_dwi.nii.gz
    corrected by: auto+pepolar+j [inferred]

Output "sub-01_acq-solo_dir-AP" (MultipartID acq-solo [curated]): 1 series
  Distortion group sub-01_dir-AP (PE j-, TRT 0.05s):
    - sub-01_dir-AP_dwi.nii.gz
    corrected by: auto+pepolar+j [inferred]
  Borrows for fieldmap estimation (auto+pepolar+j), not included in this output:
    - sub-01_dir-PA_dwi.nii.gz

Fieldmap estimations:
  auto+pepolar+j [inferred]: PEPOLAR (reverse phase-encoding)
    - sub-01_dir-AP_dwi.nii.gz
    - sub-01_dir-PA_dwi.nii.gz
    phase encoding axes: j (bidirectional)

Notes:
  WARNING [multipart-overlap]: Virtual acquisition mode: 1 DWI series with multiple MultipartIDs; each is preprocessed once per group and appears in each of those outputs.
  WARNING [estimation-spans-outputs]: Fieldmap estimation 'auto+pepolar+j' corrects DWI series in 2 different correction units; it will be estimated once per unit.

Processing preview: eddy + TOPUP (--hmc-method eddy --sdc-method topup)
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Output "sub-01_acq-pair" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated. (--denoise-after-combining reverses this order.)
  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.

Output "sub-01_acq-solo_dir-AP" (1 single series):
  1. The series is denoised.
  2. TOPUP estimates the susceptibility field from b=0 images spanning 2 distortion groups (2 rows in the acquisition-parameters file).
     b=0 images are borrowed from sub-01_dir-PA_dwi.nii.gz for the estimation; those series are NOT included in this output.
  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_acq-pair" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated. (--denoise-after-combining reverses this order.)
  2. TORTOISE DIFFPREP corrects head motion and eddy currents separately for each distortion group (sub-01_dir-AP_acq-pair, 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_acq-pair) data and applies the correction to every volume.
  4. The corrected series is written as one output file.

Output "sub-01_acq-solo_dir-AP" (1 single series):
  1. The series is denoised.
  2. TORTOISE DIFFPREP corrects head motion and eddy currents.
  3. DRBUDDI estimates distortion along the j axis from the blip-up (borrowed series) and blip-down (sub-01_dir-AP) data and applies the correction to every volume.
     b=0 images are borrowed from sub-01_dir-PA_dwi.nii.gz for the estimation; those series are NOT included in this output.
  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_acq-pair" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated. (--denoise-after-combining reverses this order.)
  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.

Output "sub-01_acq-solo_dir-AP" (1 single series):
  1. The series is denoised.
  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.
     b=0 images are borrowed from sub-01_dir-PA_dwi.nii.gz for the estimation; those series are NOT included in this output.
  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_acq-pair" (2 series):
  1. Each series is denoised on its own, then all 2 series are concatenated. (--denoise-after-combining reverses this order.)
  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_acq-pair) data and applies the correction to every volume.
  4. The corrected series is written as one output file.

Output "sub-01_acq-solo_dir-AP" (1 single series):
  1. The series is denoised.
  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 (borrowed series) and blip-down (sub-01_dir-AP) data and applies the correction to every volume.
     b=0 images are borrowed from sub-01_dir-PA_dwi.nii.gz for the estimation; those series are NOT included in this output.
  4. The corrected series is written as one output file.
