DWI grouping for sub-01
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Output "sub-01_dir-AP" (MultipartID auto+concat+0 [inferred]): 1 series
  Distortion group sub-01_dir-AP (PE j-, TRT 0.05s):
    - sub-01_dir-AP_dwi.nii.gz
    corrected by: auto+synsynb0 [inferred]

Fieldmap estimations:
  auto+synsynb0 [inferred]: fieldmap-less SyN
    - sub-01_T1w.nii.gz

Processing preview: eddy + TOPUP (--hmc-method eddy --sdc-method topup)
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Output "sub-01_dir-AP" (1 single series):
  1. The series is denoised.
  2. eddy corrects head motion and eddy currents.
  3. SyNb0 synthesizes an undistorted b=0 image from the T1w (sub-01_T1w.nii.gz); a constrained ANTs SyN registration of the b=0 to it estimates a fieldmap-less warp, applied to unwarp the results.
  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_dir-AP" (1 single series):
  1. The series is denoised.
  2. TORTOISE DIFFPREP corrects head motion and eddy currents.
  3. SyNb0 synthesizes an undistorted b=0 image from the T1w (sub-01_T1w.nii.gz); a constrained ANTs SyN registration of the b=0 to it estimates a fieldmap-less warp, applied to unwarp the DIFFPREP 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_dir-AP" (1 single series):
  1. The series is denoised.
  2. Without a PEPOLAR fieldmap the DRBUDDI second stage adds nothing: processing follows the FSL path with a fieldmap-less SyN warp against a SyNb0 synthetic b=0.
  3. The corrected series is written as one output file.
  !! WARNING [mixed-non-pepolar]: Estimation 'auto+synsynb0' is not PEPOLAR; the DRBUDDI second stage only refines PEPOLAR corrections, so 'sub-01_dir-AP' will get single-stage correction.

Processing preview: SHORELine + DRBUDDI (--hmc-method shoreline --sdc-method drbuddi)
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Output "sub-01_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. SyNb0 synthesizes an undistorted b=0 image from the T1w (sub-01_T1w.nii.gz); a constrained ANTs SyN registration of the b=0 to it estimates a fieldmap-less warp, applied to unwarp the corrected series.
  4. The corrected series is written as one output file.
