FMRIPREP: Pepolar fieldmap SDC poor correction?

Summary of what happened:

I have gotten this to work in the past, so I’m not sure what I am doing differently this time

I am running fmriprep on a subject that has a T1w anat, two opposite-phase spin-echo fmap scans, and a func resting state scan.

I believe the correction is creating extra distortion in the sinuses… (see screenshots below)

My config.json file is:

{
  "dcm2niixOptions": "-b y -ba y -z y -f '%3s_%f_%d_%r'",
  "descriptions": [
    {
      "datatype": "anat",
      "suffix": "T1w",
      "criteria": {
        "SeriesDescription": "SAG_FSPGR_3D_.9X.9X.9"
      }
    },
    {
      "id": "task-rest",
      "datatype": "func",
      "suffix": "bold",
      "custom_entities": "task-rest_dir-AP",
      "criteria": {
        "SeriesDescription": "RestStatefMRI_HB4PA1"
      },
      "sidecar_changes": {
        "TaskName": "rest"
      }
    },
    {
      "datatype": "fmap",
      "suffix": "epi",
      "custom_entities": "dir-PA",
      "criteria": {
        "SeriesDescription": "SE_fMRI_pepolar_0",
        "PhaseEncodingPolarityGE": "Unflipped"
      },
      "sidecar_changes": {
        "IntendedFor": [
          "task-rest"
        ],
        "B0FieldIdentifier": "pepolar_fmap0"
      }
    },
    {
      "datatype": "fmap",
      "suffix": "epi",
      "custom_entities": "dir-AP",
      "criteria": {
        "SeriesDescription": "SE_fMRI_pepolar_1",
        "PhaseEncodingPolarityGE": "Flipped"
      },
      "sidecar_changes": {
        "IntendedFor": [
          "task-rest"
        ],
        "B0FieldIdentifier": "pepolar_fmap0"
      }
    }
  ]
}

Command used (and if a helper script was used, a link to the helper script or the command generated):

I ran:

dcm2bids -d sourcedata/AHIE01/bids -p AHIE001 -c sourcedata/AHIE01/bids/config.json -o $PWD/tmp_dcm2bids/helper

fmriprep-docker $PWD/tmp_dcm2bids/helper $PWD/tmp_dcm2bids/helper/derivatives/fmriprep participant -w $HOME/Desktop/work --dummy-scans 10 --fs-license-file license.txt --participant-label AHIE001

Version:

dcm2bids version: 3.2.0
Based on BIDS version: v1.9.0

fMRIPrep v24.1.1

Environment (Docker, Singularity / Apptainer, custom installation):

fmriprep is a docker, yes

Data formatted according to a validatable standard? Please provide the output of the validator:

        Summary:                Available Tasks:        Available Modalities:
        49 Files, 3.18GB        rest                    MRI
        4 - Subjects
        1 - Session

Relevant log outputs (up to 20 lines):

I’m not sure where to find these…

Screenshots / relevant information:


Specifically here:


oh, maybe this will help: