2021
DOI: 10.31219/osf.io/gy8nt
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The Bermuda Triangle of d- and f-MRI sailors - software for susceptibility distortions (SDCFlows)

Abstract: Echo-Planar Imaging (EPI) allows very fast acquisition of whole-brain data, which enables standard functional & diffusion MRI (f/dMRI). However, EPI is notably sensitive to variations in the base B0 field. Small deviations in parts-per-million from the nominal B0 caused by steps in magnetic susceptibility (tissue interfaces) introduce misplacements in the registered location of voxels of up to some cm in standard settings along the phase-encoding direction (PE), apparent as local geometrical distortion… Show more

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Cited by 8 publications
(7 citation statements)
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“…First, quantitative metrics reported from MRIQC version 23.1.0 (Esteban et al, 2023) for the structural and BOLD data are evaluated to assess data quality and potentially problematic subjects. Second, behavioral data will be inspected to confirm that participants have the behavioral data for each run and that participants are performing at the targeted probe hit rate (e.g., at or near 60% overall probe hit rate, see supplemental Section 1.2).…”
Section: Data Quality Control and Preprocessingmentioning
confidence: 99%
“…First, quantitative metrics reported from MRIQC version 23.1.0 (Esteban et al, 2023) for the structural and BOLD data are evaluated to assess data quality and potentially problematic subjects. Second, behavioral data will be inspected to confirm that participants have the behavioral data for each run and that participants are performing at the targeted probe hit rate (e.g., at or near 60% overall probe hit rate, see supplemental Section 1.2).…”
Section: Data Quality Control and Preprocessingmentioning
confidence: 99%
“…Specifically, tissue boundaries produce steps of deviation from the nominal B 0 field, which are larger where the air is close to tissues. Because of these deviations, the signal is recorded at locations slightly displaced from the sampling grid along the phase encoding axis leading to susceptibility distortions (Esteban et al, 2021 ). Susceptibility distortions manifest in two different ways on the BOLD average panel of the MRIQC visual report ( Supplementary Figure 2 ): as signal drop-out, that is, a region where the signal vanishes (criterion BA), or as brain distortions (criterion BB).…”
Section: Methodsmentioning
confidence: 99%
“…BOLD fMRI is prone to geometric distortions in the phase-encoding direction which can be largely corrected using a variety of methods (Esteban et al ., 2021; Jezzard and Balaban, 1995). Adjacent to motion-sensitive cerebrospinal fluid (CSF), the brainstem is particularly susceptible to such geometric distortions.…”
Section: Methodsmentioning
confidence: 99%