Hi all, I am trying to find out how to compute EffectiveEchoSpacing and TotalReadoutTime for my BOLD data. So far I have failed to find a reference that gives a formula for these, I have heard that different softwares have different definitions so I am especially looking for references that are com…

Hi @hugofluhr These are two references I like for these definitions: https://support.brainvoyager.com/brainvoyager/functional-analysis-preparation/29-pre-processing/78-epi-distortion-correction-echo-spacing-and-bandwidth field maps – Lewis Center for Neuroimaging This post seems to be very…

Here are the sdcflows docs on methods we can use to determine the TRT: https://www.nipreps.org/sdcflows/master/api/sdcflows.utils.epimanip.html#sdcflows.utils.epimanip.get_trt If you are using dcm2niix, you may have gotten EstimatedEchoSpacing. dcm2niix is conservative and will not claim a EchoSpa…

Thank you both for these references, I will look at them in more details!

For GEHC dataset, EffectiveEchoSpacing and TotalReadoutTime documented here: Also, dcm2niix reports these in BIDS JSON for GEHC dcm2niix/GE at development · rordenlab/dcm2niix dcm2nii DICOM to NIfTI converter: compiled versions available from NITRC - rordenlab/dcm2niix …