I would like to use fmriprep for preprocessing fmri data with distortion correction. I have been having problems finding a publicly available data set that contains phase difference field maps and/or blip-up/blip-down calibration scans. I have browsed the public data sets hosted on https://openneuro.org/public/datasets. This leads me to two questions.
Does anyone know where I can find such a data set? I have tried to run fmriprep on my own data set with fieldmap correction without much success. I am hoping to run it on fmriprep on a known test data set to have a better understanding of where my data set is failing.
Since I have found lots of data sets acquired without distortion correction (or at least posted without it) does this imply that people feel that acquiring and applying distortion correction is just not worth the trouble.