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The main purpose of this PR is to improve how imaging data is detected. Currently, when DICOM files aren't present, we reply on the existence of the JSON metadata files (either provided by
dcm2niix
, other software, or manually created) for detecting imaging data. This approach should be inverted, where we check for the existence of the actual image files (i.e. NIfTI). Furthermore, the BIDS specification doesn't require metadata for all datatypes, such asanat
sequences. Even under scenarios where there are no corresponding JSON metadata files yet specific metadata is required, our recent metadata support guides users to provide this information.This PR will therefore be most relevant in situations where only NIfTI files are provided, a not entirely uncommon case.