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# Data format processing
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PEP has the ability to perform special processing for some data formats that would otherwise be cumbersome to distribute. Support for these data formats must be properly configured for appropriate columns.
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PEP has the ability to perform special processing for some data formats that would otherwise be cumbersome to distribute. The PEP team can configure appropriate columns to enable PEP's support for these formats.
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## MRI data in the BIDS format
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... | ... | @@ -122,8 +122,8 @@ BIDS data can be downloaded by means of the `pepcli pull` command without needin |
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/app/pepcli pull -P all-ppp -c Visit1.MRI.Anat -c IsTestParticipant
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```
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While data are usually downloaded as a single file, columns configured with BIDS support will produce a directory on the local file system. The directory will be populated with the files that were [originally uploaded](#uploading-bids-data). Within those files, however, any values originally containing the MRI data's short pseudonym will have been replaced by the [user pseudonym](Pseudonymization#identifiers-in-pep) for that participant. This user pseudonym can then be used as a identifier for the subject and/or MRI data during further processing. It should be noted that
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While data are usually downloaded onto the local file system as a single file, columns configured with BIDS support will produce a directory instead. The directory will be populated with the files that were [originally uploaded](#uploading-bids-data). Within those files, however, any values originally containing the MRI data's short pseudonym will have been replaced by the [user pseudonym](Pseudonymization#identifiers-in-pep) for that participant. This user pseudonym can then be used as a identifier for the subject and/or MRI data during further processing. It should be noted that
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- a substring of the user pseudonym will be used if the original short pseudonym was shorter.
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- if downloaders wish to join MRI data for multiple subjects into a single BIDS data set, they must (use third-party tooling to) do so themselves.
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- the `pepcli get` command provides no support for the BIDS format, so its use will produce the originally uploaded `tar` archive, which will contain placeholder values instead of user pseudonyms. |
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- the `pepcli get` command provides no support for the BIDS format, so its use will produce the originally uploaded `tar` archive, containing placeholder values instead of user pseudonyms. |
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