indi > Missing DWI JSON sidecar for ABIDE II BNI_1 dataset
12 hours ago | Bahar Selimbeyoglu
Missing DWI JSON sidecar for ABIDE II BNI_1 dataset

Hello,


I am working with the ABIDE II BNI_1 dataset and noticed that the DWI files include:















sub-30151_ses-1_run-1_dwi.nii.gz


sub-30151_ses-1_run-1_dwi.bvec


sub-30151_ses-1_run-1_dwi.bval














but the corresponding:















dwi.json

is missing from the original dataset.













The DWI file contains 33 volumes, and the .bvec and .bval files also contain 33 entries, so they appear to be internally consistent.


From the acquisition protocol, I found the following information:


Scanner: Philips Ingenia 3T Slice orientation: transverse Fold-over direction: AP Fat shift direction: P ... 











However, I am not sure how to convert the Philips protocol information into the correct BIDS value for:
















"PhaseEncodingDirection": "j"















or: 















"PhaseEncodingDirection": "j-"
















I also do not want to estimate fields such as TotalReadoutTime or EffectiveEchoSpacing
Could anyone from the ABIDE team, the BNI site, or anyone who has worked with this dataset share the original DWI JSON metadata or confirm the correct PhaseEncodingDirection and other required DWI metadata?

Thank you very much for your help!










Quote & Reply Reply