Reading DWI phase encoding direction from json files

[Jenna Blujus]

Hi all,

I have used dcm2niix to convert the raw DWI DICOM files from ADNI phases 2 and 3. I now need to determine the phase encoding direction for each scan to use the eddy tool. I've read that you can get this information from the JSON tag "PhaseEncodingDirection" with i, j, and k referring to the x, y, and z axes. For example, "PhaseEncodingDirection": j would refer to a P>>A acquisition while "PhaseEncodingDirection": j- would indicate A>>P. Can you confirm this or recommend how to read the phase encoding direction from the JSON file?

Thank you,

Jenna

[Nicole Saltiel]

I am also interested in this answer!

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