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PhaseEncodingDirection metadata #7

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ChristophePhillips opened this issue Sep 15, 2023 · 0 comments
Open

PhaseEncodingDirection metadata #7

ChristophePhillips opened this issue Sep 15, 2023 · 0 comments

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@ChristophePhillips
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ChristophePhillips commented Sep 15, 2023 •
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Currently the header are encode with the field PhaseEncodingDirectionSign set to a value 1 but this is NOT standard BIDS metadata...

In BIDS specs, one should be using PhaseEncodingDirection which can then take values i, j or k followed by - or + to encode for the axes and direction respectively.

In the original JSON (dump of the DICOM header), the 2 useful lines are:

  • "InPlanePhaseEncodingDirection": "ROW " ▶️ likely j
  • "PhaseEncodingDirectionPositive": 1 ▶️ likely +

but this should be thoroughly checked in light of this discussion, entitled "Determining BIDS PhaseEncodingDirection from DICOM".
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