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[FIX] Amend note about *b*-vecs on DWI specs #782

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May 27, 2021
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[FIX] Amend note about *b*-vecs on DWI specs #782

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4 changes: 2 additions & 2 deletions src/04-modality-specific-files/01-magnetic-resonance-imaging-data.md
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Expand Up @@ -548,8 +548,8 @@ Following the FSL format for the `[*_]dwi.bvec` specification, the coordinate sy
the *b* vectors MUST be defined with respect to the coordinate system defined by
the header of the corresponding `_dwi` NIfTI file and not the scanner's device
coordinate system (see [Coordinate systems](../99-appendices/08-coordinate-systems.md)).
The most relevant implication for this choice is that any rotations applied to the DWI data
also need to be applied to the *b* vectors in the `[*_]dwi.bvec` file.
The most relevant limitation imposed by this choice is that the gradient information cannot
be directly stored in this format if the scanner generates *b*-vectors in *scanner coordinates*.

Example of `[*_]dwi.bvec` file, with *N*=6, with two *b*=0 volumes in the beginning:

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