ENH: if the determinant of the direction vectors matrix is negative, NIFTI writes out quaternions that are the right handed equivalent of the left-handed system, and according to the documentation, it is rotated 180 degrees AFNI, and on read, a similar negation in the case of a lefthanded system yields properly oriented images
ENH: if the determinant of the direction vectors matrix is negative, NIFTI writes out quaternions
that are the right handed equivalent of the left-handed system, and according to the documentation, it is rotated 180 degrees
AFNI, and on read, a similar negation in the case of a lefthanded system yields properly oriented images

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