NiftiOrientation

struct NiftiOrientation

Orientation metadata for NIfTI output files.

Bundles direction cosines (in RAS convention), voxel sizes, and position offset. When valid is false the NIFTI writer falls back to identity orientation with 1 mm isotropic voxels.

Variables

Name	Description
voxel_size	3x3 direction cosine matrix (RAS convention).
position	World position in mm (RAS) of the centre of voxel (0,0,0).
valid	True when this struct contains valid orientation data.

Variable Details

position

float position[3]

World position in mm (RAS) of the centre of voxel (0,0,0).

valid

bool valid

True when this struct contains valid orientation data.

voxel_size

float voxel_size[3]

3x3 direction cosine matrix (RAS convention). Columns = NIfTI axes i, j, k. For FORGE images these are the phase, read and slice directions (FORGE stores y fastest). dircos[row][col]: row = x/y/z output axis, col = i/j/k. Voxel dimensions in mm along NIfTI axes i, j, k.