getAllenHMask Returns hemisphere mask for Allen volume at given resolution

Syntax

mask = getAllenHMask(res, hemi)

Description

mask = getAllenHMask(res, hemi) outputs the mask as a logical array, where the hemisphere is selected by the value of hemi. If hemi is 1, the mask corresponds to the left hemisphere. If hemi is 2, the mask corresponds to the right hemisphere. If hemi is 3, the mask includes both hemispheres.

Examples

mask = getAllenHMask(50, 1); % left hemisphere at resolution 50 mask =
getAllenHMask(100, 2); % right hemisphere at resolution 100 mask =
getAllenHMask(25, 3); % both hemispheres at resolution 25

Input Arguments

res - resolution (numeric scalar) Resolution of the Allen volume mask.

hemi - hemisphere selector (1 | 2 | 3) 1 for left, 2 for right, 3 for both hemispheres.

Output Arguments

mask - logical array Logical mask for the selected hemisphere at the specified resolution.

Usage Notes

The mask size matches the Allen volume at the given resolution.

Authors

Mehul Gajwani, Monash University, 2025