Point : draw one voxel at a time.

Disk : draw a "disk" within a radius of the "brush radius " size on one slice at a time.

Ball : draw a "ball" within a radius of the "brush radius" size on several slices.

On : outlines that you draw will be continuous even if you draw rapidly.

Off : if you draw rapidly, lines won't be continuous.

On : Each voxel on which you draw will be added to the current region, even if it was already in another region. For examle, if a voxel V is in a region A and you're drawing a region B passing on voxel V, this voxel will move to region B.

Off : a voxel which is already in a region cannot be put in another one.

On : you can see your ROI in several views simultaneously while drawing.

Off : you cannot see your ROI in several views simultaneously while drawing.

Voxel : the unit for the brush radius size is the voxel.

mm : the unit for the brush radius size is the mm.