¥ROIs are used on a
voxel-by-voxel basis to select parts of datasets (usually functional datasets)
¥If you draw at the anatomical
resolution and want to use the ROI dataset at the functional resolution, you
probably want to convert the high-resolution ROI dataset to a
low-resolution dataset (unless youÕre working in +tlrc
coordinates)
HE.g., hi-res
anatomical ROI resampled to low-res functional dataset:
å
¥
¥
å
å
¥
¥
HEach voxel inside
the ROI is given a nonzero value (e.g., 4; values outside the ROI are zeros. When the resolution is changed, what do
you do with a voxel thatÕs only
partially filled by the ROI?