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Things to Do with ROI Datasets
¥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:
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?
Hi-res voxel matrix
Low-res voxel matrix