A smooth mask is a MICE specific concept which allows polygonal structures to be rendered on an image, allowing fractional values between 0 and 1. This makes it possible to improve the accuracy of the volume definition. If the polygon cuts a voxel precisely diagonally, the voxel value of the Smooth Mask at that voxel will be 0.5. When producing different statistics based on regions of interest, these can be weighted by the intensity of the Smooth Mask, greatly improving the accuracy especially for structures with small volumes. Note that the Smooth Mask is an ordinary Image and not a specific datatype, so the user must ensure that the input really is a Smooth Mask to avoid nonsense statistics.
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