Greatly improved the "memory footprint" of the EdgeWave function and surrounding procedures.  On the 512x512x667 volume that was causing the "CT Brain Atrophy" crash with Build 172 (memory footprint:  2.4GB  max allocated memory\ 680MB max allocated block),  footprint was substantially reduced for problem-free execution (down to 1.3GB max allocated memory\320 MB max allocated block).