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FIGURE 2. Example of registration of CT and PET images acquired from separate scanners. (A) Original CT. (B) PET after rigid-body registration. (C) PET after elastic registration. (D) PET/CT fused after rigid-body registration. (E) PET/CT fused after elastic registration. Solid rectangles highlight improvement in matching of a cancerous mass in CT and PET after elastic registration as compared with only rigid-body registration. Also note the improved matching near the liver (marked by arrows) after elastic registration as compared with rigid-body registration.
