The nuclear image is combined with ultrasound image (u) of patient body, and accordingly an evaluation index corresponding to nuclear and ultrasound sub-images are calculated (step 4) for several relative position of nuclear and ultrasound image. The relative position with optimal value of evaluation index is selected as spatial registration position of sub-images. ??Independent claims are also included for the following: ??(1) imaging device; ??(2) medical nuclear image.
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