Fig. 6

Superposition of the CT and the contour of the 37 mm diameter sphere of the NEMA IEC phantom obtained by a anatomical segmentation of the CT (M1), b anatomical segmentation of the CT with a margin (M2) or c by thresholding the SPECT image (M3). Image d is the fusion of the CT and SPECT image (Bq/mL non-calibrated) and the superposition of the contours obtained with the three methods (M1, M2 and M3)