Fig. 1

Planar sensitivity variation in function of the distance from the detectors of the gamma camera GE-Discovery NM/CT 670. For each distance (8 cm, 13 cm, 18 cm), the planar sensitivity was estimated from the geometric mean using the Xeleris® software. A circular region of interest that delineates the source distribution was used. The planar sensitivity factor remained constant (6.11 ± 0.01 counts/s/MBq) from 8 to 18 cm