Abstract
Siemens has recently developed a new PET/SPECT dual-head camera, the e.cam/sup duet//spl reg/. This camera employs two HD3 detectors with 2.54 cm (1") deep Na(I) segmented crystals. This design, relatively new for Na(I), is aimed at increasing the stopping power for 511 keV /spl gamma/ rays, while maintaining good spatial resolution for SPECT. The PET performance of this camera was evaluated using the new NEMA NU2-2001 specifications. The effect of the thicker crystal on the camera's performance in the single photon acquisition mode was assessed by comparing its resolution and sensitivity to that obtained with a standard gamma camera with a 0.9525 cm (3/8") deep crystal. The Siemens e.cam was selected for this purpose as it is a very similar dual-head variable-angle system with several hardware and software elements identical to the e.cam/sup duet//spl reg/ camera.
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