NEMA NU 2-2000+performance measurements on an ADAC MCD camera

The clinically oriented NEMA NU-2 2000+ performance standards have been per formed on an ADAC molecular coincidence detection dual-head camera. At 1 cm radius, the transverse resolution full-width at half-maximum was measured to be 5.2 (10.0) mm and the axial was 5.0 (10.6) mm. At 10 cm radius, the t ransverse radial resolution was 4.7 (7.4) nun and the transverse tangential was 8.5 (20.9) mm. The axial resolution was 14.0 (41.1) mm. The peak true count rate was 4370 counts/s at a concentration of 4.3 kBq/ml. The peak noi se equivalent count rate (NECR) was 1620 counts/s at 2.9 kBq/ml. The system scatter fraction was 48%. The maximum relative count rate error observed a t the NECR peak was -42%. The sensitivity was 1010 counts/s/MBq in the cent er and 870 counts/s/MBq at an offset of 10 cm. The contrast for the hot sph eres ranged from 18.5 (11.6)% to 11.6 (7.9)% for a contrast ratio of 8:1 (4 :1). For the cold spheres, it ranged from 41% to 25% with an overall backgr ound variability of 7%. The residual error in scatter and attenuation corre ction was approximately 50%. All measurements were performed at the maximum allowed crystal-to-crystal distance of 810 mm.