摘要目的 依照美国国家电气制造协会(NEMA)最新版NEMA NU 2-2001标准,对飞利浦公司生产的GEMINI GXL16 PET-CT仪进行验收和性能评估.方法 使用NEMA NU 2-2001标准的测试模型和测试方法,对PET的空间分辨率、能量分辨率、散射分数、计数丢失、灵敏度、PET与CT图像的融合精度等参数进行测试.结果 空间分辨率[(半高宽)mm]轴向为6.06(0cm)和6.44(10 cm),横向为4.65(1cm)和5.98(10 cm);散射分数为34.27%;能量分辨率为18%;中心(0 cm)和偏离中心10cm处的灵敏度分别为8312和8472(计数·s-1·MBq);等效噪声计数率为53.29×103计数/s;清楚分辨直径为10 mm的最小热球;PET与CT图像融合无偏离(模型).结论 该PET-CT仪的PET部分被测试指标均达到出厂要求,通过验收.

abstractsObjective To evaluate the performance specification of PHILIPS GEMINI GXL16 PETCT through the acceptance tests. Methods Acceptance tests of GEMINI GXL16 PET-CT consist of PET performance measurements and the precise measurement of imaging fusion. The performance measurement of PET was based on NEMA standard (NU 2-2001 version). Results Spatial resolution( FWHM, mm ) was 6.06/6.44 (axial, 2D/3D) and 4.65/5.98 (tansverse, 2D/3D). Scatter fraction (SF) was 34.27%. Energy resolution was 18％. Sensitivity (counts·s-1·MBq-1) was 8312/8472 (center/1 0cm). Noise equivalent count rate was 53.29 kcps. The phantom imaging can recognize small sphere with diameter 10 mm and the imaging fusion was precise. Conclusion The PET measurement results of the PET-CT met the requirement of manufacture's standard, therefore acceptance test was approved.