CAJ | 학술논문

目的：利用美国电器制造商协会（NEMA）NU2-2007标准对西门子Biograph mCT-S64 PET进行性能测试。方法参照NEMA NU2-2007标准和厂家测试手册，对设备的空间分辨率、散射分数、计数丢失、随机符合、灵敏度、精确度、能量和时间分辨率，以及图像质量、衰减和散射校正精度进行测试。结果设备在视野偏中心1 cm处横向和轴向空间分辨率分别为4.3 mm和4.6 mm，10 cm处横向、轴向和横断切向空间分辨率分别为4.9 mm、5.9 mm和4.7 mm；散射分数为37%；噪声等效计数率在28 kBq/mL时达峰值，为191 kcps；中心和偏中心10 cm处灵敏度分别为10.0 cps/kBq和10.4 cps/kBq；精确性偏差为2.3%；仪器能量分辨率为11.5%，时间分辨率为542.5 ps；图像质量模型中最小直径为10 mm的热球清晰可辨；衰减和散射校正的精确性相对误差为14%。与39环的Biograph 16HR相比，空间分辨率相近，散射分数和图像对比度增高，峰值噪声等效计数率提高125%，灵敏度提高123%。结论Biograph mCT的各项指标均达到NEMA NU2-2007标准要求。灵敏度、噪声等效计数率和图像质量提高，可缩短采集时间和减少药物注射量。
목적：이용미국전기제조상협회（NEMA）NU2-2007표준대서문자Biograph mCT-S64 PET진행성능측시。방법삼조NEMA NU2-2007표준화엄가측시수책，대설비적공간분변솔、산사분수、계수주실、수궤부합、령민도、정학도、능량화시간분변솔，이급도상질량、쇠감화산사교정정도진행측시。결과설비재시야편중심1 cm처횡향화축향공간분변솔분별위4.3 mm화4.6 mm，10 cm처횡향、축향화횡단절향공간분변솔분별위4.9 mm、5.9 mm화4.7 mm；산사분수위37%；조성등효계수솔재28 kBq/mL시체봉치，위191 kcps；중심화편중심10 cm처령민도분별위10.0 cps/kBq화10.4 cps/kBq；정학성편차위2.3%；의기능량분변솔위11.5%，시간분변솔위542.5 ps；도상질량모형중최소직경위10 mm적열구청석가변；쇠감화산사교정적정학성상대오차위14%。여39배적Biograph 16HR상비，공간분변솔상근，산사분수화도상대비도증고，봉치조성등효계수솔제고125%，령민도제고123%。결론Biograph mCT적각항지표균체도NEMA NU2-2007표준요구。령민도、조성등효계수솔화도상질량제고，가축단채집시간화감소약물주사량。
Objective To investigate the performance of mCT-S64-4R by using National Electrical Manufacturers Association (NEMA) NU 2-2007 protocol. Methods NEMA standard phantom and methods were used to test the specification of spatial resolution, scatter fraction, count loss, random measurement, sensitivity, energy and time resolution, image quality, accuracy of attenuation and scatter correction of mCT. Results The transverse and axial resolutions at 1 cm offset from the center were 4.3 mm and 4.6 mm. The scatter fraction was 0.37. The peak true count rate and noise equivalent count rate (NECR) were 550 kcps at 28 kBq/mL and 191 kcps at 28 kBq/mL. Sensitivity values were 10.0 cps/kBq at the center and 10.4 cps/kBq at 10 cm offset from the center. The accuracy bias of count rate was 2.3%. The relative error in attenuation and scatter correction was 0.14. The energy and time resolution were 11.5% and 542.5 ps respectively. Compared to the three rings scanner as Biograph 16HR, the system sensitivity and NECR were increased by 123% and 125%, respectively. Conclusion SIEMENS Biograph mCT-S64-4R performs good characteristics, especially in the improvement of image quality. The increase in sensitivity and NECR facilitates a decrease in either scan time or injected dose without compromising diagnostic image quality.