新型半导体心脏专用SPECT的常规质量控制方法

摘要

目的：建立新型半导体心脏专用NM Discovery 530c和Spectrum D单光子发射型电子计算机断层显像仪(SPECT)的每日常规质量控制方法。方法：对NM Discovery 530c的质量控制放射源采用740 MBq 57Co面源，主要质量控制参数及参考值能峰为(122±1.5)keV，能量分辨率半高宽(FWHM)≤7.5%，均匀性≤9%，中心坏点像素单元数≤30，超过7个坏点的探头数≤3。对Spectrum D-SPECT质量控制放射源采用370 MBq 57Co线源，主要参数指标可接受范围分别为区域均匀性＞90%、整体均匀性＞85%和有效视野＞90%，灵敏度为(2277.6±38.1)cpm/mCi；连续进行10 d的质量控制检测。每日分别采集10例99Tcm-MIBI心肌灌注显像，并评价其图像质量。结果：NM Discovery 530c和Spectrum D-SPECT的各项质量控制指标测试结果均在可接受范围内，图像优良率均为100%。结论：新型半导体心脏专用SPECT常规质量控制测试指标达到要求，心肌显像图像质量可以得到有效的保证。%Objective:To establish a regular daily quality control method for the new cardiac semiconductor SPECT. Methods: The 740 MBq 57Co flood source for NM Discovery 530c was used. Quality control parameters and reference value were energy peak 122±1.5 keV, FWHM≤7.5%, uniformity≤9%, central bad pixels≤30, the number of detectors with more than 7 bad pixels ≤3. The 370 MBq 57Co line source for Spectrum D-SPECT was used. Reference value of quality control parameters were regional homogeneity index >90%, global homogeneity index>85%, effective field of view>90%, specificity 2277.6±38.1cpm/mCi. Results:10 consecutive daily quality controls were performed for NM Discovery 530c and Spectrum D-SPECT. 10 cases of 99Tcm-MIBI myocardial perfusion imaging per day were acquired separately and the quality of images was evaluated by experienced nuclear medicine physicians. All quality control parameters for NM Discovery 530c and Spectrum D-SPECT were acceptable and the excellence of images was 100%. Conclusion:The standard daily quality control method for the new semiconductor cardiac SPECT can guarantee the image quality of myocardial perfusion imaging.