SPECT探头屏蔽性能的测量与评价
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摘要
目的:探讨单光子发射断层扫描(SPECT)探头屏蔽性能的测量及评价,为SPECT性能评估提供参考。方法:按照美国电气制造商协会(NEMA)NU1-2007方法,对SPECT机型Ⅰ型和Ⅱ型2种机型的SPECT探头屏蔽性能进行测量,用特定位置点源的计数率与探头中心处点源的计数率百分比值,评价探头的屏蔽泄漏性能。结果:对患者体内成像视野外放射性活度的屏蔽性能,在距探头边缘10 cm、20 cm和30 cm位置处,机型Ⅰ的2个探头屏蔽泄漏平均值分别为0.663%、0.123%和0.033%,机型Ⅱ分别为0.683%、0.295%和0.143%。对探头附近患者之外放射性活度的屏蔽性能,在距探头中心50 cm、100 cm、150 cm和200 cm位置处,检查床机架前方(F方向)机型Ⅰ两个探头在各方向点位时屏蔽泄漏平均值分别为0.024%、0.025%、0.026%和0.024%,机型Ⅱ分别为0.095%、0.098%、0.096%和0.105%;垂直于检查床方向(S方向)机型Ⅰ两个探头在各个方向点位时屏蔽泄漏平均值分别为0.073%、0.073%、0.070%和0.075%,机型Ⅱ分别为0.180%、0.183%、0.187%和0.198%。结论:SPECT机型Ⅰ和机型Ⅱ的两个探头的屏蔽性能无明显差别;视野外患者体内放射性物质对图像质量的影响高于患者体外;机型Ⅰ的屏蔽性能明显优于机型Ⅱ。
Objective: To explore the measurement and evaluation of shielding effectiveness of SPECT detector so as to provide reference for performance assessment of SPECT. Methods: The shielding effectiveness of SPECT detector of two types of SPECT were measured according to the method of NEMA NU1-2007. And the shielding effectiveness of the detector was described as the percentage(%) of the count rate of point source of specific location and the count rate of point source of the center of detector. Results: For the shielding effectiveness of radioactivity outside visual field for in vivo imaging of patients, the average percentages of shielding leakage of two detectors of type I were 0.663%, 0.123% and 0.033% at 10 cm, 20 cm and 30 cm apart from the edge of detector, respectively, while that of type II were 0.683%,0.295% and 0.143%. For the shielding effectiveness of radioactivity besides the patients near the detector, at the locations of 50 cm,100 cm,150 cm and 200 cm apart from the center of detector, the average values of shielding leakage of point location of two detectors of type I at each direction were 0.024%, 0.025%, 0.026% and 0.024% on the front of rack of check bed(F direction), respectively, and that of type II were 0.095%, 0.098%, 0.096% and 0.105%. Besides, the average values of shielding leakage of point location of two detectors of type I at each direction were 0.073%,0.073%,0.070% and 0.075% on the direction that was vertical to the check bed(S direction), respectively, and that of type II were 0.180%, 0.183%, 0.187% and 0.198%. Conclusion: There is no significant difference in the shielding effectiveness of two detectors of each equipment type. The effect of radioactivity in vivo of patients outside the visual field on image quality is higher than that in vitro of patients. And the shielding effectiveness of type I is significantly better than that of type II.
Objective: To explore the measurement and evaluation of shielding effectiveness of SPECT detector so as to provide reference for performance assessment of SPECT. Methods: The shielding effectiveness of SPECT detector of two types of SPECT were measured according to the method of NEMA NU1-2007. And the shielding effectiveness of the detector was described as the percentage(%) of the count rate of point source of specific location and the count rate of point source of the center of detector. Results: For the shielding effectiveness of radioactivity outside visual field for in vivo imaging of patients, the average percentages of shielding leakage of two detectors of type I were 0.663%, 0.123% and 0.033% at 10 cm, 20 cm and 30 cm apart from the edge of detector, respectively, while that of type II were 0.683%,0.295% and 0.143%. For the shielding effectiveness of radioactivity besides the patients near the detector, at the locations of 50 cm,100 cm,150 cm and 200 cm apart from the center of detector, the average values of shielding leakage of point location of two detectors of type I at each direction were 0.024%, 0.025%, 0.026% and 0.024% on the front of rack of check bed(F direction), respectively, and that of type II were 0.095%, 0.098%, 0.096% and 0.105%. Besides, the average values of shielding leakage of point location of two detectors of type I at each direction were 0.073%,0.073%,0.070% and 0.075% on the direction that was vertical to the check bed(S direction), respectively, and that of type II were 0.180%, 0.183%, 0.187% and 0.198%. Conclusion: There is no significant difference in the shielding effectiveness of two detectors of each equipment type. The effect of radioactivity in vivo of patients outside the visual field on image quality is higher than that in vitro of patients. And the shielding effectiveness of type I is significantly better than that of type II.
引文
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[11]耿建华,陈英茂.核医学成像设备的质量控制标准及中国质量控制现状[J].中华核医学与分子影像杂志,2015,35(1):75-78.
[12]张洁,马丽,李顺华.SPECT仪器质量控制和质量保证的初步探讨[J].中国临床医学影像杂志,2009,20(1):67-68.
[13]范向勇,周献锋,马加一.SPECT质量控制检测探讨[J].中国医学装备,2014,11(3):8-9.
[14]张艳敏,陈文新,余明细.SPECT/CT质量控制及影响因素分析[J].中国医疗设备,2016,31(9):122-127.
[15]International Atomic Energy Agency.IAEA-TECDOC-602 Quality control of nuclear medicine instruments 1991[M].Vienna:IAEA,1991.
[16]姚树林,陈英茂,耿建华,等.SPECT质量控制检测系统的设计与实现[J].中国医学装备,2016,13(9):6-10.
[17]姚树林,耿建华,陈英茂,等.一种通用型SPECT性能检测系统的验证研究--系统性能部分[J].中国医学装备,2017,14(6):37-40.
[18]姚树林,窦寰宇,王新强,等.2种SPECT联合质量控制与等效性比较[J].医疗卫生装备,2017,38(8):75-78.
[2]耿建华,陈英茂,陈盛祖,等.SPECT及SPECT/CT设备配置要求与选型方案[J].中国医学装备,2016,13(9):31-36.
[3]中华医学会核医学分会.2016年全国核医学现状普查结果简报[J].中华核医学与分子影像杂志,2016,36(5):479-480.
[4]National Electrical Manufacturers Association.NEMA NU-1 Standards Publication NU-1-2001:Performance measurements of Gamma cameras[S].Rosslyn,VA:National Electrical Manufacturers Association,2001.
[5]National Electrical Manufacturers Association.NEMA NU-1 Standards Publication NU-1-2007:Performance measurements of Gamma cameras[S].Rosslyn,VA:National Electrical Manufacturers Association,2007.
[6]National Electrical Manufacturers Association.NEMA NU-1 Standards Publication NU-1-2012:Performance measurements of Gamma cameras[S].Rosslyn,VA:National Electrical Manufacturers Association,2013.
[7]International Atomic Energy Agency.Quality assurance for SPECT system[M].Vienna:IAEA,2009.
[8]International Electrotechnical Commission.IECstandard 60789 3rd edition:Medical electrical equipment-Characteristics and Test Conditions of Radionuclide Imaging Devices-Anger type Gamma camera[S].Geneva:International Electrotechnical Commission,2005.
[9]American Association of Physicists in Medicine.Scintillation camera acceptance testing and performance evaluation[S].New York:American Institute of Physics,1980.
[10]国家质量监督检验检疫总局,国家标准化管理委员会.放射性核素成像设备性能和试验规则伽玛照相机GB/T18989-2013[S].北京:中国标准出版社,2014.
[11]耿建华,陈英茂.核医学成像设备的质量控制标准及中国质量控制现状[J].中华核医学与分子影像杂志,2015,35(1):75-78.
[12]张洁,马丽,李顺华.SPECT仪器质量控制和质量保证的初步探讨[J].中国临床医学影像杂志,2009,20(1):67-68.
[13]范向勇,周献锋,马加一.SPECT质量控制检测探讨[J].中国医学装备,2014,11(3):8-9.
[14]张艳敏,陈文新,余明细.SPECT/CT质量控制及影响因素分析[J].中国医疗设备,2016,31(9):122-127.
[15]International Atomic Energy Agency.IAEA-TECDOC-602 Quality control of nuclear medicine instruments 1991[M].Vienna:IAEA,1991.
[16]姚树林,陈英茂,耿建华,等.SPECT质量控制检测系统的设计与实现[J].中国医学装备,2016,13(9):6-10.
[17]姚树林,耿建华,陈英茂,等.一种通用型SPECT性能检测系统的验证研究--系统性能部分[J].中国医学装备,2017,14(6):37-40.
[18]姚树林,窦寰宇,王新强,等.2种SPECT联合质量控制与等效性比较[J].医疗卫生装备,2017,38(8):75-78.