中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2015年
10期
767-770
,共4页
SPECT%NEMA标准%空间分辨力%系统平面灵敏度
SPECT%NEMA標準%空間分辨力%繫統平麵靈敏度
SPECT%NEMA표준%공간분변력%계통평면령민도
SPECT%NEMA standard%Resolution%System planar sensitivity
目的 通过对SPECT设备进行系统性能测试,分析影响系统性能指标的因素和系统性能指标之间的关系.方法 参考美国电气制造商协会(NEMA)标准以及厂家规范,测量了12个省市的31台SPECT设备的系统空间分辨力、系统平面灵敏度、断层空间分辨力等性能指标,这些指标全部是第一次检测时的测量结果.结果 系统空间分辨力:(7.90±0.62) mm,最大值9.46 mm,最小值7.04 mm;系统平面灵敏度:(78.54±13.17)s-1 ·MBq-1,最大值123.80 s-1 ·MBq-1,最小值56.70 s-1·MBq-1;断层空间分辨力:(13.12±2.59)mm,最大值18.13 mm,最小值8.45 mm,从数值上看,这3个指标的增减趋势是基本一致的,并且通过和厂家指标标准值的对比,3个系统性能指标均满足临床要求.结论 系统平面灵敏度和空间分辨力是相互制约的,晶体厚度的增加可以提升系统平面灵敏度,但同时会对其系统空间分辨力和断层空间分辨力产生负面影响,所以不同的临床应用,需要选择合适的准直器类型和晶体厚度.
目的 通過對SPECT設備進行繫統性能測試,分析影響繫統性能指標的因素和繫統性能指標之間的關繫.方法 參攷美國電氣製造商協會(NEMA)標準以及廠傢規範,測量瞭12箇省市的31檯SPECT設備的繫統空間分辨力、繫統平麵靈敏度、斷層空間分辨力等性能指標,這些指標全部是第一次檢測時的測量結果.結果 繫統空間分辨力:(7.90±0.62) mm,最大值9.46 mm,最小值7.04 mm;繫統平麵靈敏度:(78.54±13.17)s-1 ·MBq-1,最大值123.80 s-1 ·MBq-1,最小值56.70 s-1·MBq-1;斷層空間分辨力:(13.12±2.59)mm,最大值18.13 mm,最小值8.45 mm,從數值上看,這3箇指標的增減趨勢是基本一緻的,併且通過和廠傢指標標準值的對比,3箇繫統性能指標均滿足臨床要求.結論 繫統平麵靈敏度和空間分辨力是相互製約的,晶體厚度的增加可以提升繫統平麵靈敏度,但同時會對其繫統空間分辨力和斷層空間分辨力產生負麵影響,所以不同的臨床應用,需要選擇閤適的準直器類型和晶體厚度.
목적 통과대SPECT설비진행계통성능측시,분석영향계통성능지표적인소화계통성능지표지간적관계.방법 삼고미국전기제조상협회(NEMA)표준이급엄가규범,측량료12개성시적31태SPECT설비적계통공간분변력、계통평면령민도、단층공간분변력등성능지표,저사지표전부시제일차검측시적측량결과.결과 계통공간분변력:(7.90±0.62) mm,최대치9.46 mm,최소치7.04 mm;계통평면령민도:(78.54±13.17)s-1 ·MBq-1,최대치123.80 s-1 ·MBq-1,최소치56.70 s-1·MBq-1;단층공간분변력:(13.12±2.59)mm,최대치18.13 mm,최소치8.45 mm,종수치상간,저3개지표적증감추세시기본일치적,병차통과화엄가지표표준치적대비,3개계통성능지표균만족림상요구.결론 계통평면령민도화공간분변력시상호제약적,정체후도적증가가이제승계통평면령민도,단동시회대기계통공간분변력화단층공간분변력산생부면영향,소이불동적림상응용,수요선택합괄적준직기류형화정체후도.
Objective To analyze the influence factors on, and the relationship between, the system performance parameters by testing SPECT equipment.Methods By reference to National Electrical Manufactures Association standards and manufacturer's specifications, the performances of a total of 31 SPECTs in 12 provinces were measured, for the first time, with regard to their system spatial resolution (SSR) , system planar sensitivity (SPS) and tomographic spatial resolution (TPR).Results The results were as follows: (7.90 ± 0.62) mm for SSR, with the highest 9.46 mm and the lowest 7.04 mm;(78.54± 13.17)s-1· MBq-1 for SPS, with the highest 123.80 s-1 · MBq-1 and the lowest 56.70 s-1·MBq-1;and (13.12 ± 2.59) mm for TSR, with the highest 18.13 mm and the lowest 8.45 mm.These values indicated a nearly consistent upward and downward trend and could meet the clinical requirements by comparison with the manufactuer' s specifications.Conclusions Mutual restrictions have been shown between SSR and SPS.Increased thickness of the system crystal plane can improve the SPS, but also has a negative impact on the SSR.For all the above reasons, it is the optimum solution to choose the right type of collimator and crystal thickness for different clinical applications.
