中华放射医学与防护杂志

刘辉,安晶刚,宋颖.SPECT设备系统性能测试及分析[J].中华放射医学与防护杂志,2015,35(10):767-770

SPECT设备系统性能测试及分析

SPECT system performance test and analysis of results

投稿时间：2014-09-19

DOI：10.3760/cma.j.issn.0254-5098.2015.10.011

英文关键词:SPECT NEMA standard Resolution System planar sensitivity

基金项目:公益性行业科研专项(201002009)

作者	单位
刘辉	10088 北京, 中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室
安晶刚	10088 北京, 中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室
宋颖	10088 北京, 中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室

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中文摘要:

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。

英文摘要:

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.

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