摘要
目的:建立m CT型PET/CT性能测试流程、方法学,开展技术评估。方法:依据国家标准GB17589-2011"X射线计算机断层摄影装置质量保证检测规范"和美国国家电气制造商协会(NEMA)NU 2-2007标准,利用核医学性能测试模体以及CT模体,对Siemens m CT型的PET/CT设备进行性能测试。结果:空间分辨力(FWHM):1 cm处横向4.16 mm,轴向4.04 mm;10cm处横向4.92 mm,轴向5.74 mm;系统灵敏度为9.6 s-1·k Bq-1、散射分数:35.4%、计数丢失和随机符合:1.69×105 s-1。PET性能指标依据国家标准,参考厂商标准及CT性能指标,测试结果均合格。结论:所采用的测试方法有效,测试技术流程符合国家标准GB 17589-2011。坚持定期用于PET/CT质量控制,对满足临床应用将起到技术保障作用。
Objective: It is to discuss results and significance of PET/CT in the performance tests. Methods: According to NEMA NU 2-2007 Performance Measurements of Positron Emission Tomographs and GB 17589-2011 specifications for quality assurance test for computed tomography X-ray scanners standards, with phantoms of nuclear medicine and CT, performance testing was done. Results: Spatial Resolution(FWHM): transverse 1 cm 4.16 mm, axial: 1 cm 4.04 mm, transverse 10 cm 4.92 mm, axial: 10 cm 5.74 mm. Sensitivity: 9.6 s-1·k Bq-1, scatter fraction: 35.4%, peak NEC rate: 1.69×105 s-1. Conclusion: According to manufacturers and national standards, the results of performances testing are up to standard. It is necessary to enhance the effect of in quality control(QC) of PET/CT and the fundamentality of the performance tests, so that the devices come to the demands for clinical practice.
引文
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