上海市核医学显像仪器质控检测结果评估  

The evaluation of results of applying quality tests for SPECT, γ-camera and scanner

作　　者：刘兴党[1] 林祥通 邵鹏[2] 张锦明 田伟家[3] 

机构地区：[1]上海市核医学质量控制中心 [2]复旦大学附属肿瘤医院,上海200032 [3]上海第二医科大学瑞金医院,上海200025

出　　处：《核技术》2002年第5期371-374,共4页Nuclear Techniques

摘　　要：为了解上海市核医学显像仪器SPECT、γ -相机、扫描机的运转状况 ,促进显像仪器质量的提高。将系统模型、Hoffman脑模型置于显像床上 ,按各医院最佳临床常规显像条件采集 ,采用低能高分辨准直器。按各医院常规方法进行图像重建。甲状腺模型主要用于检测γ -相机分辨率。上海市目前 2 0家医院有SPECT 2 2台 ,其中双探头 8台 ,单探头 1 4台。 8台双探头SPECT ,两探头固有均匀性目测较一致者 5台 ,1 4台单探头固有均匀性较好者占 1 1台 ;双探头SPECT的热区分辨率约为 9— 1 0mm ,单探头约为 1 1— 1 2mm。双探头的冷区分辨率约为 1 0mm ,单探头约为1 1mm或 1 2mm。断层线性显示 ,2台双探头 4台单探头断层线性目测有歪曲 ,脑显像的图像不太理想。γ相机目前有 6台 ,2台已停止使用 ,2台均匀度不均匀 ,2台均匀度目测尚均匀 ,固有分辨率为 3— 4mm。扫描机 2台 ,仅能扫描出甲状腺模型的外形 ,不能分辨甲状腺“热”区和“冷”区。质控结果表明 ,上海市核医学显像仪器整体运行状况尚可 ,但应加快仪器的更新。To check the performance of SPECT, γ-camera and scanner in Shanghai, and to promote applying quality of nuclear medical imaging instrumentation. (1) Performance phantom (76-823 source tank, 76-824 set of 3 inserts): It permits measurements of the resolution of 'hot' lesions in a 'cold' field, 'cold' lesions in a 'hot' field, linearity, uniformity of response to a uniform field. (2) Hoffman brain phantom (model No.9000): Providing a truly three-dimensional model of the radioisotope distribution in the normal patient brain. The size and structure of the phantom including the gray and white matter subsections, are representative of studies in emission tomography. The phantom simulates the 4:1 gray to white matter uptake ratio, that is normally seen in studies such as 123 I and 99m Tc brain perfusion imaging in SPECT. (3) Thyroid phantom: Composing of three 'cold' lesions whose diameters are 8,10 and 12mm and one 'hot' lesion whose diameter is 10mm. Left lobe is 9mm thick while right one 18mm thick. There are 22 SPECT scanners including 8 double-detector SPECT and 14 single-detector SPECT. Of the 22 SPECT 16 were qualified in uniformity. The 'hot' lesions were 9-10mm with Double-detectors, 11-12mm with single-detector; while the 'cold' lesions were about 10mm and 11-12mm respectively. The brain imaging is not very good generally. 50% of γ-cameras were not qualified in uniformity. Scanners did not detect the thyroid phantom 'cold' or 'hot' lesion. According to the quality control results, the applying performance of nuclear medicine imaging instrumentation is relative satisfactory in Shanghai.

关 键 词：上海 核医学显像仪器 质量控制 SPECT γ-相机 扫描机 

分 类 号：R81[医药卫生—放射医学]