| 采用NaI(Tl)晶针阵列的小型单管γ相机的性能研究 |
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| 引用本文： | 祝杰,刘士涛,雷晓文,许咨宗,汪兆民.采用NaI(Tl)晶针阵列的小型单管γ相机的性能研究[J].中国科学技术大学学报,2005(5). |
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| 作者姓名： | 祝杰 刘士涛 雷晓文 许咨宗 汪兆民 |
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| 作者单位： | 中国科学技术大学近代物理系 安徽合肥230026
(祝杰，刘士涛，雷晓文，许咨宗)，中国科学技术大学近代物理系 安徽合肥230026(汪兆民) |
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| 基金项目： | 国家自然科学基金(10275063) |
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| 摘 要： | 通过实验对采用NaI(Tl)晶针阵列的小型单管γ相机的性能进行了研究,得到的实验结果是:(1)能量响应:对Am-241(59.5 keV)的γ射线能量分辨率为19%;(2)位置线性:绝对非线性1 mm,微分非线性0.67 mm;(3)空间分辨率:半高宽为2.2 mm.得出的结论是:(1)采用NaI(Tl)晶针阵列的小型单管γ相机的压缩效应较小;(2)由于晶针单元限制了光子的分布,所以采用NaI(Tl)晶针阵列的小型单管γ相机的空间分辨率基本上由晶针的尺寸大小决定;(3)与平板式NaI(Tl)晶体小型单管γ相机相比,采用NaI(Tl)晶针阵列的小型单管γ相机的能量响应、位置响应和空间分辨率等性能都有一个较大的提高.
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| 关 键 词： | NaI(Tl)晶针阵列 能量响应 位置线性 空间分辨率 |
Study on the Performance of a Small Gamma Camera Using a Pixel NaI(Tl) Array and a PSPMT |
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| ZHU Jie,LIU Shi-tao,LEI Xiao-wen,XU Zi-zong,WANG Zhao-min.Study on the Performance of a Small Gamma Camera Using a Pixel NaI(Tl) Array and a PSPMT[J].Journal of University of Science and Technology of China,2005(5). |
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| Authors: | ZHU Jie LIU Shi-tao LEI Xiao-wen XU Zi-zong WANG Zhao-min |
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| Abstract: | The performance of a small gamma camera using a pixel NaI(Tl) array and a PSPMT has been studied.The following results are obtained:(1)The absolute non-linearity is 1 mm and the differential non-linearity is 0.67 mm.(2)The Energy resolution is 19% for Am-241(59.5 keV) gamma rays.(3)The spatial resolution is 2.2 mm.The conclusions are:(1)The array of crystal needles can reduce the shrinkage effect.(2)The spatial resolution of the small gamma camera using a pixel NaI(Tl) array and a PSPMT depends mainly on pixel size.(3)By comparon with a small gamma camera using a planar Na(Tl) crystal and a PSPMT,it is clear that the performance of the small gamma camera using a pixel NaI(Tl) array and a PSPMT has been improved greatly. |
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| Keywords: | pixel NaI(Tl) array energy response position linearity spatial resolution |
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