| 在SPECT上取得人体透射图像的方法 |
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| 引用本文： | 金永杰,桂大为,陈牧,刘以农,李玉兰.在SPECT上取得人体透射图像的方法[J].清华大学学报(自然科学版),2000,40(1). |
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| 作者姓名： | 金永杰 桂大为 陈牧 刘以农 李玉兰 |
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| 作者单位： | 清华大学,工程物理系,北京,100084 |
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| 基金项目： | 国家自然科学基金项目! (396 70 2 2 7) |
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| 摘 要： | 为使人体对γ射线的衰减造成核医学影像的失真和定量误差得到校正 ,在用于发射成像的单光子发射断层扫描机 (SPECT)上安装偏置的线源和平行缝准直器 ,可以获得倾斜的扇形束透射投影。这项构想在三探头 SPECT系统上进行了实验 ,取得了清晰的透射投影。使用 3种方法重建出衰减系数分布图 ,证明倾斜扇形束投影作 36 0°扫描能解决数据截断的问题 ,为这种特殊的投影几何结构推导的公式能够准确地重建出断层图像
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| 关 键 词： | 单光子发射断层成像 倾斜的扇形束投影 图像重建 |
Method of obtaining body attenuation maps on SPECT |
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| JIN Yongjie,GUI Dawei,CHEN Mu,LIU Yinong,LI Yulan.Method of obtaining body attenuation maps on SPECT[J].Journal of Tsinghua University(Science and Technology),2000,40(1). |
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| Authors: | JIN Yongjie GUI Dawei CHEN Mu LIU Yinong LI Yulan |
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| Abstract: | Photon attenuation within the body causes the quantitative errors in a single photon emission tomography (SPECT) image. The attenuation map must be known for proper attenuation correction. A shifted line source and slice collimator were used to obtain oblique fan beam transmission projection data on a three detector SPECT system. Hi quality projection data were acquired, and 3D attenuation maps were reconstructed using three methods. The experiments show that 360 degree scanning can compensate projection truncation of an oblique fan beam and that a special analytic algorithm, convolution back projection reconstruction inferred for oblique fan beam projection, can accuralely reconstruct the 3D attenuation. |
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| Keywords: | single photon emission tomcgraphy (SPECT) oblique fan beam projection image reconstruction |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
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