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滤波反投影重建

于 2022-02-15 发布 文件大小:1.06 kB
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用于滤波反投影重建,式(2·27)又称“滤波反投影方程”,它集中体现了滤波(卷积)反投影算法的 各个步骤。把它分解出来得到图2.14所示的框图。具体说来有下述三大步【11J: 1.把在固定视角鹏下测得的投影p@,识)经过滤波,得到滤波后投影 g“,呜); 2.对每一个舜,把g瓴,瞻)反投射于满足‘-,∞s(口一旃)的射线上的所有 各点(r,一); 3.将步骤2中的反投影值对所有0t妒‘石进行累加(积分),得重建后的图 像。 2.4

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