A reconstruction algorithm from truncated projections.
A reconstruction algorithm from truncated projections.
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DOI：
10.1109/tmi.1984.4307648
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发表时间：
1984-01-01
影响因子：
10.6
通讯作者：
Yuta, S
中科院分区：
文献类型：
--
作者：
Ogawa, K;Nakajima, M;Yuta, S
提出了一种新的层析重建方法，该方法允许从部分截断的扫描数据重建切片内的感兴趣区域。该方法利用了两种类型的源数据，即一系列截断投影和物体横截面的轮廓。该算法的原理是根据其他视角的投影数据和物体的轮廓数据来估计一个投影中的截断面积。上述估计是通过以下两个重复过程来完成的：1)修改每次与已测量的截断区域的投影数据相比较的计算投影数据，以及2)修改每次也与对象的形状相比较的重建图像。计算机仿真结果表明，该算法的结果是收敛的，从而验证了该算法的有效性，经过迭代处理后的重建图像具有良好的质量。
A new tomographic reconstruction method is proposed which permits the reconstruction of a region of interest within a slice from partially truncated scanning data. This method utilizes two types of source data, namely a series of truncated projections and the outline of the object's cross section. The principle of this algorithm is to estimate the outside area of truncation in one projection from the projection data of the other viewing angles and the outline data of the object. The above estimation is accomplished by following two repeated procedures: 1) the modification of the calculated projection data compared each time with the already measured projection data of the truncated area, and 2) the modification of the reconstructed image compared also each time with the shape of the object. Computer simulation shows the convergence of the results obtained by this algorithm thus verifying its validity, and a reconstructed image after iterative processes exhibits good quality.