加权
冗余(工程)
卷积(计算机科学)
成像体模
算法
探测器
数学
计算机科学
人工智能
光学
物理
声学
人工神经网络
电信
操作系统
作者
Paul S. Cho,Anthony Rudd,Roger H. Johnson
标识
DOI:10.1016/0895-6111(96)00031-6
摘要
In this paper we report cone-beam CT techniques that permit reconstruction from width-truncated projections. These techniques are variants of Feldkamp's filtered backprojection algorithm and assume quasi-redundancy of ray integrals. Two methods are derived and compared. The first method involves the use of preconvolution weighting of the truncated data. The second technique performs post-convolution weighting preceded by non-zero estimation of the missing information. The algorithms were tested using the three-dimensional Shepp-Logan head phantom. The results indicate that given an appropriate amount of overscan, satisfactory reconstruction can be achieved. These techniques can be used to solve the problem of undersized detectors.
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