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TRUNCATION ARTIFACTS IN TOMOGRAPHIC RECONSTRUCTIONS FROM PROJECTIONS

机译:投影重建中的截断伪像

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The artifacts in tomographic reconstructions from truncated sets of projections are analyzed. The shift-variant impulse response of the tomographic system for parallel-beam geometry is derived. A number of propositions are made describing the observed artifacts. A graphical scheme for the prediction of the location and shape of the truncation artifacts is presented and applied to reconstructions from simulated projections. The artifact analysis is applied to images obtained with the commonly used convolution backprojection reconstruction algorithms, and it is extended to reconstructions from fan-beam projections. The analysis is performed for the continuous imaging domain so as to separate the clipping artifacts clearly from those attributed to the digital implementation of the reconstruction algorithms. [References: 23]
机译:分析了从截断的投影集中进行的层析成像重建中的伪影。得出了层析成像系统对平行光束几何形状的位移变量脉冲响应。许多命题描述了观察到的假象。提出了一种用于预测截断伪影的位置和形状的图形方案,并将其应用于根据模拟投影进行的重建。伪影分析应用于通过常用卷积反投影重建算法获得的图像,并将其扩展到从扇形束投影进行的重建。对连续成像域执行分析,以便将剪切伪像与归因于重构算法的数字实现的那些明显分离。 [参考:23]

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