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Permissible Deviation of Rotation Center Based on Fan-Beam Projection ICT System

机译：基于扇形光束投影ICT系统的旋转中心允许偏差

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摘要

For ICT wide fan-beam scanning, there is a geometrical supposition that the object rotation center and the radiation source center intersect the image reconstruction center. In practice, the existing intersection deviation has influence on the image reconstruction precision. The image reconstruction mathematical model for shifted rotation center was established, and the relationship between the deviation error and reconstructed image precision was studied by simulation. As a result, for 512×512 CT reconstructed image, there is no distinctive difference between the reference image and the reconstructed image with eccentricity 0.1 pixels; However, with 0.2 pixels or more, the difference is obvious. So, for 512×512 CT image, the maximum permissible deviation of the rotation center is within 0.1 pixel dimension.
机译：对于ICT宽敞的风扇束扫描，物体旋转中心和辐射源中心与图像重建中心相交的几何假设。实际上，现有的交叉偏差对图像重建精度有影响。建立了换档旋转中心的图像重建数学模型，通过模拟研究了偏差误差与重构图像精度的关系。结果，对于512×512 CT重建图像，参考图像与具有偏心率为0.1像素的重建图像之间没有不同的差异;但是，含有0.2像素或更多，差异是显而易见的。因此，对于512×512 CT图像，旋转中心的最大允许偏差在0.1像素尺寸范围内。

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