An improved PI-method for reconstruction from helical cone-beam projections
An improved PI-method for reconstruction from helical cone-beam projections
复制标题
螺旋锥束投影重建的改进 PI 方法
DOI：
10.1109/nssmic.1999.845801
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
P. Danielsson
中科院分区：
文献类型：
--
作者：
H. Turbell;P. Danielsson
针对一维滤波的相干性问题，提出了一种改进的PI滤波方法。PI表面由同时进入和离开探测器边缘的物点定义。在这些事件之间，PI表面被投影到检测器上，不完全是沿着完美的线，但是尽管如此，大多数点沿着某个非水平线集中。作者表明，一维滤波沿着这些倾斜的线条，大大提高了图像质量。
Aiming for a more coherent 1D-filtering, the authors propose an improvement of the original PI-method. A PI-surface is defined by the object points which enter and exit over detector edges simultaneously. In between these to events the PI-surface is projected onto the detector, not quite along a perfect line, but nevertheless with most of the points concentrated along a certain non-horizontal line. The authors show that one-dimensional filtering along these slanted lines improves the image quality considerably.