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Cone-beam correction for 3rd generation multislice CT

机译:第3代MultiSlice CT的锥形束校正

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We first describe a rigorous adaptation of the circular source trajectory cone-beam algorithm [1] ("FDK") to the third-generation, helical multislice CT geometry. We then describe two practical implementations, one designed to get high image quality (HQ) and the other for high speed patient coverage (HS). Exact conversion of FDK to 3rd generation geometry requires 1) interpolation of projection data onto planar projections and 2) new kernel and pre- and post-convolution weights for the filter. For small cone-angles, an approximation leads to an implementation similar to the current (flat-panel) FDK algorithm and data flow. Comparison of preliminary results with helical weighting approaches which ignore the cone angle altogether [2-5] demonstrate significant image quality improvement, even for the small cone-angles associated with current multislice systems.
机译:我们首先描述了对第三代螺旋多层CT几何的圆形源轨迹锥形算法[1](“FDK”)的严格适应。然后,我们描述了两个实际实现,一个设计用于获得高图像质量(HQ),另一个用于高速患者覆盖(HS)。 FDK至第3代几何形状的精确转换需要1)投影数据的插值到平面投影和2)滤波器的新内核和卷积后权重。对于小锥角,近似导致类似于电流(平板)FDK算法和数据流的实现。利用螺旋加权方法比较忽略锥角的螺旋加权方法[2-5]展示了显着的图像质量改善,即使对于与当前的多层系统相关的小锥形角度。

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