Harpen M D
Department of Radiology, Mobile, Alabama 36617, USA.
Med Phys. 1999 Nov;26(11):2231-4. doi: 10.1118/1.598778.
Presented is a simple model describing the dependence of image noise in computed tomography on the x-ray beam profile. The model is used to derive the x-ray profile which minimizes total image noise at constant integral patient dose. The profile may be produced with a bow-tie-type beam shaping filter. Results of the analysis are validated using a computer simulation of computed tomography (CT) acquisition and reconstruction.
本文提出了一个简单模型，用于描述计算机断层扫描中图像噪声与X射线束轮廓的依赖关系。该模型用于推导在患者积分剂量恒定的情况下使总图像噪声最小化的X射线轮廓。该轮廓可以通过蝴蝶结型束整形滤波器产生。使用计算机断层扫描（CT）采集和重建的计算机模拟对分析结果进行了验证。
