CT射线动态滤波器研究综述

现代CT系统配置一种蝴蝶结形射线滤波器,用于减小CT检测X射线辐射剂量和调制X射线探测器数据。理想的X射线滤波器,即动态滤波器,与CT扫描过程紧密相关,应能在CT扫描过程中动态地对投影射线进行调制。同时,动态滤波器使各探测通道的采集数据具有较好的一致性,降低探测系统动态范围需求。本文综述了近年国内外动态滤波器的研究现状,介绍了动态滤波器的原理,并重点分析了锥束CT动态滤波器设计理论。最后,对CT射线动态滤波器研究前景进行了展望。

Review of dynamic bowtie filters for CT

The classic bowtie filter for CT is used to shape an x ray beam and equalize its flux reaching different detector channels. An ideal bowtie filter, dynamic bowtie, could dynamically modulate incoming x ray beams with CT scanning as a function of the angle of the x ray with respect to a patient to balance the photon flux on a detector array. In addition, the bowtie filter is expected to be able to make the photons data on the detector array uniform in order to compress the dynamic range. Here, an overview of the progress made in the field of dynamic bowtie is presented, and basic principles of dynamic bowtie which are under the attention are introduced. The design theory of the dynamic bowtie for cone beam CT is discussed. In the end, the prospects for developing trends of the dynamic bowtie are proposed.