锥束CT散射抑制方法综述

锥束CT严重的散射伪影极大地降低图像质量,成为限制其发展和应用的关键因素。国内外学者对散射抑制或校正方法已做了很多综述性的报道,但是随着锥束CT系统散射抑制研究的进一步推进,出现了一些新的技术。本文分析了X射线散射对CT成像的影响,对常用的散射抑制方法进行归纳总结,梳理散射校正框架,详细介绍基于投影补偿的散射校正技术和常用的散射估计方法,对目前散射校正的问题进行总结,重点讨论了散射校正对噪声的放大作用,为散射抑制的研究和发展提供借鉴作用。 

The Review of Scatter Suppression Methods in Cone Beam CT

Scatter artifacts in cone beam CT (CBCT) degrades image quality seriously, which limits the development and application of CBCT. Researchers have reviewed scatter suppression or correction methods at home and abroad. However, a few new technologies have appeared along with the advancement of scatter suppression methods. This paper analyses the effects of X-ray scattering to CT imaging and summarizes general scatter suppression methods. Also, the scatter correction framework is combed, in which the projection compensation technique and common scatter estimation methods are introduced particularly. Problems in scatter correction are concluded, in which the magnification of noises in scatter correction is emphasized. It provides use for reference to the research and development in scatter suppression.