一种X射线射束硬化校正方法  

A Correction Method of X-ray Beam Hardening

作　　者：张秀琰 陈明 郑永果 ZHANG Xiu-yan;CHEN Ming;ZHENG Yong-guo(College of Computer Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;College of Mathematics and Systems Science,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学计算机科学与工程学院,山东青岛266590 [2]山东科技大学数学与系统科学学院,山东青岛266590

出　　处：《软件》2020年第2期256-259,共4页Software

摘　　要：在医学CT成像系统中,X射线源发出的X射线是多能的,若直接对其进行传统方法的重建,会导致射束硬化,使重建的图像出现“杯状”或“条状”伪影,降低图像质量,干扰诊断等问题,因此需要对CT硬化伪影进行校正。本文提出了一种射束硬化伪影的校正方法,利用近似材料衰减系数与x射线能量的关系,通过从原始重建图像中减去伪影图像来获得校正后的图像。该方法不需要先验知识。数值实验表明,该方法能有效、快速地校正射束硬化伪影。In the medical CT imaging system,the X-ray from the X-ray source is multi-functional,If we directly reconstruct it with traditional methods,it will lead to beam hardening,make the reconstructed image appear"Cup"or“strip”artifacts,reduce image quality,interfere with diagnosis and other problems,so we need to correct CT hardening artifacts.In this paper,a correction method of beam hardening artifacts is proposed.The corrected image is obtained by subtracting the artifacts from the original reconstructed image by using the relationship between the approximate material attenuation coefficient and the X-ray energy.This method does not need prior knowledge.Numerical experiments show that this method can correct beam hardening artifacts effectively and quickly.

关 键 词：CT图像 射束硬化 伪影校正 多色投影 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]