双层平板探测的双能成像检测系统  

Dual energy imaging inspection system using dual layer flat panel detector

作　　者：蓝重洲 王宗朋 文敏儒 LAN Chongzhou;WANG Zongpeng;WEN Minru(Shenzhen Angell Technology Co.,Ltd.,Shenzhen 518000,China;School of Physics&Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]深圳市安健科技股份有限公司,广东深圳518000 [2]广东工业大学物理与光电工程学院,广东广州510006

出　　处：《光学精密工程》2022年第4期372-379,共8页Optics and Precision Engineering

基　　金：国家自然科学基金项目(No.11804057)。

摘　　要：本文提出一种使用双层平板探测器单次曝光获取X射线双能图像,并实现双能减影的成像检测方法。介绍了单层平板、双层平板探测器结构以及双层平板探测成像系统工作原理。仿真分析不同、相同管电压在不同滤过下X射线的能谱变化,进一步通过试验分别探究使用kVp切换,双层平板方案时胸部体模双能成像特性。研究发现kVp切换、双层平板方案采集的双能图像皆可表征人体软组织、骨骼对低能、高能射线的衰减差异,双能平板方案较kVp切换还具有无运动伪影,剂量较低的优势。提出了一种适用于双层平板的双能图像配准方案,配准后的低、高能图像经双能减影后得到骨骼增强、骨骼抑制图像。试验结果表明双层平板获取的双能减影图像可提升医生诊断时的视觉效果,减影图像对比度优于kVp切换方案。A dual energy imaging inspection method is proposed,which uses dual layer flat panel detector(FPD)to acquire X-ray dual energy images under single exposure,and dual energy subtraction is per⁃formed.Single layer,dual layer FPD structures are introduced,and the principle of dual layer FPD imag⁃ing is detailed as well.Different and same tube voltage with different filters induced X-ray spectra are simu⁃lated,and dual energy image characteristics of chest phantom are analyzed by performing kVp switching,dual layer FPD imaging tests.The results show that dual energy images captured by kVp switching,dual layer FPD can represent attenuation difference of soft tissue,bone with respect to low,hight energy X-rays.Dual layer FPD method owns advantages of lower exposure dose and no motion artifacts compared to kVp switching.Finally,dual energy image registration method for dual energy FPD is proposed,and bone enhanced and bone suppressed images are acquired by performing dual energy subtraction after registration.Experiment results show dual energy subtraction images using dual layer flat panel detector can realize better visualization for doctors’diagnosis,and the subtracted images present better contrast than kVp switching method does.

关 键 词：双能成像 双层平板 双能减影 图像配准 

分 类 号：TH774[机械工程—仪器科学与技术] TP751.1[机械工程—精密仪器及机械]