多层平板探测的X射线多能成像方法  

X-ray Multi-energy Imaging Method Using Multi-layer Flat Panel Detector

作　　者：王宗朋 蓝重洲 文敏儒 叶超 WANG Zongpeng;LAN Chongzhou;WEN Minru;YE Chao(Shenzhen Angell Technology Co.,Ltd.,Shenzhen,Guangdong 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,广州510006

出　　处：《光子学报》2021年第9期215-223,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11804057)。

摘　　要：提出一种使用多层平板探测器获取X射线多能图像的成像方法。分别给出单层、多层平板探测器结构,并介绍多层平板探测成像系统工作原理。阐明X射线成像原理,并通过仿真探究单能射线切换下的双能成像、双能减影原理。进一步分析不同kVp,滤过下X射线源的频谱变化,在kVp切换成像试验中多次曝光采集胸部体模低、中、高三能图像,发现胸模多能图像中肋骨、肺部区域存在差异,且对多能图像双能减影可实现骨骼增强、抑制。类似地仿真探究单次曝光下双能射线在双层平板中双能成像、减影原理。给出射线源在不同滤过下的能谱变化,在多层平板成像试验单次曝光中分别使第一层、第三层平板采集胸部体模低、高能图像。发现多层平板采集的低、高能图像中肋骨、肺部区域亦存在差异,对其双能减影亦可实现骨骼增强、抑制。试验表明使用多层平板探测可实现X射线多能成像。An imaging method that uses multi-layer flat panel detector to acquire X-ray multi-energy images is proposed.Single layer,multi-layer flat panel detector structure is introduced,as well as multilayer flat panel detector detection imaging system mechanism.X-ray imaging principle is explained,dual energy imaging,subtraction principles are studied by performing single energy X-ray switching simulation with twice shots.Furthermore,different kVp,filters induced X-ray energy spectrum is analyzed,and low,medium,high energy chest phantom images are acquired by performing kVp switching experiment with several shots.Results show that multi-energy images of chest phantom exhibit difference between rib and lung region,and bone enhancement,suppression can be realized by performing dual energy subtract to multi-energy images.Similarly dual energy imaging,subtraction principles are studied by performing dual energy X-ray excited dual layer flat panel detector imaging simulation with single shot.Same kVp with different filter combination induced X-ray energy spectrum is analyzed,multi-layer flat panel detector imaging experiment with single shot is performed,and low,high energy chest phantom images are acquired by first,third layer flat panel detector.Results show that low,high energy images also exhibit difference between rib and lung region,bone enhancement,suppression can also be realized by performing dual energy subtraction.Experiment result proves that X-ray multi-energy imaging using multi-layer flat panel detector detection method is practicable.

关 键 词：X射线 多层平板探测器 多能成像 双能减影 kVp切换 

分 类 号：TH774[机械工程—仪器科学与技术] TG115.22[机械工程—精密仪器及机械]