基于衰减补偿的CBCT短扫描实时重建方法  

A Real-time Reconstruction Method of CBCT Short Scan Based on Attenuation Compensation

作　　者：杨坪坪 冯汉升 许继伟 杨洋 宋云涛[1,2,3] YANG Pingping;FENG Hansheng;XU Jiwei;YANG Yang;SONG Yuntao(University of Science and Technology of China,Hefei,230026;Hefei CAS Ion Medical and Technical Devices Co.Ltd.,Hefei,230088;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei,230031)

机构地区：[1]中国科学技术大学,合肥市230026 [2]中科离子医学技术装备有限公司,合肥市230088 [3]中国科学院等离子体物理研究所,合肥市230031

出　　处：《中国医疗器械杂志》2021年第3期240-245,共6页Chinese Journal of Medical Instrumentation

基　　金：数字诊疗装备专项(AQ2019YFC010140)。

摘　　要：针对CBCT重建的时效性问题,提出一种CBCT短扫描实时重建方法,同时将新的图像重建衰减补偿算法应用到重建过程中,改进图像质量。在进行单帧采集图像FDK三维重建时,实时计算Parker加权图像,并在反投影过程中应用新的衰减补偿算法完成短扫描Parker加权重建。该方法通过建立采集和重建线程,模拟CBCT同步采集和重建过程,在满足重建质量的前提下,在患者采集完成后1~2 s内即可完成重建,达到快速实时的目的。Aiming at the problem of timeliness of CBCT reconstruction,a CBCT fast short scan reconstruction method is proposed.At the same time,the image reconstruction process in which a new attenuation compensation algorithm is applied to improve image quality.When performing FDK three-dimensional reconstruction of a single-frame acquisition image,the Parker-weighted image is calculated in real time,and a new attenuation compensation algorithm is applied in the back projection process to complete the short scan Parker-weighted reconstruction.This method simulates the CBCT synchronous acquisition and reconstruction process by establishing collection and reconstruction threads.Under the premise of satisfying the reconstruction quality,the reconstruction can be completed within 1 to 2 seconds after the patient collection is completed,which achieves the purpose of real-time.

关 键 词：短扫描 FDK算法 实时重建 衰减补偿算法 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]