中国医学装备2024，Vol.21Issue(6)：6-11,6.DOI:10.3969/j.issn.1672-8270.2024.06.002
图像重建算法对兆伏级成像系统图像质量及自动配准精度的影响研究
Study on the influence of reconstruction algorithms of image on the image quality and precision of automatic registration of imaging system with megavolt grade
摘要
Abstract
Objective:To compare and study the improvement of different iterative reconstruction(IR)algorithms of the tomotherapy(TOMO)Radixact system on the image quality of megavoltage computed tomography(MVCT)imaging system,and the influence of that on the precision of automatic registration,and to explore the reconstruction algorithm that is suitable for clinical application.Methods:Using the MVCT imaging system to respectively scan the Tomo-Phantom HE phantom and the Catphan 604 phantom,and to analyze three groups of images were generated by three kinds of reconstruction algorithms,which included the Standard(STD)algorithm,IR General(IR-G)algorithm and IR Soft Tissue(IR-ST)algorithm,in MVCT image.The noise index(NI),uniformity index(UI)of image,modulation transfer function(MTF),low contrast visibility(LCV)index and contrast-to-noise ratio(CNR)of three groups of images were calculated respectively.The Lucy phantom was used to test the accuracy of automatic registration algorithm.The registration data of four dimensions,included left-right(X-axis),head-foot(Y-axis),vertical(Z-axis)and free rotation(Roll)around the Y-axis,were used to conduct verification analysis for the influences of them on the precision of automatic registration.Results:The NI values of IR-G and IR-ST reconstruction algorithms were respectively 39.58±0.10 and 14.62±0.26,which were better than 39.58±0.10 of STD algorithm,and the UI values of them were respectively 19.87±0.83 and 15.84±2.51,which were better than 24.51±1.81 of STD algorithm,and LCV values of them were respectively 2.50±0.03 and 1.74±0.11,which were better than 3.67±0.04 of STD algorithm.All of them appeared significant increase,but the resolution with high contrast of MTF were respectively 0.23 and 0.21,which were lower than 0.32 of STD.The overall image quality of the IR algorithms was superior to that of the STD algorithm.In the accuracy test of the automatic registration algorithm,the registration precisions of IR-G and IR-ST algorithms on Y-axis were respectively(0.360±0.142)mm and(0.245±0.050)mm,which were significantly higher than 0.145±0.136 of STD algorithm,and the differences of them were significant(Z=6.0,15.0,P<0.05).The differences of registration precisions of other directions were not significant(P>0.05).Conclusion:The IR algorithm has advantages in terms of noise,uniformity and resolution with low-contrast,however,it shows reduction on resolution with high-contrast.This reduction of resolution with high-contrast do not lead to the decrease of the precision of automatic registration.关键词
螺旋断层放射治疗/重建算法/兆伏级CT(MVCT)/图像质量/图像自动配准Key words
TomoTherapy/Reconstruction algorithm/Megavoltage computed tomography(MVCT)/Image quality/Reconstruction algorithms分类
医药卫生引用本文复制引用
刘晓宇,陈高翔,阎长鑫,班培超,于洪涛,朱世龙,陈恺文,解传滨..图像重建算法对兆伏级成像系统图像质量及自动配准精度的影响研究[J].中国医学装备,2024,21(6):6-11,6.基金项目
国家重点研发计划(2022YFC2409502,2022YFC2409503) National Key Research and Development Program(2022YFC2409502,2022YFC2409503) （2022YFC2409502,2022YFC2409503）
