减少鼻咽T1WI-IDEAL增强检查图像水-脂分离错换伪影的应用研究  

Application study on reducing water-fat separation swap artifacts in nasopharyngeal T1WI-IDEAL enhanced examination images

作　　者：肖嘉辉 邓文明 喻靖文 李天然 钟贻洪 XIAO Jiahui;DENG Wenming;YU Jingwen;LI Tianran;ZHONG Yihong(Department of Radiology,National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital&Shenzhen Hospital,Chinese Academy of Medical Sciences and Peking Union Medical College,Shenzhen,Guangdong Province 518116,China)

机构地区：[1]国家癌症中心、国家肿瘤临床医学研究中心、中国医学科学院北京协和医学院肿瘤医院深圳医院放射诊断科,广东深圳518116

出　　处：《实用放射学杂志》2025年第3期486-490,共5页Journal of Practical Radiology

基　　金：中国医学科学院肿瘤医院深圳医院院内科研课题(SZ2020QN014,E010222010)。

摘　　要：目的探讨鼻咽T1WI非对称回波三点法水-脂分离技术(T1WI-IDEAL)增强检查图像局部水-脂分离错换伪影(WFS-SA)的解决方法.方法收集使用T1WI-IDEAL参数(A组)进行鼻咽增强检查出现较明显WFS-SA的患者37例,在A组参数基础上修改参数后进行B、C、D组扫描.对4组图像进行主观质量评级,并测量每组图像鼻咽顶后壁、延髓的图像信噪比(SNR);记录4组图像WFS-SA的伪影总层数(TAS)、伪影总面积(TAA)和最大单层伪影面积(SSAA_(max))等指标.采用组内相关系数(ICC)分析2名技师图像质量评级的一致性,并采用单因素方差分析或秩和检验对4组图像的SNR、TAS、TAA和SSAA_(max)等指标进行比较.结果2名技师对修改参数的B、C、D 3组T1WI-IDEAL图像的主观评级一致性较好(ICC=0.721~0.928,P<0.001);3组图像的图像质量评级存在差异(H=45.131,P<0.001),C、D组图像评级高于B组,均存在差异(P<0.001).A、B、C、D 4组T1WI-IDEAL图像的TAS、TAA和SSAA_(max)呈递减趋势,均存在差异(P<0.001);D组延髓层SNR均明显高于A、B组,存在差异(P<0.001).结论缩短回波链长度(ETL)=2并结合使用双匀场框可降低鼻咽T1WI-IDEAL增强检查图像WFS-SA的发生率,改善图像质量.Objective To explore the solution of local water-fat separation swap artifacts(WFS-SA)on nasopharyngeal T1WI-iterative decomposition of water and fat with echo asymmetry and least-squares estimation(T1WI-IDEAL)enhanced examination images.Methods Thirty-seven patients with obvious WFS-SA on nasopharyngeal enhanced examination using the A group T1WI-IDEAL parameters were collected.Scans with modified parameters B,C,and D groups were subsequently performed based on the A group parameters.Subjective ratings of image quality were conducted on the four image groups,and the image signal-to-noise ratio(SNR)of the posterior wall of the nasopharynx and medulla oblongata was quantified.The total number of artifact slices(TAS),total artifact area(TAA),and maximum single-slice artifact area(SSAA_(max))of the WFS-SA in the four image groups were recorded.The consistency of image quality ratings between the two technologists was analyzed via the intraclass correlation coefficient(ICC),and one-way analysis of variance or rank-sum test was used to compare the SNR,TAS,TAA,and SSAA_(max) among the four image groups.Results The subjective rating for modified B,C,and D groups of T1WI-IDEAL images by two technologists was deemed satisfactory(ICC=0.721-0.928,P<0.001).Significant variations in image quality ratings were observed among the three groups(H=45.131,P<0.001),with ratings for C and D groups surpassing those for B group(P<0.001).The TAS,TAA,and SSAA_(max) exhibited a decreasing pattern on T1WI-IDEAL images across A,B,C,and D groups,with statistically significant variances observed among all groups(P<0.001).Moreover,the SNR of the medulla oblongata layer in D group displayed a notably higher value compared to A,B groups,with statistically significant distinctions(P<0.001).Conclusion By combining the reduction of the echo train length(ETL)to 2 with the implementation of a double shimming,the occurrence of WFS-SA on nasopharyngeal T1WI-IDEAL enhanced examination images can be minimized and the overall image quality can be enhanced

关 键 词：鼻咽 水-脂分离 非对称回波三点法水-脂分离技术 伪影 

分 类 号：R762[医药卫生—耳鼻咽喉科] R445.2[医药卫生—临床医学]