Application study on reducing water-fat separation swap artifacts in nasopharyngeal T1WI-IDEAL enhanced examination images
10.3969/j.issn.1002-1671.2025.03.029
- VernacularTitle: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
- Author:
Jiahui XIAO
1
;
Wenming DENG
1
;
Jingwen YU
1
;
Tianran LI
1
;
Yihong ZHONG
1
Author Information
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
- Publication Type:Journal Article
- Keywords:
nasopharyngeal;
water-fat separation;
iterative decomposition of water and fat with echo asymmetry and least-squares estimation;
artifact
- From:
Journal of Practical Radiology
2025;41(3):486-490
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the solution of local water-fat separation swap artifacts(WFS-SA)on nasopharyngeal T1WI-itera-tive 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 param-eters were collected.Scans with modified parameters B,C,and D groups were subsequently performed based on the A group parame-ters.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(SSAAmax)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 SSAAmax 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 surpass-ing those for B group(P<0.001).The TAS,TAA,and SSAAmax 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.
