Wieners Gero, Detert Jacqueline, Streitparth Florian, Pech Maciej, Fischbach Frank, Burmester Gerd, Ricke Jens, Backhaus Marina, Bruhn Harald
Department of Radiology and Nuclear Medicin, Otto-von-Guericke-University, Leipziger Str. 44, 39120 Magdeburg, Germany.
Eur Radiol. 2007 Aug;17(8):2176-82. doi: 10.1007/s00330-006-0539-0. Epub 2007 Jan 12.
The goal of this study was to compare magnetic resonance (MR) image quality at different field strengths for evaluating lesions in wrist and finger joints of patients with rheumatoid arthritis (RA) in order to determine whether the higher field strength provides diagnostic gain. The hand mainly affected in 17 RA patients was examined at 1.5 Tesla (T) and 3.0 T with comparable MR imaging (MRI) protocols. MR images were reviewed twice by two experienced radiologists using the Rheumatoid Arthritis MRI Scoring System (RAMRIS) of the OMERACT (Outcome Measures in Rheumatoid Arthritis Clinical Trials) group. Image quality was rated on a five-point scale using Friedmann's test and Kendall's W-test for statistical analysis. Image comparison revealed better image quality at higher field strength. Image quality of T1-weighted images was rated 14-22% better at 3.0 T compared with 1.5 T by both readers. Moreover, the rating for the T2-weighted-images acquired at 3.0 T was one point better in the five-point scale used. Inter-reader correlation for image quality, bone erosions/defects, edema and synovitis ranged between 0.6 and 0.9 at 3.0 T and between 0.6 and 0.8 at 1.5 T. Intra-reader correlation for these parameters was high at 0.8-1.0. MRI image quality of RA hands is superior at 3.0 T, while an acceptable image quality is achieved at 1.5 T, which improves the evaluation of extent of bone edema, synovitis and identification of small bone erosions.
本研究的目的是比较不同场强下的磁共振（MR）图像质量，以评估类风湿性关节炎（RA）患者腕关节和手指关节的病变，从而确定更高的场强是否能带来诊断优势。对17例主要手部受累的RA患者，采用可比的磁共振成像（MRI）方案，分别在1.5特斯拉（T）和3.0 T场强下进行检查。两名经验丰富的放射科医生使用类风湿性关节炎临床试验结果评估（OMERACT）组的类风湿性关节炎MRI评分系统（RAMRIS）对MR图像进行了两次评估。使用弗里德曼检验和肯德尔W检验对图像质量进行五点量表评分以进行统计分析。图像比较显示，在更高场强下图像质量更好。两位阅片者均认为，与1.5 T相比，3.0 T时T1加权图像的质量评分高出14 - 22%。此外，在使用的五点量表中，3.0 T采集的T2加权图像评分高出一分。3.0 T时图像质量、骨侵蚀/缺损、水肿和滑膜炎的阅片者间相关性在0.6至0.9之间，1.5 T时在0.6至0.8之间。这些参数的阅片者内相关性较高，为0.8 - 1.0。RA手部的MRI图像质量在3.0 T时更佳，而在1.5 T时也能达到可接受的图像质量，这有助于提高对骨水肿范围、滑膜炎以及小骨侵蚀识别的评估。
