手指线圈在手指关节类风湿性关节炎MRI 初步研究

目的：研究健康和类风湿性关节炎(RA)志愿者手指关节 MRI 的主要表现，检验所研制手指线圈的成像效果。方法应用研制的手指线圈，与机器所配的肢体线圈、柔性表面线圈和3英寸(1英寸=2.54 cm)表面线圈，分别对自制的水模型，用同样T2 WI 序列进行扫描，采用单幅图像测量信噪比(SNR)的方法进行比较。应用中指标本(1个手指)并邀请健康志愿者5例(8个手指)和 RA 志愿者18例(22个手指)参与研究。结果手指线圈的 SNR 比3英寸表面线圈高出1.5倍以上，比肢体线圈和柔性表面线圈高出4倍以上。RA 志愿者22个手指中出现17例滑膜炎、10例关节积液、5例骨髓水肿、7例有骨侵蚀和6例腱鞘炎表现。结论手指线圈具有很高的 SNR。

Primary study on finger joints MRI coil and its value in rheumatoid arthritis

Objective To study the MR performances of finger joints with health subjects and rheumatoid arthritis (RA)patients,and to detect the imaging quality of a custom-made finger coil.Methods Finger coil,extremity coil,flexible surface coil and 3 inch surface coil were used to scan the self-made water phantom with similar T2 WI sequence,then the signal to noise ratio (SNR)on single image was measured for the comparison.The middle finger specimen (1 finger)was used for the research,5 healthy volunteers (8 fingers)and 18 RA patients (22 fingers)were also scanned.Results The SNR of finger coil was over 1.5 times higher than that of the 3 inch surface coil and 4 times higher than that of the extremity coil and flexible surface coil.For the 22 fingers with confirmed RA,synovitis was found in 1 7,joint effusion in 10,bone marrow edema in 5,bone erosion in 7 and tenosynovitis in 6.Conclusion The finger coil has higher SNR.