正常青年人颞下颌关节盘附着结构的MRI研究

The Structure of temporomandibular joint disk attachment assessed by MR imaging in young asymptomatic volunteers

目的分析正常青年人颞下颌关节盘附着结构的MRI影像表现。方法对25例正常青年人(50个颞下颌关节)行MRI张、闭口斜矢状位质子密度加权像(proton density weighted image,PDWI)扫描,观察颞下颌关节盘附着结构显示率及张、闭口位显示特点。结果颞前附着张、闭口位显示率分别为80%(40/50)、90%(45/50),下颌前附着张、闭口位显示率分别为18%(9/50)、20%(10/50),颞后及下颌后附着张口位显示较好,显示率分别为100%(50/50)、82%(41/50),闭口位不能清晰显示;多数附着结构表现为均匀的线样低信号影。结论 MRI PDWI序列能较好地显示正常颞下颌关节盘附着结构。

Objective To assess the MRI imaging performance of the structure of the temporomandibular joint （TMJ） disk attach- ment in young asymptomatic volunteers. Methods 50 TMJs＇ sagital oblique proton density weighted images （PDWI） were acquired with the young volunteers＇mouth opened and closed. The display ratio and characteristics of the TMJ disk attachment was observed. Re- suits On the opened-and closed-mouth images, the display ratio of the anterior superior attachment was 80% （40/50） and 90% （ （45/50）, while the display ratio of the anterior inferior attachment was 18% （9/50） and 20% （10/50）. The posterior superior and posterior inferior attachment were displayed clearly in the opened-mouth images, the display ratio was 100% （50/50） and 82% （41/ 50） separately,while not recognized on the closed-mouth images. Most of the structure of the attachments were expressed as uniform line-like low signal. Conclusion The structure of TMJ attachment can better displayed on MRI with PDWI sequence.