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目的:探讨颞下颌关节张口位磁共振动态成像在颞下颌关节盘前移位中的诊断价值。方法:对30例有颞下颌关节疼痛或弹响MRI患者60侧颞下颌关节行常规MRI静态扫描,并用快速自旋回波扫描获得开口度为0.5㎝的图像,依次进行到患者达到最大开口位。然后采用模拟动态观察。分别由两名专科医师对动态扫描和常规静态扫描时关节盘移位进行诊断,并比较诊断结果。结果:静态MRI检查中关节盘可复性前移位21侧,关节盘不可复性前移位18侧,关节盘侧向移位2例,位置正常19例。动态MRI检查中关节盘可复性前移位23侧,关节盘不可复性前移位19侧,位置正常18例。结论:张口位动态MRI联合静态MRI观察对髁突、关节盘运动功能的评价非常重要,对区别可复性与不可复性关节盘前移位具有重要作用。
Objective: To investigate the diagnostic value of dynamic MR imaging of temporomandibular joint in oral temporomandibular joint. Methods: Thirty patients with temporomandibular joint underwent TMJ static scans of 30 patients with temporomandibular joint pain or snapping MRI. The images with 0.5 开 opening were obtained by rapid spin echo scan and reached the maximum opening position in turn. Then use simulation dynamic observation. Two specialists diagnosed disc displacement during dynamic and routine static scans, respectively, and compared diagnostic results. Results: In the static MRI examination, the articular disc can be retroactively displaced in 21 sides, the disc in the articular disc can not be retroactively displaced in 18 sides, the articular disc in lateral shift in 2 cases, and the position normal in 19 cases. In the dynamic MRI examination, the disc of the articular disc can be refracted before the shift of 23 sides, the disc of the disc can not be retroposed before the shift of 19 sides and the position is normal. Conclusion: The dynamic MRI combined with static MRI in the observation of condylar and disc motion function evaluation is very important. It plays an important role in differentiating the irreversible and anterior disc displacement.