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目的:探讨磁共振不同扫描方法对膝关节前交叉韧带(anterior curciate ligament,ACL)及后交叉韧带(posterior curciate ligament,PCL)的显示情况,探讨MRI检查在膝关节交叉韧带损伤中的显示价值。方法:选取50例膝关节正常扫描图像,包括常规矢状位、常规冠状位。在此基础上增加斜矢状位(向内侧倾斜15°-20°)、斜冠状位(在斜矢状位图像基础上平行于ACL方向)以及3D序列,观察韧带显示情况,以能否在一幅图像内完整显示作为评价标准。结果:3D序列由于可多方向重建,对于各韧带显示情况均较优秀,能够100%显示各韧带。在对ACL的检查中,常规矢状位显示率为62%,斜矢状位显示率为84%,斜冠状位显示率为100%,常规冠状位无法完整显示;在对PCL的检查中,常规矢状位显示率为100%,斜矢状位显示率为100%,常规冠状位无法完整显示。结论:有条件进行3D序列检查的MRI仪器,3D序列可明显提高韧带显示率,对于各韧带损伤的诊断能提供很好的帮助。无条件做3D序列的,ACL在斜冠状位显示最清,PCL可于任意矢状位清晰观察。
Objective: To investigate the MRI findings of anterior curciate ligament (ACL) and posterior curciate ligament (PCL) in different regions of the knee, and to explore the value of MRI in the diagnosis of knee joint cruciate ligament injury. Methods: 50 normal knee images were selected, including conventional sagittal and conventional coronal planes. On this basis, the sagittal position was increased (15 ° -20 ° to the inside), the oblique coronal position (parallel to the ACL direction on the basis of oblique sagittal images), and the 3D sequence were observed to see whether the ligaments were present or not A complete display within the image as an evaluation criteria. Results: The 3D sequences, due to their multi-directional reconstruction, showed excellent results for each ligament and showed 100% of the ligaments. In the ACL examination, the conventional sagittal display rate was 62%, oblique sagittal display rate of 84%, oblique coronal display rate of 100%, the conventional coronal can not be fully displayed; in the examination of PCL, Conventional sagittal display rate of 100%, oblique sagittal display rate of 100%, the conventional coronal can not be fully displayed. CONCLUSION: MRI equipment and 3D sequences with 3D sequence examination can obviously improve the rate of ligament display, which can be very helpful for the diagnosis of ligament injuries. Unconditionally done 3D sequences, ACL showed the most clear in the oblique coronal, PCL can be clearly observed in any sagittal position.