High resolution MR imaging of the knee at 3T

目的.目的：探讨3.0 T MR机对膝关节的高质量、高分辨率成像。使用3.0-T装置对1具人类尸体和5个猪膝关节进行成像。以0.195x0.39mm的平面内分辨率和约5分钟的采集时间获得T1加权自旋回波图像集。用1.0 T装置对2个猪膝关节进行了相同成像方案的成像，并测量了3 T和1 T图像的信噪比。3-T MR系统提供了膝关节的详细描述。对内侧副韧带的深层及内侧、外侧副韧带下的相关细纤维进行了划分。前交叉韧带的胫骨附着、关节游离缘的不规则性、以及与外侧副韧带和股二头肌肌腱一起形成的联合肌腱的精确显示得到了证明。与1-T单位相比，3-T单位的信噪比提高了1.39 ~ 1.72倍。由于获得详细的图像的潜在优势，3-T MR系统建议的膝关节形态的精细演示的实际效用。

Purpose. To examine the 3.0-T MR unit to obtain high quality, high resolution images of the knee joint.Subjects and Methos. One human cadaveric and five porcine knees were imaged with the 3.0-T unit. Sets of T1-weighted spin echo images were obtained with in-plane resolution of 0.195x0.39mm and an acquisition time of approximately 5min. Two porcine knees were also imaged with the 1.0-T unit with an identical imaging protocol and the signal-to-noise ratios were measured on both images at 3T and 1T.Results. The 3-T MR system provided detailed delineation of the knees. Deep layers of the medial collateral ligament and associated fine fibers beneath the medial and lateral collateral ligament were demarcated. Precise demonstration of the tibial attachment of the anterior cruciate ligament, irregularity of the meniscal free edge, and conjoint tendon formation together with the lateral collateral ligament and the biceps femoris tendon, were demonstrated. Compared to 1-T unit, the signal-to-noise ratio with 3-T was increased by a factor of 1.39 to 1.72.Conclusion. Due to the potential advantage of obtaining detailed images, the 3-T MR system suggests practical utility for fine demonstration of the knee morphology.