Nordberg C C, Johnson K A
University of Wisconsin-Madison, School of Veterinary Medicine, Department of Surgical Sciences, USA.
Vet Radiol Ultrasound. 1999 Mar-Apr;40(2):128-36. doi: 10.1111/j.1740-8261.1999.tb01897.x.
Magnetic resonance imaging was conducted on previously frozen left carpi from six normal dogs using a 1.5 Tesla magnet in combination with a transmit/receive wrist coil. Three-millimeter thick T1-weighted spin-echo images and 1-mm thick T2*-weighted gradient-recalled 3-D images were obtained in dorsal and sagittal planes. Carpi were embedded, sectioned, and stained. Anatomic structures on the histologic sections were correlated with the MR images. All of the carpal ligaments plus the radioulnar articular disc and the palmar fibrocartilage were identified on MR images. The accessorio-quartile ligament, which had not been well described previously in dogs, was also identified. It originated on the accessory carpal bone and inserted on the fourth carpal bone. The T2*-weighted gradient echo imaging technique provided better images than T1-weighted technique, largely because thinner slices were possible (1 mm vs. 3 mm), resulting in less volume averaging of thin ligaments with surrounding structures. Although MRI is currently the imaging modality of choice to identify ligamentous injury in humans, further studies are needed to determine if abnormalities can be detected in canine carpal ligaments using MRI.
使用1.5特斯拉磁体结合发射/接收腕部线圈，对6只正常犬先前冷冻的左腕关节进行磁共振成像。在背侧和矢状面获得了3毫米厚的T1加权自旋回波图像和1毫米厚的T2加权梯度回波三维图像。腕关节被包埋、切片和染色。组织学切片上的解剖结构与磁共振图像相关联。在磁共振图像上识别出了所有腕部韧带以及桡尺关节盘和掌侧纤维软骨。还识别出了先前在犬中未得到充分描述的副四分位韧带。它起于副腕骨，止于第四腕骨。T2加权梯度回波成像技术提供的图像比T1加权技术更好，这主要是因为可以采用更薄的切片（1毫米对3毫米），从而减少了细韧带与周围结构的容积平均效应。虽然目前磁共振成像（MRI）是识别人类韧带损伤的首选成像方式，但还需要进一步研究以确定是否可以使用MRI检测犬腕部韧带的异常情况。
