Baird D K, Hathcock J T, Rumph P F, Kincaid S A, Visco D M
Department of Radiology, Auburn University, AL, USA.
Vet Radiol Ultrasound. 1998 Mar-Apr;39(2):87-97. doi: 10.1111/j.1740-8261.1998.tb01972.x.
Low-field magnetic resonance imaging (MRI) was performed on the stifle joints of four normal adult mongrel dogs using a 0.064 Tesla scanner. Markers were placed on each stifle joint to serve as reference points for comparing gross sections with the images. A T1-weighted sequence was used to image one stifle joint on each dog in the sagittal plane and the other stifle joint in the dorsal plane. The dogs were euthanized immediately following MRI and the stifle joints frozen intact. Each stifle joint was then embedded in paraffin, again frozen, and sectioned using the markers as reference points. On T1-weighted images, synovial fluid had low signal intensity (dark) compared to the infrapatellar fat pad which had a high signal intensity (bright). Articular cartilage was visualized as an intermediate bright signal and was separated from trabecular bone by a dark line representing subchondral bone. Menisci, fibrous joint capsule, and ligamentous structures appeared dark. In the true sagittal plane, the entire caudal cruciate ligament was often seen within one image slice. The patella was visualized as an intermediate bright signal (trabecular bone) surrounded by a low intensity signal (cortical bone). The trochlea and the intercondylar notch were difficult areas to analyze due to signal volume averaging of the curved surface of these areas and the presence of several types of tissues.
使用0.064特斯拉扫描仪对4只正常成年杂种犬的膝关节进行了低场磁共振成像（MRI）检查。在每个膝关节上放置标记物，作为将大体切片与图像进行比较的参考点。使用T1加权序列在矢状面成像每只犬的一个膝关节，在背平面成像另一个膝关节。MRI检查后立即对犬实施安乐死，并将膝关节完整冷冻。然后将每个膝关节包埋在石蜡中，再次冷冻，并以标记物作为参考点进行切片。在T1加权图像上，与具有高信号强度（明亮）的髌下脂肪垫相比，滑液具有低信号强度（暗）。关节软骨显示为中等明亮信号，并通过代表软骨下骨的暗线与小梁骨分开。半月板、纤维关节囊和韧带结构呈暗色。在真正的矢状面中，整个后交叉韧带通常在一个图像切片中可见。髌骨显示为中等明亮信号（小梁骨），周围是低强度信号（皮质骨）。由于这些区域曲面的信号体积平均以及存在多种类型的组织，滑车和髁间切迹是难以分析的区域。
