Murray R C, Mair T S, Sherlock C E, Blunden A S
Animal Health Trust, Lanwades Park, Kentford, Newmarket CB8 7UU, UK.
Vet Rec. 2009 Sep 5;165(10):281-8. doi: 10.1136/vr.165.10.281.
Eleven limbs taken postmortem from 10 lame horses were examined by MRI in a low-field 0.27T system designed for standing horses and a high-field 1.5T system used to examine anaesthetised horses. Nine limbs were examined in the foot/pastern region and two in the fetlock region, and the results were compared with gross pathological examinations and histological examinations of selected tissues. The appearance of normal tissues was similar between the two systems, but the anatomical arrangement of the structures was different due to differences in positioning, and a magic angle artefact was observed at different sites in some imaging sequences. Articular cartilage could be differentiated into two articular surfaces in most joints in the high-field images but could generally be separated only at the joint margins in the low-field images. Abnormalities of tendon, ligament and bone detected by gross examination were detected by both forms of MRI, but some details were clearer on the high-field images. Articular cartilage found to be normal on pathological examination was also classified as normal on MRI, but lesions in articular cartilage detected on pathological examination were identified only by high-field MRI. An abnormality was detected on MRI of all the limbs that had abnormal navicular flexor fibrocartilage on pathological examination.
从10匹跛马身上取下的11条肢体在一台专为站立马匹设计的0.27T低场系统和一台用于检查麻醉马匹的1.5T高场系统中进行了MRI检查。9条肢体在蹄/球节区域进行了检查，2条在系关节区域进行了检查，并将结果与选定组织的大体病理学检查和组织学检查进行了比较。两种系统中正常组织的外观相似，但由于定位不同，结构的解剖排列有所差异，并且在一些成像序列的不同部位观察到了魔角伪影。在高场图像中，大多数关节的关节软骨可分为两个关节面，但在低场图像中通常只能在关节边缘处分开。大体检查发现的肌腱、韧带和骨骼异常在两种形式的MRI中均能检测到，但高场图像上的一些细节更清晰。病理检查发现正常的关节软骨在MRI上也被分类为正常，但病理检查发现的关节软骨病变仅通过高场MRI识别。病理检查发现舟状屈肌纤维软骨异常的所有肢体在MRI上均检测到异常。
