Boström Anna Fredrika, Lappalainen Anu K, Danneels Lieven, Jokinen Tarja S, Laitinen-Vapaavuori Outi, Hielm-Björkman Anna K
Small Animal Surgery, Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.
Department of Rehabilitation Sciences and Physiotherapy, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium.
Vet Rec Open. 2018 Mar 20;5(1):e000256. doi: 10.1136/vetreco-2017-000256. eCollection 2018.
MRI and CT are frequently used to diagnose spinal diseases in dogs. These modalities have detected epaxial muscle degeneration in dachshunds with intervertebral disc herniation. However, research on the reliability of epaxial muscular measurements is limited in veterinary medicine. The aims of the study were to assess the intrarater and inter-rater reliability of epaxial muscle cross-sectional area (CSA) and fat content measurements on MRI and CT images in dachshunds, and to compare the CSA measurement between the two modalities. MRI and CT images of 10 healthy dachshunds were evaluated. Two blinded observers assessed MRI CSA, MRI fat content, CT CSA and CT muscle attenuation of three thoracolumbar epaxial muscles using OsiriX. The results showed 'substantial' to 'almost perfect' intrarater reliability (intraclass correlation coefficient (ICC) 0.828-0.998) and inter-rater reliability (ICC 0.685-0.854) for all variables. When individual spinal segments were analysed, the intrarater and inter-rater reliability decreased and the confidence intervals increased. There was positive correlation (r= 0.719-0.841, P=0.001) and high agreement (0.824-0.894) for the measured CSA between MRI and CT. Epaxial muscle CSA and fat content can be reliably measured on MRI and CT, bearing in mind that measurement of certain segments requires adequate training.
磁共振成像（MRI）和计算机断层扫描（CT）常用于诊断犬类脊柱疾病。这些检查方式已在患有椎间盘突出症的腊肠犬中检测到轴上肌变性。然而，在兽医学中，关于轴上肌测量可靠性的研究有限。本研究的目的是评估腊肠犬MRI和CT图像上轴上肌横截面积（CSA）和脂肪含量测量的同一评估者内和不同评估者间的可靠性，并比较两种检查方式之间的CSA测量结果。对10只健康腊肠犬的MRI和CT图像进行了评估。两名盲法观察者使用OsiriX软件评估了三只胸腰段轴上肌的MRI CSA、MRI脂肪含量、CT CSA和CT肌肉衰减情况。结果显示，所有变量的同一评估者内可靠性（组内相关系数（ICC）0.828 - 0.998）和不同评估者间可靠性（ICC 0.685 - 0.854）为“实质性”至“几乎完美”。当对单个脊柱节段进行分析时，同一评估者内和不同评估者间的可靠性降低，置信区间增大。MRI和CT测量的CSA之间存在正相关（r = 0.719 - 0.841，P = 0.001）且一致性较高（0.824 - 0.894）。轴上肌CSA和脂肪含量可在MRI和CT上可靠测量，但要记住，对某些节段的测量需要充分的训练。
