Jurkoshek Amanda M, da Costa Ronaldo C, Martin-Vaquero Paula
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, 43210, USA.
Vet Radiol Ultrasound. 2015 Sep-Oct;56(5):503-10. doi: 10.1111/vru.12260. Epub 2015 Apr 14.
Computed tomography (CT) scans can be acquired with the transverse images aligned either parallel to the endplates or perpendicular to the vertebral canal. The purpose of this prospective cross-sectional study was to determine the effect of angle acquisition on CT morphometric evaluation of the cervical vertebral column of Great Danes with and without cervical spondylomyelopathy. Twenty-eight Great Danes (13 normal, 15 affected) were sampled. For each dog, a set of CT images was acquired with the transverse slices aligned parallel to the endplates and another one with the transverse images aligned perpendicular to the vertebral canal. For each different set, transverse slices from the cranial, middle, and caudal aspects of the individual vertebral bodies C2-C7 were measured. Height, width, transverse area, right dorsal to left ventral height (RDLV), and left dorsal to right ventral height (LDRV) were recorded by a single observer at each location. For both affected and control dogs, significant differences between the measurements obtained from the two sets of transverse images were found only at the cranial aspect of the vertebrae (P = 0.005, P < 0.001, P < 0.001, P = 0.005, and P = 0.010 for height, width, area, RDLV, and LDRV, respectively). Measurements for the middle and caudal aspects did not differ. The funnel-shape morphology of the cervical vertebral foramina in Great Danes with stenosis of their cranial aspect may be responsible for the significant differences found. Considering that the morphometric parameters were significantly affected by CT slice angle in the current study, authors recommend that a standardized scanning protocol be followed when morphometric evaluations using CT are planned.
计算机断层扫描（CT）可以获取横向图像，这些图像可以与终板平行或与椎管垂直对齐。这项前瞻性横断面研究的目的是确定角度采集对患有和未患有颈椎脊髓病的大丹犬颈椎CT形态学评估的影响。对28只大丹犬（13只正常，15只患病）进行了采样。对于每只狗，采集一组横向切片与终板平行的CT图像，以及另一组横向图像与椎管垂直的CT图像。对于每组不同的图像，测量C2-C7椎体的头侧、中间和尾侧的横向切片。由一名观察者在每个位置记录高度、宽度、横截面积、右背侧到左腹侧高度（RDLV）和左背侧到右腹侧高度（LDRV）。对于患病和对照犬，仅在椎体的头侧方面，从两组横向图像获得的测量值之间存在显著差异（高度、宽度、面积、RDLV和LDRV的P值分别为0.005、<0.001、<0.001、0.005和0.010）。中间和尾侧方面的测量值没有差异。头侧狭窄的大丹犬颈椎椎间孔的漏斗形形态可能是造成显著差异的原因。考虑到在本研究中形态学参数受CT切片角度的显著影响，作者建议在计划使用CT进行形态学评估时遵循标准化的扫描方案。
