Cooperative Department of Veterinary Medicine, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan.
Koganei Animal Medical Emergency Center, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan.
Open Vet J. 2024 Mar;14(3):895-901. doi: 10.5455/OVJ.2024.v14.i3.17. Epub 2024 Mar 31.
Radiographic examination of the middle ear in French bulldogs can be challenging due to their small ear cavity and thick walls. Quantifying opacity on radiographic images is required to determine normal or abnormal results.
To quantify the radiographic opacity of the middle ear in French bulldogs and create a threshold for objective diagnosis.
A study was conducted on 32 French Bulldogs using radiographic images. Significant difference tests were performed on the ears of patients with unilateral and bilateral middle ear filling on computed tomography. A threshold was established for detecting left-right asymmetry in the same individuals. In addition, comparisons were made between the filling and nonfilling middle ear groups to establish a threshold of pixel values that could determine single middle ear filling and nonfilling for different patient images.
Significant differences were observed in the left-right difference in max, left-right difference in max-ave, and left-right ratio of max-ave between unilateral and bilateral filling groups. The max-ave left-right ratio had the highest area under the curve value with a cutoff of 1.077% and 92.3% sensitivity. The item that showed a significant difference between middle ear groups with and without filling was corrected for nasopharyngeal pixel values with a cutoff of 1.028% and 85% sensitivity.
Pixel value ratios in the middle ear region can detect asymmetries in ear densities. The max value in the region compared to the same image's nasopharyngeal region can determine the filling. Combining individual ear evaluations and symmetry improves accuracy.
法国斗牛犬的中耳腔较小，壁较厚，因此对其进行放射学检查具有一定挑战性。需要对放射图像上的不透明度进行量化，以确定正常或异常结果。
量化法国斗牛犬中耳的放射不透明度，并创建一个客观诊断的阈值。
对 32 只法国斗牛犬进行了研究，使用放射图像。对单侧和双侧中耳填充的 CT 患者的耳朵进行了显著差异检验。为检测同一个体的左右不对称性建立了一个阈值。此外，还对填充和非填充中耳组进行了比较，以确定不同患者图像中可以确定单侧中耳填充和非填充的像素值阈值。
单侧填充组和双侧填充组之间在 max 左右差异、max-ave 左右差异和 max-ave 左右比方面存在显著差异。max-ave 左右比的曲线下面积值最高，截断值为 1.077%，灵敏度为 92.3%。在有和无填充的中耳组之间，具有显著差异的项目是经鼻咽像素值校正的，截断值为 1.028%，灵敏度为 85%。
中耳区域的像素值比值可以检测耳密度的不对称性。与同一图像的鼻咽区域相比，区域中的 max 值可以确定填充。结合个体耳评估和对称性可提高准确性。
