Porat-Mosenco Yael, Schwarz Tobias, Kass Philip H
Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, 3900 Delancey Street, Philadelphia, PA 19104-6010, USA.
Vet Radiol Ultrasound. 2004 Mar-Apr;45(2):131-5. doi: 10.1111/j.1740-8261.2004.04021.x.
Computed tomography (CT) of the caudal fossa of 10 canine and nine equine cadaver heads was performed with conventional slice widths of 5 and 10 mm, respectively, and with thin collimations of 1 and 2 mm, respectively. Reformatting of thinly collimated slices was done by addition of thinly collimated slices to section thicknesses of 5 and 10 mm, respectively. Seventy-six pairs of conventional and reformatted images of identical anatomic locations were evaluated for magnitude of skull-base-related artifacts and image noise. A film-based subjective evaluation of artifact and noise was performed by four radiologists on a five-point score system. There was a statistically significant reduction of artifacts of canine and equine heads by 33% and 50%, respectively, on reformatted images compared with conventional ones but no difference in image noise. On objective artifact assessment based on the magnitude of standard deviation of attenuation values in the interpetrosal region, there was a statistically significant reduction of artifacts of canine and equine heads by 23% and 39%, respectively, on reformatted images. Thick-section reformatting significantly improves image quality of CT scans of the caudal fossa in dogs and horses.
对10个犬类和9个马类尸体头部的颅后窝进行了计算机断层扫描（CT），常规切片厚度分别为5毫米和10毫米，薄层准直分别为1毫米和2毫米。通过将薄层准直切片分别添加到5毫米和10毫米的切片厚度来对薄层准直切片进行重新格式化。对76对相同解剖位置的常规图像和重新格式化图像进行了颅底相关伪影和图像噪声大小的评估。四位放射科医生采用五分制评分系统对伪影和噪声进行了基于胶片的主观评估。与传统图像相比，重新格式化后的图像上犬类和马类头部的伪影分别显著减少了33%和50%，但图像噪声没有差异。基于岩间区域衰减值标准差大小的客观伪影评估显示，重新格式化后的图像上犬类和马类头部的伪影分别显著减少了23%和39%。厚层切片重新格式化显著提高了犬类和马类颅后窝CT扫描的图像质量。
