University Teaching Hospital, Department for Birds and Reptiles, University of Leipzig, An den Tierkliniken 17, 04103, Leipzig, Germany.
Department for Companion Animals and Horses, University Clinic for Small Animals, Clinical Unit of Diagnostic Imaging, University of Veterinary Medicine Vienna (Vetmeduni Vienna), Veterinärplatz 1, 1210, Vienna, Austria.
Sci Rep. 2019 Jul 11;9(1):10057. doi: 10.1038/s41598-019-46546-5.
This method comparison study used radiographs of 20 mice and 20 budgerigars to investigate comparability between computed radiography (CR) and high-resolution screen-film systems and study the effects of reduced radiation doses on image quality of digital radiographs of small patients. Exposure settings used with the mammography screen-film system (SF) were taken as baseline settings. A powder-based storage-phosphor system (CR) and a needle-based storage-phosphor system (CR) were used with the same settings (D/100%) and half the detector dose (D/50%). Using a scoring system four reviewers assessed five criteria per species covering soft tissue and bone structures. Results were evaluated for differences between reviewers (interobserver variability), systems and settings (intersystem variability, using visual grading characteristic analysis). Correlations were significant (p ≤ 0.05) for interobserver variability in 86.7% of the cases. Correlation coefficients ranged from 0.206 to 0.772. For mice and budgerigars, the CR system was rated as superior to the SF and CR system for most criteria, being significant in two cases each. Comparing the SF and CR system, the conventional method scored higher for all criteria, in one case significantly. For both species and both digital systems, dose reduction to 50% resulted in significantly worse scores for most criteria. In summary, the needle-based storage-phosphor technique proved to be superior compared to the conventional storage-phosphor and mammography screen-film system. Needle-based detector systems are suitable substitutes for high-resolution screen-film systems when performing diagnostic imaging of small patients. Dose reduction to 50% of the corresponding dose needed in high-resolution film-screen systems cannot be recommended.
本方法比较研究使用了 20 只老鼠和 20 只虎皮鹦鹉的射线照片，以研究计算机射线照相（CR）和高分辨率屏片系统之间的可比性，并研究降低小患者数字射线照片的放射剂量对图像质量的影响。采用乳腺屏片系统（SF）的曝光设置作为基准设置。使用基于粉末的存储磷光体系统（CR）和基于针的存储磷光体系统（CR），设置相同（D/100%），探测器剂量减半（D/50%）。四位审阅者使用评分系统，对每个物种的五个标准（涵盖软组织和骨结构）进行评估。对审阅者之间（观察者间变异性）、系统和设置之间（使用视觉分级特性分析的系统间变异性）的差异进行结果评估。在 86.7%的情况下，观察者间变异性的相关性具有统计学意义（p≤0.05）。相关系数范围从 0.206 到 0.772。对于老鼠和虎皮鹦鹉，CR 系统在大多数标准下优于 SF 和 CR 系统，每种情况下均有两个。与 SF 和 CR 系统相比，传统方法在所有标准上的评分均较高，一种情况下具有统计学意义。对于两种物种和两种数字系统，剂量减少到 50%会导致大多数标准的评分显著降低。总之，与传统的存储磷光体和乳腺屏片系统相比，基于针的存储磷光体技术表现出优越性。当对小患者进行诊断成像时，基于针的探测器系统是高分辨率屏片系统的合适替代品。不建议将相应的高分辨率胶片屏系统剂量减少到 50%。
