Cervi P M, Bighi S, Merlo L, Lupi L, Vita G
Department of Radiology, S. Anna Hospital, Ferrara, Italy.
Ann Radiol (Paris). 1990;33(6):321-8.
The authors describe a computed radiographic system employed to generate and archive digital images in intravenous urography. For each exposure the system produces two digital images: the first (left image) simulates a conventional screen-film radiograph, the second (right image); enhances some spatial frequencies and emphasizes the margins of the structures. These images can be modified in their chief parameters and then printed by a laser-printer and archived on optical disks. Four experienced radiologists evaluated digital images with regard to some chief diagnostic parameters and, in 50 patients, they compared digital images with conventional screen-film radiographs and submitted the results to statistical analysis. For some of the chosen parameters, particularly for the evaluation of renal margins before and after contrast medium injection, digital images gave statistically better results than conventional films, while, no statistically significant different was observed for the other parameters. From the results of this preliminary study digital radiography was found to be useful in intravenous urography by reducing the patient's exposition dose, by always obtaining images of good quality, and by enhancing some particular features of the standard image; on the other hand there were many unsolved problems regarding the communicating and archiving system (PACS), because of the slowness of the image transfer procedure, difficulties in data transmission and complexity of referential procedures.
作者描述了一种用于静脉肾盂造影中生成和存档数字图像的计算机射线照相系统。每次曝光时，该系统会生成两张数字图像：第一张（左图像）模拟传统的屏-片射线照片，第二张（右图像）增强了一些空间频率并突出了结构的边缘。这些图像的主要参数可以修改，然后由激光打印机打印并存储在光盘上。四位经验丰富的放射科医生根据一些主要诊断参数对数字图像进行了评估，并且在50名患者中，他们将数字图像与传统的屏-片射线照片进行了比较，并将结果进行了统计分析。对于某些选定的参数，特别是在评估注射造影剂前后的肾边缘时，数字图像在统计学上比传统胶片给出了更好的结果，而对于其他参数则未观察到统计学上的显著差异。从这项初步研究的结果来看，发现数字放射摄影在静脉肾盂造影中是有用的，它可以降低患者的照射剂量，始终获得高质量的图像，并增强标准图像的一些特定特征；另一方面，由于图像传输过程缓慢、数据传输困难以及参考程序复杂，在通信和存档系统（PACS）方面存在许多未解决的问题。
