Eraso F E, Ludlow J B, Platin E, Tyndall D, Phillips C
Nova Southeastern University, College of Dental Medicine, Department of Oral Medicine, Fort Lauderdale, Fla 33328, USA.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1999 Apr;87(4):518-23. doi: 10.1016/s1079-2104(99)70255-6.
Automatic exposure control has been used successfully in medicine to improve image quality and reduce the number of retakes necessitated by inadequate operator selection of exposure factors. The purpose of this study was to assess the influence of automatic exposure control on panoramic image quality.
A total of 352 patients were imaged with either the OP 100 or the Orthophos Plus panoramic machine. An expert consensus panel judged film quality using a 5-point scale. Differences in quality that would have resulted from the use of operator-determined exposures were calculated through use of an algorithm validated with test images of a human phantom.
McNemar's test demonstrated significant improvements in quality with automatic exposure control (P = .001) in comparison with manual exposure control. No quality difference was found between the 2 machines (P = .9661). Manual exposure selection by oral and maxillofacial radiology residents was better than selection by technologists and assistants (P = .006).
This study confirms the utility of automatic exposure control for panoramic radiography.
自动曝光控制已在医学领域成功应用，以提高图像质量并减少因操作员对曝光因素选择不当而导致的重拍次数。本研究的目的是评估自动曝光控制对全景图像质量的影响。
共有352名患者使用OP 100或Orthophos Plus全景机进行成像。一个专家共识小组使用5分制对胶片质量进行评判。通过使用经人体模型测试图像验证的算法，计算出使用操作员确定的曝光量所导致的质量差异。
与手动曝光控制相比，McNemar检验显示自动曝光控制在质量上有显著改善（P = 0.001）。两台机器之间未发现质量差异（P = 0.9661）。口腔颌面放射科住院医师手动选择曝光优于技术人员和助手（P = 0.006）。
本研究证实了自动曝光控制在全景放射摄影中的实用性。
