影像接收器性能：Trophy RVG UI传感器与柯达Ektaspeed Plus胶片的比较
Image-receptor performance: a comparison of Trophy RVG UI sensor and Kodak Ektaspeed Plus film.
作者信息
Ludlow J, Mol A
机构信息
Department of Diagnostic Sciences and General Dentistry, University of North Carolina at Chapel Hill, USA.
出版信息
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2001 Jan;91(1):109-19. doi: 10.1067/moe.2001.110574.
UNLABELLED
Objective. This study compares the physical characteristics of the RVG UI sensor (RVG) with Ektaspeed Plus film.
STUDY DESIGN
Dose-response curves were generated for film and for each of 6 available RVG modes. An aluminum step-wedge was used to evaluate exposure latitude. Spatial resolution was assessed by using a line-pair test tool. Latitude and resolution were assessed by observers for both modalities. The RVG was further characterized by its modulation transfer function.
RESULTS
Exposure latitude was equal for film and RVG in the periodontal mode. Other gray scale modes demonstrated much lower latitude. The average maximum resolution was 15.3 line-pairs per millimeter (lp/mm) for RVG in high-resolution mode, 10.5 lp/mm for RVG in low-resolution mode, and 20 lp/mm for film (P <.0001). Modulation transfer function measurements supported the subjective assessments.
CONCLUSIONS
In periodontal mode, the RVG UI sensor demonstrates exposure latitude similar to that of Ektaspeed Plus film. Film images exhibit significantly higher spatial resolution than the RVG images acquired in high-resolution mode.
未标注
目的。本研究比较了RVG UI传感器（RVG）与Ektaspeed Plus胶片的物理特性。
研究设计
为胶片和6种可用的RVG模式分别生成剂量反应曲线。使用铝阶梯楔形板评估曝光宽容度。使用线对测试工具评估空间分辨率。由观察者对两种模式的宽容度和分辨率进行评估。通过调制传递函数对RVG进行进一步表征。
结果
在牙周模式下，胶片和RVG的曝光宽容度相等。其他灰度模式的宽容度则低得多。RVG在高分辨率模式下的平均最大分辨率为每毫米15.3线对（lp/mm），低分辨率模式下为10.5 lp/mm，胶片为20 lp/mm（P <.0001）。调制传递函数测量结果支持主观评估。
结论
在牙周模式下，RVG UI传感器的曝光宽容度与Ektaspeed Plus胶片相似。胶片图像的空间分辨率明显高于在高分辨率模式下获取的RVG图像。
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