Chen S K, Hollender L
Department of Oral Medicine, School of Dentistry, University of Washington, Seattle.
Oral Surg Oral Med Oral Pathol. 1992 Oct;74(4):524-30. doi: 10.1016/0030-4220(92)90306-b.
Image resolution was measured in the midsagittal plane of the Orthopantomograph-10 with the use of Lanex regular and T-Mat G screen-film combination. A thin platinum edge phantom was used to obtain images for calculation of the edge response functions. Subsequently, line spread functions and modulation transfer functions of the system were calculated. Noise equivalent passband values, which were expressed in line pairs per millimeter, were derived to describe the image resolution. The noise equivalent passband values derived in this study were generally smaller than those reported in a previous study. The width of the image layer was found to be uniform at different vertical levels.
使用Lanex常规型和T-Mat G增感屏-胶片组合，在Orthopantomograph-10的正中矢状面测量图像分辨率。使用薄铂边缘体模获取图像以计算边缘响应函数。随后，计算系统的线扩展函数和调制传递函数。导出以每毫米线对数表示的噪声等效通带值，以描述图像分辨率。本研究得出的噪声等效通带值通常小于先前研究报告的值。发现图像层的宽度在不同垂直层面是均匀的。
