Welander U, McDavid W D, Sanderink G C, Tronje G, Mörner A C, Dove S B
Department of Oral Radiology, Karolinska Institute, Stockholm, Sweden.
Oral Surg Oral Med Oral Pathol. 1994 Jul;78(1):109-15. doi: 10.1016/0030-4220(94)90126-0.
Line spread functions for four commercially available systems for direct digital intraoral radiography were determined from images of a slit of negligible width. From the fitted line spread functions presampling modulation transfer functions were calculated. The four systems were the Sens-A-Ray (Regam Medical System AB, Sundsvall, Sweden), the VIXA/Visualix (Gendex, Chicago Ill.), the RVG (Trophy Radiologic, Paris, France), and the Flash Dent (Villa Sistemi Medicale srd, Buccinasco, Italy). Digital intraoral radiography is in a state of rapid development, and detectors as well as computer hardware and software are continually modified and improved resulting in successively changing system parameters. As this occurs the present work provides a method that may be used to determine comparable data on future systems.
通过宽度可忽略不计的狭缝图像，确定了四种市售直接数字化口腔内放射成像系统的线扩展函数。根据拟合的线扩展函数计算了预采样调制传递函数。这四种系统分别是Sens - A - Ray（瑞典松兹瓦尔Regam医疗系统公司）、VIXA/Visualix（美国伊利诺伊州芝加哥Gendex公司）、RVG（法国巴黎Trophy Radiologic公司）和Flash Dent（意大利布西纳斯科Villa Sistemi Medicale srd公司）。数字化口腔内放射成像正处于快速发展阶段，探测器以及计算机硬件和软件不断改进，导致系统参数不断变化。在此过程中，本研究提供了一种可用于确定未来系统可比数据的方法。
