此项研究采用以硒为基础的数字X线摄影系统。硒的成像系统的基本原理包括:影像接受器是由一个薄层光电导体组成,其中无定形硒蒸发涂布于典型为铝的传导基质上。每次X线曝光前,先使硒的表面存贮阳离子而产生均一阳电荷,导致在无定形硒层产生电子场。在X线曝光期间,在硒内产生电子穴偶且自由电子游离到表面。此导致在硒的表面产生潜在电荷影像,在每一点上电荷密度与局 The study used a selenium-based digital radiography system. Fundamentals of selenium imaging systems include: The image receptor is composed of a thin layer of photoconductor in which amorphous selenium is evaporated over a conductive substrate, typically aluminum. Prior to each X-ray exposure, the surface of the selenium is first stored with cations to produce a uniform positive charge, resulting in an electron field in the amorphous selenium layer. During X-ray exposure, electron-hole pairs are generated within the selenium and free electrons are released to the surface. This results in a latent charge image on the surface of the selenium with a charge density at each point