Boone J M, Tecotzky M, Alexander G M
Department of Radiology, Thomas Jefferson University, Philadelphia, PA 19107.
Radiology. 1992 Jun;183(3):863-70. doi: 10.1148/radiology.183.3.1584948.
Dual-energy radiographic acquisition performed with a single pulse of x rays has been limited to use of stacked detectors such as photo-stimulable phosphor plates. In this study, a binary screen system is introduced that enables single-pulse dual-energy acquisition with nonstacked detectors such as charge-coupled devices (CCDs). Two x-ray phosphors with different K edges, designed to emit light of different wavelengths, were bound together in a single screen. Two CCD cameras, each sensitive to the respective wavelengths emitted by each phosphor, are proposed to be coupled to the binary screen. Optical isolation and detection of the optical emissions from the screen would enable simultaneous acquisition of both low- and high-energy images, which can then be used in dual-energy subtraction. Computer simulation results and experimentally acquired images suggest that the binary screen approach may be a viable alternative to stacked detector technology for dual-energy radiographic imaging.
利用单个X射线脉冲进行的双能射线摄影采集一直局限于使用诸如光激励荧光板之类的堆叠探测器。在本研究中，引入了一种二元屏系统，该系统能够使用电荷耦合器件（CCD）等非堆叠探测器进行单脉冲双能采集。两种具有不同K边的X射线荧光体，设计用于发射不同波长的光，被结合在一个单一的屏中。提出将两个分别对每个荧光体发射的各自波长敏感的CCD相机耦合到二元屏上。对屏发出的光进行光学隔离和检测将能够同时采集低能和高能图像，然后可用于双能减影。计算机模拟结果和实验获取的图像表明，二元屏方法可能是用于双能射线摄影成像的堆叠探测器技术的一种可行替代方案。
