Improved imaging performance of a 14"x17" direct radiography system using a Se/TFT detector
Improved imaging performance of a 14"x17" direct radiography system using a Se/TFT detector
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使用 Se/TFT 探测器改进 14"x17" 直接射线照相系统的成像性能
DOI：
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
G. F. Powell
中科院分区：
文献类型：
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作者：
Denny L. Y. Lee;L. K. Cheung;B. Rodricks;G. F. Powell
讨论了为一般射线照相应用而设计的直接射线照相TM固态、平板、数字探测器的改进进展。这种探测器现在被称为DirectRayTM，它的工作原理是用硒光导体直接探测X射线光子，由500微米厚的非晶硒耦合到非晶硅薄膜晶体管(TFT)读出阵列组成。该器件具有14×17英寸(35×43厘米)的主动成像区域，相当于2560×3072像素，尺寸为139微米×139微米，几何填充系数为86%。改进包括TFT阵列设计升级，具有更低的噪声特性、更低的噪声读出电子设备和改进的接口。目前，利用DirectRay探测器使用相当于400速屏幕-胶片组合的X射线曝光水平来生成临床放射图像，同时保持直接转换方法所固有的卓越空间分辨率。一种有效的传感器修复技术已经实施，消除了高剂量后可能出现的硒记忆伪迹。给出了NPS、MTF、DQE和信号线性度方面的新结果。讨论了使用FAxiL测试对象对低对比度对象的可检测性以及临床研究的结果。
Progress is discussed on the improvement of a Direct RadiographyTM solid state, flat panel, digital detector designed for use in general radiographic applications. This detector, now known as DirectRayTM, operates on the principle of direct detection of X-ray photons with a selenium photoconductor and consists of 500 micrometer thick amorphous selenium coupled to an amorphous silicon thin-film-transistor (TFT) readout array. This device is fabricated with a 14 X 17-inch (35 X 43-cm) active imaging area, corresponding to 2560 X 3072 pixels having dimensions of 139 micrometer X 139 micrometer and a geometrical fill factor of 86%. Improvements include a TFT array design upgrade with reduced noise characteristic, lower-noise readout electronics, and improved interfaces. Clinical radiographic images are currently being generated with the DirectRay detector using an X-ray exposure level equivalent to that of a 400 speed screen- film combination while maintaining the superior spatial resolution that is inherent in the direct conversion method. An effective sensor restoration technique has been implemented that eliminates the potential for selenium memory artifacts after a high dose. New results on NPS, MTF, DQE and signal linearity are presented. Detectability of low contrast objects using FAXiL test objects as well as the results of clinical studies are discussed.
数字放射线摄影中基本成像特性的研究。
影响因子：
3.8
作者：
Giger,ML;Doi,K;Metz,CE
通讯作者：
Metz,CE
影响因子：
3.8
作者：
DOBBINS, JT
通讯作者：
DOBBINS, JT
影响因子：
3.8
作者：
Siewerdsen, JH;Antonuk, LE;Cunningham, IA
通讯作者：
Cunningham, IA