用于数字乳房x线照相术的稀土图像受体中的信号传播

Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society Pub Date : 1996-10-31 DOI:10.1109/IEMBS.1996.652001

I. Kandarakis, D. Cavouras, G. Panayiotakis, E. Papadopoulou, C. Nomicos

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引用次数: 0

摘要

利用实验室制备的Gd/sub 2/O/sub 2/S:Tb和La/sub 2/O/sub 2/S:Tb荧光屏，研究了信号在图像受体中的转换和传播。在实验和理论上对每单位x射线照射下屏幕发出的光信号在乳房x光造影能量范围内进行了评估。研究了与信号传播相关的参数(光吸收、散射、反射和光脉冲统计分布)、固有x射线到光的转换效率以及光电探测器产生的电子信号。采用Gd/sub 2/O/sub 2/S:Tb屏幕的图像受体产生更高的光学和电子信号强度，而采用La/sub 2/O/sub 2/S:Tb屏幕的受体提供更好的光脉冲统计，从而降低噪声。

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Signal propagation in rare earth image receptors for digital mammography applications

Signal conversion and propagation in image receptors were studied employing laboratory prepared Gd/sub 2/O/sub 2/S:Tb and La/sub 2/O/sub 2/S:Tb phosphor screens. The optical signal emitted by the screens per unit of X-ray exposure was experimentally and theoretically evaluated in the mammographic energy range. Parameters related to signal propagation (light absorption, scattering, reflection, and optical pulses statistical distribution), intrinsic X-ray to light conversion efficiency, and electron signal generated by the photodetector were studied. Image receptors employing Gd/sub 2/O/sub 2/S:Tb screens produce higher optical and electron signal intensities whereas receptors with La/sub 2/O/sub 2/S:Tb screens give better optical pulse statistics, resulting in noise reduction.

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Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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