Quantitative radiographic imaging using a photostimulable phosphor system.
Quantitative radiographic imaging using a photostimulable phosphor system.
复制标题
使用光刺激磷光体系统进行定量放射线成像。
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
C. Ravin
中科院分区：
文献类型：
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作者：
C. Floyd;H. Chotas;J. Dobbins;C. Ravin
我们已经评估了一种可光刺激的磷光X射线成像系统[飞利浦计算机射线照相(PCR)系统]，用于诊断射线照相中的X射线曝光的量化。指数函数被拟合到产生作为数字像素值的函数的定量X射线曝光值的数据中。我们研究了几个影响使用PCR进行曝光测量的准确性的因素，包括重复性、作为板擦除和使用之间的时间延迟的函数的背景噪声、不同板之间的灵敏度差异、板内灵敏度的不均匀、曝光时间和读出之间潜像的衰减(观察到灵敏度的变化)，以及(指数)校准函数作为数字像素值的函数产生曝光值的精度。校准范围为5.1×10(-9)~2.0×10(-5)C/kg(0.02-75MR)。用单个成像板进行曝光测量的精度在1.6%到4.2%之间。如果涉及多个板的测量，最终测量的不确定度将在5%至5.9%之间。
We have evaluated a photostimulable phosphor x-ray imaging system [Philips Computed Radiography (PCR) system] for use in quantification of x-ray exposure in diagnostic radiography. An exponential function was fitted to data yielding quantitative x-ray exposure values as a function of digital pixel values. We investigated several factors that affect the accuracy of exposure measurement using the PCR including repeatability, background noise as a function of time delay between plate erasure and use, sensitivity variation between different plates, nonuniformity of sensitivity within a plate, decay of the latent image between time of exposure and readout (observed as a change in sensitivity), and the accuracy with which the (exponential) calibration function yields exposure values as a function of digital pixel values. The calibration was performed over the exposure range from 5.1 X 10(-9) to 2.0 X 10(-5) C/kg (0.02-75 mR). The accuracy of exposure measurements made with a single imaging plate is between 1.6% and 4.2%. If measurements from several plates are involved, the uncertainty in the final measurement will be between 5% and 5.9%.