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Measurements of the Modulation Transfer Function, Normalized Noise Power Spectrum and Detective Quantum Efficiency for two flat panel detectors: A Fluoroscopic and a Cone Beam Computer Tomography Flat Panel Detectors

机译:测量两个平板探测器的调制传递函数,归一化噪声功率谱和探测量子效率:荧光镜和锥束计算机断层扫描平板探测器

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摘要

The physical performance of two Flat Panel Detectors has been evaluated. The first Flat Panel Detector is for Fluoroscopic applications, Varian PaxScan 2520, and the second is for Cone Beam Computer Tomography applications, Varian PaxScan 4030CB. First, the spectrum of the X-ray source was measured. Second, the linearity of the detectors was investigated by using an ionization chamber and the average ADU values of the detectors. Third, the temporal resolution was characterized by evaluating their image lag. Fourth, their spatial resolution was characterized by the pre-sampling Modulation Transfer Function. Fifth, the Normalized Noise Power Spectrum was calculated for various exposures levels. Finally, the Detective Quantum Efficiency was obtained as a function of spatial frequency and entrance exposure. The results illustrate that the physical performance in Detective Quantum Efficiency and Normalized Noise Power Spectrum of the Cone Beam Computer Tomography detector is superior to that of the fluoroscopic detector whereas the latter detector has a higher spatial resolution as demonstrated by larger values of its Modulation Transfer Function at large spatial frequencies.
机译:已评估了两个平板探测器的物理性能。第一个平板探测器用于荧光检查应用Varian PaxScan 2520,第二个用于锥束计算机断层摄影应用Varian PaxScan 4030CB。首先,测量X射线源的光谱。其次,通过使用电离室和探测器的平均ADU值研究探测器的线性。第三,时间分辨率通过评估其图像滞后来表征。第四,其空间分辨率的特征在于预采样调制传递函数。第五,针对各种暴露水平计算归一化噪声功率谱。最后,获得了量子探测效率与空间频率和入射辐射的关系。结果表明,锥形束计算机层析成像探测器的探测量子效率和归一化噪声功率谱的物理性能优于荧光镜探测器,而后者的探测器具有更高的空间分辨率,这可通过较大的调制传递函数值来证明。在大空间频率下

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