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首页> 外文期刊>Journal of Digital Imaging >An Experimental Comparison of Flat-Panel Detector Performance for Direct and Indirect Systems (Initial Experiences and Physical Evaluation)
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An Experimental Comparison of Flat-Panel Detector Performance for Direct and Indirect Systems (Initial Experiences and Physical Evaluation)

机译：直接和间接系统的平板检测器性能的实验比较（初步经验和物理评估）

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摘要

The purpose of this work was to compare direct and indirect detectors in terms of their system linearity, presampled modulation transfer function (MTF), Wiener spectrum (WS), noise equivalent quanta (NEQ), and power spectrum. Measurements were made on two flat-panel detectors, GE Revolution XR/d (indirect) and Shimadzu Safire (direct) radiographic techniques. The system linearity of the systems was measured using a time-scale method. The MTF of the systems was measured using an edge method. The WS of the systems was determined for a variable range of exposure levels by two-dimensional Fourier analysis. The NEQ was assessed from the measured MTF, WS, and estimated ideal signal-to-noise ratios. Power spectrum analyzed the chest phantom within artificial lesions. System linearity was excellent for the direct systems. For the direct system, the MTF was found to be significantly higher than that for the indirect systems. For the direct system, the WS was relatively uniform across all frequencies. In comparison, the indirect system exhibited a drop in the WS at high frequencies. At lower frequencies, the NEQ for the indirect system was noticeably higher than for the direct system. Power spectrum for the direct system was relatively flat and similar to that for white noise. The indirect system exhibited significant reduction at high spatial frequencies. In general, the direct systems exhibit improved image quality over indirect systems at comparable exposure dose.
机译：这项工作的目的是根据系统线性度，预采样调制传递函数（MTF），维纳谱（WS），噪声等效量（NEQ）和功率谱对直接和间接检测器进行比较。在两个平板探测器上进行了测量，GE Revolution XR / d（间接）和Shimadzu Safire（直接）射线照相技术。使用时标方法测量系统的系统线性。使用边缘法测量系统的MTF。通过二维傅里叶分析确定了系统的WS，确定了不同水平的暴露水平。根据测得的MTF，WS和估计的理想信噪比评估NEQ。功率谱分析了人工病变内的胸部幻影。对于直接系统，系统线性非常好。对于直接系统，发现MTF明显高于间接系统。对于直接系统，WS在所有频率上都是相对统一的。相比之下，间接系统在高频下的WS下降。在较低的频率下，间接系统的NEQ明显高于直接系统。直接系统的功率谱相对平坦，类似于白噪声。间接系统在高空间频率下表现出明显的降低。通常，在可比较的曝光剂量下，直接系统显示出比间接系统更高的图像质量。

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