[Comparison of noise characteristics of direct and indirect conversion flat panel detectors].
[Comparison of noise characteristics of direct and indirect conversion flat panel detectors].
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直接与间接转换平板探测器噪声特性比较。
DOI：
10.6009/jjrt.66.1443
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
A. Ienaga
中科院分区：
文献类型：
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作者：
Masami Murai;K. Kishimoto;Katsuhisa Tanaka;Kenji Oota;A. Ienaga
平板探测器（FPD）数字X射线摄影系统有直接和间接转换系统，两种转换系统提供不同的成像性能。我们测量了直接和间接FPD系统的一些成像性能[输入输出特性，预采样调制传递函数（预采样MTF），噪声功率谱（SNR）]。此外，通过配对比较法对NPS的一些图像样本进行了视觉评价。结果，直接FPD系统的预采样MTF显著高于间接FPD系统。直接FPD系统的反射率对于所有空间频率都具有高值。相反，间接FPD系统的反射率随着频率变高而具有较低值。视觉评价的结果显示出与NPS相同的趋势。我们在模拟研究中阐明了NPS差异的原因，并确定直接和间接FPD系统噪声分量差异的原因与预采样的MTF密切相关。
Flat-panel detector (FPD) digital radiography systems have direct and indirect conversion systems, and the 2 conversion systems provide different imaging performances. We measured some imaging performances [input-output characteristic, presampled modulation transfer function (presampled MTF), noise power spectrum (NPS)] of direct and indirect FPD systems. Moreover, some image samples of the NPSs were visually evaluated by the pair comparison method. As a result, the presampled MTF of the direct FPD system was substantially higher than that of the indirect FPD system. The NPS of the direct FPD system had a high value for all spatial frequencies. In contrast, the NPS of the indirect FPD system had a lower value as the frequency became higher. The results of visual evaluations showed the same tendency as that found for NPSs. We elucidated the cause of the difference in NPSs in a simulation study, and we determined that the cause of the difference in the noise components of the direct and indirect FPD systems was closely related to the presampled MTF.