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DQE Characterization of a High-energy In-line Phase Contrast Prototype under Different kVp and Beam Filtration

机译：DQE在不同KVP和光束过滤下的高能量在线相位对比原型的表征

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摘要

The objective of this research is to characterize the detective quantum efficiency (DQE) of a high-energy in-line phase contrast prototype operated under different x-ray exposure conditions. First of all, an imaging prototype was demonstrated based on a high-energy in-line phase contrast system prototype. The DQE of this system is calculated through modulation transfer function (MTF), noise power spectrum (NPS) and input signal to noise ratio under a fixed radiation dose. The radiation dose was estimated by employing a 4-cm-thick BR12 phantom. In this research, the x-ray exposure conditions were modified by not only using different tube voltage but also different prime beam filtration. Aluminum, Molybdenum, Rhodium, and a combined filter were selected to acquire a variety of x-ray energy compositions with 100, 110 and 120 kVp exposures. The resultant curves are compared through the modes of different kVp/same filter and different filter/same kVp. As a result, the curves obtained under a fixed radiation dose, indicate that the MTF performs similar behavior under different experimental mode; the NPS is majorly affected by the composition of x-ray photon energies; and the overall DQE decreases with the increasing portion of high-energy x-ray photons in the exposure.
机译：该研究的目的是在不同X射线暴露条件下表征高能在线相位对比原型的侦探量子效率（DQE）。首先，基于高能量在线相位对比系统原型来证明成像原型。该系统的DQE通过调制传递函数（MTF），噪声功率谱（NPS）和在固定辐射剂量下的输入信号和噪声比计算。通过使用4cm厚的BR12幻影估计辐射剂量。在该研究中，不仅使用不同的管电压而且不同的主要束过滤来修改X射线暴露条件。选择铝，钼，铑和组合过滤器以获得100,110和120 kVP曝光的各种X射线能量组合物。通过不同KVP /相同滤波器和不同滤波器/相同KVP的模式进行比较所得曲线。结果，在固定辐射剂量下获得的曲线，表明MTF在不同的实验模式下进行类似的行为; NPS主要受X射线光子能量的组成影响;并且整体DQE随着曝光中的高能X射线光子的增加而降低。

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