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

机译：不同kVp和电子束过滤条件下高能在线相衬原型的DQE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：这项研究的目的是表征在不同的X射线曝光条件下运行的高能在线相衬原型的检测量子效率（DQE）。首先，演示了基于高能在线相衬系统原型的成像原型。该系统的DQE通过调制传递函数（MTF），噪声功率谱（NPS）和固定辐射剂量下的输入信噪比来计算。辐射剂量是通过使用4厘米厚的BR12体模估算的。在这项研究中，不仅通过使用不同的管电压，而且通过使用不同的主光束过滤条件来修改X射线曝光条件。选择铝，钼，铑和组合滤光片以获取100、110和120 kVp暴露的各种X射线能量组成。通过不同kVp /相同滤波器和不同滤波器/相同kVp的模式比较所得曲线。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表现出相似的行为。 NPS主要受X射线光子能量组成的影响；随着曝光中高能X射线光子的增加，总DQE降低。

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  • 来源
    《Biophotonics and immune responses X》|2015年|932418.1-932418.10|共10页
  • 会议地点 San Francisco CA(US)
  • 作者

    Di Wu; Molly D. Wong; Yuhua Li; Wei R. Chen; Xizeng Wu; Hong Liu;

  • 作者单位

    Center for Bioengineering and School of Electrical and Computer Engineering, University of Oklahoma;

    Center for Bioengineering and School of Electrical and Computer Engineering, University of Oklahoma;

    Center for Bioengineering and School of Electrical and Computer Engineering, University of Oklahoma;

    Department of Engineering and Physics, University of Central Oklahoma;

    Department of Radiology, University of Alabama at Birmingham;

    Center for Bioengineering and School of Electrical and Computer Engineering, University of Oklahoma;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High-energy In-line Phase Contrast; DQE; Radiation dose; Spectrum; Low-energy Removal;

    机译：高能在线相衬； DQE；辐射剂量；光谱;低能耗;

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