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Anisotropic optical distribution of powder phosphor materials applied in medical imaging instrumentation

机译：粉末荧光粉材料在医学成像仪器中的各向异性光学分布

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摘要

Image quality for medical purposes is related to the useful diagnostic information that can be extracted from an image. The performance of indirect X-ray detectors, which in turn affects the quality of the medical image, can be significantly influenced by the characteristics of the phosphor, employed to convert incident radiation into emitted light. Given the technological and medical importance of phosphor materials, understanding the fundamental effects of optical anisotropy is crucial. The purpose of the present paper was to examine the influence of optical anisotropy in optical diffusion within the powder phosphor-based X-ray detectors. The present investigation was based on Mie scattering theory and Monte Carlo simulation techniques. The variation of the anisotropy factor was examined for: (1) light wavelengths in the range 400-700 nm, (2) particle refractive index between 1.5 and 2 and (3) three regions of particle sizes: nanoscale (from 10 up to 100 nm), submicron scale (from 100 nm up to 1 μm), and microscale (from 1 up to 10 μm). In addition, optical diffusion performance was carried out considering: (a) anisotropy factor values 0.2, 0.5, 0.8 which represent different aspects of light propagation after scattering and (b) phosphors of different layer thickness, 100 (thin layer) and 300 μm (thick layer), respectively. Results showed that the highest variation on the anisotropy factor was observed in the submicron scale, and, in particular, for grain diameters between 100 and 600 nm (increase from 0.1 up to 0.8). In addition, Monte Carlo simulations showed that the spread of light photons decreases (i.e., high spatial resolution) with the decrease in the anisotropy factor. In particular, the FWHM was found to decrease with the anisotropy factor: (1) 11.4 % at 100 μm and 4.2 %, at 300 μm layer thickness, for light extinction coefficient 0.217 μm~(-1) and (2) 1.9 % at 100 μm and 2.0 %, at 300 μm layer thickness, for light extinction coefficient 3 μm~(-1). The present work indicated that lateral spreading is affected by the anisotropy factor. However, this effect is more dominant for low values of light extinction coefficient of the material.
机译：用于医学目的的图像质量与可以从图像中提取的有用诊断信息有关。间接X射线检测器的性能继而影响医学图像的质量，可能会受到磷光体特性的显着影响，磷光体用于将入射辐射转换为发射光。考虑到磷光体材料的技术和医学重要性，了解光学各向异性的基本作用至关重要。本文的目的是研究光学各向异性对基于粉末磷光体的X射线探测器内部光扩散的影响。本研究基于米氏散射理论和蒙特卡罗模拟技术。在以下方面检查了各向异性因子的变化：（1）在400-700 nm范围内的光波长;（2）介于1.5和2之间的粒子折射率;（3）粒径的三个区域：纳米级（从10到100纳米），亚微米级（从100 nm到1μm）和微米级（从1到10μm）。此外，考虑以下因素来执行光扩散性能：（a）各向异性因子值0.2、0.5、0.8代表散射后光传播的不同方面;（b）不同厚度，100（薄层）和300μm的磷光体（厚层）。结果表明，在亚微米尺度上观察到各向异性系数的最大变化，特别是对于100到600 nm之间的晶粒直径（从0.1增大到0.8）。另外，蒙特卡洛模拟表明，光子的扩散随着各向异性因子的减小而减小（即，高空间分辨率）。特别地，发现FWHM随着各向异性因子而降低：（1）对于10017 m的层，消光系数为0.217μm〜（-1），在100μm处为11.4％，在300μm层厚度下为4.2％，在（2）处的消光系数为1.9％。 100微米和2.0％，在300微米的层厚度下，消光系数3微米〜（-1）。目前的工作表明，横向扩展受各向异性因素的影响。然而，对于材料的低消光系数值，这种效果更为明显。

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  • 来源
    《Applied Physics》 |2016年第2期|93.1-93.9|共9页
  • 作者

    P. F. Liaparinos;

  • 作者单位

    Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, Technological Educational Institute (TEI) of Athens, 12210 Athens, Greece;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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