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Coded-Aperture Compton Camera for Gamma-Ray Imaging

机译:用于伽马射线成像的编码孔径康普顿相机

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摘要

This dissertation describes the development of a novel gamma-ray imaging system concept and presents results from Monte Carlo simulations of the new design. Current designs for large field-of-view gamma cameras suitable for homeland security applications implement either a coded aperture or a Compton scattering geometry to image a gamma-ray source. Both of these systems require large, expensive position-sensitive detectors in order to work effectively. By combining characteristics of both of these systems, a new design can be implemented that does not require such expensive detectors and that can be scaled down to a portable size. This new system has significant promise in homeland security, astronomy, botany and other fields, while future iterations may prove useful in medical imaging, other biological sciences and other areas, such as non-destructive testing. A proof-of-principle study of the new gamma-ray imaging system has been performed by Monte Carlo simulation. Various reconstruction methods have been explored and compared. General-Purpose Graphics-Processor-Unit (GPGPU) computation has also been incorporated. The resulting code is a primary design tool for exploring variables such as detector spacing, material selection and thickness and pixel geometry. The advancement of the system from a simple 1-dimensional simulation to a full 3-dimensional model is described. Methods of image reconstruction are discussed and results of simulations consisting of both a 4 x 4 and a 16 x 16 object space mesh have been presented. A discussion of the limitations and potential areas of further study is also presented.
机译:本文描述了新型伽马射线成像系统概念的发展,并提出了新设计的蒙特卡洛模拟的结果。适用于国土安全应用的大型视野伽马相机的当前设计实现了编码孔径或康普顿散射几何形状以对伽马射线源成像。这两个系统都需要大型,昂贵的位置敏感检测器,才能有效工作。通过结合这两个系统的特性,可以实现不需要这种昂贵的检测器并且可以缩小到便携式尺寸的新设计。这个新系统在国土安全,天文学,植物学和其他领域具有巨大的希望,而未来的迭代可能在医学成像,其他生物科学和其他领域(如无损检测)中被证明是有用的。通过蒙特卡洛模拟对新的伽马射线成像系统进行了原理验证研究。已经探索并比较了各种重建方法。通用图形处理器单元(GPGPU)计算也已合并。生成的代码是用于探索变量的主要设计工具,例如探测器间距,材料选择,厚度和像素几何形状。描述了系统从简单的一维模拟到完整的三维模型的发展。讨论了图像重建方法,并提出了由4 x 4和16 x 16的对象空间网格组成的仿真结果。还讨论了局限性和进一步研究的潜在领域。

著录项

  • 作者

    Farber Aaron M.;

  • 作者单位
  • 年度 2013
  • 总页数
  • 原文格式 PDF
  • 正文语种 en_US
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