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    【6h】 Development of an X-ray prism for a combined diffraction enhanced imaging and fluorescence imaging system.

    机译用于组合衍射增强成像和荧光成像系统的X射线棱镜的开发。

    【摘要】Analyzer crystal based imaging techniques such as diffraction enhanced imaging (DEI) and multiple imaging radiography (MIR) utilize the Bragg peak of perfect crystal diffraction to convert angular changes into intensity changes. These X-ray techniques extend the capability of conventional radiography, which derives image contrast from absorption, by providing a large change in intensity for a small angle change introduced by the X-ray beam traversing the sample. Objects that have very little absorption contrast may have considerable refraction and ultra small angle X-ray scattering (USAXS) contrast thus improving visualization and extending the utility of X-ray imaging. To improve on the current DEI technique this body of work describes the design of an X-ray prism (XRP) included in the imaging system which allows the analyzer crystal to be aligned anywhere on the rocking curve without moving the analyzer from the Bragg angle. By using the XRP to set the rocking curve alignment rather than moving the analyzer crystal physically the needed angle sensitivity is changed from muradians for direct mechanical movement of the analyzer crystal to milliradian control for movement the XRP angle. In addition to using an XRP for the traditional DEI acquisition method of two scans on opposite sides of the rocking curve preliminary tests will be presented showing the potential of using an XRP to scan quickly through the entire rocking curve. This has the benefit of collecting all the required data for image reconstruction in a single fast measurement thus removing the occurrence of motion artifacts for each point or line used during a scan. The XRP design is also intended to be compatible with combined imaging systems where more than one technique is used to investigate a sample. Candidates for complimentary techniques are investigated and measurements from a combined X-ray imaging system are presented.

    【摘要机译】基于分析器晶体的成像技术,例如衍射增强成像(DEI)和多重成像射线照相(MIR),利用完美晶体衍射的布拉格峰将角度变化转换为强度变化。这些X射线技术通过为X射线束穿过样品引入的较小角度变化提供强度的较大变化,从而扩展了常规射线照相的功能,该功能可通过吸收获得图像对比度。吸收对比度非常低的物体可能具有相当大的折射力和超小角度X射线散射(USAXS)对比度,从而改善了可视性并扩展了X射线成像的实用性。为了改进当前的DEI技术,本文描述了成像系统中包含的X射线棱镜(XRP)的设计,该设计可使分析仪晶体在摇摆曲线上的任何位置对齐,而无需将分析仪从布拉格角移开。通过使用XRP设置摇摆曲线的对齐方式而不是物理移动分析器晶体,所需的角度灵敏度从用于分析器晶体直接机械运动的马来弧度改变为用于移动XRP角度的弧度控制。除了在传统的DEI采集方法中使用XRP,在摇摆曲线的相对两侧进行两次扫描之外,还将进行初步测试,以显示使用XRP快速扫描整个摇摆曲线的潜力。这样做的好处是,可以在一次快速测量中收集图像重建所需的所有数据,从而消除了扫描期间使用的每个点或线出现运动伪影的情况。 XRP设计还旨在与组合成像系统兼容,在组合成像系统中,使用了多种技术来研究样品。研究了互补技术的候选人,并提出了组合X射线成像系统的测量结果。

    【原文格式】PDF

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