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相关概念视频

X-ray Imaging01:24

X-ray Imaging

7.4K
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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相关实验视频

Updated: Sep 13, 2025

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

Published on: September 11, 2011

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通过编码的光圈成像来解码冷阴极平面面板X射线源分布.

Wangjiang Wu, Guocong Shao, Qing Li

    Optics express
    |July 30, 2025
    PubMed
    概括
    此摘要是机器生成的。

    我们开发了一种新的方法来绘制平面X射线源 (FPXS) 的X射线源分布图. 这种技术使用编码的面具投影和最大概率算法来重建源,从而实现对非统一性的关键补偿.

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    Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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    相关实验视频

    Last Updated: Sep 13, 2025

    X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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    X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

    Published on: September 11, 2011

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    Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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    科学领域:

    • 医疗成像医学成像
    • 物理 物理学 物理
    • 材料科学 材料科学 材料科学

    背景情况:

    • 传统的X射线管与冷阴极平板X射线源 (FPXS) 不同,这些X射线源集成了众多点源.
    • 从FPXS发出的X射线辐射的空间分布目前尚不清楚,很难直接测量.
    • 这种缺乏知识阻碍了FPXS技术的实际应用和优化.

    研究的目的:

    • 开发一种方法来准确确定FPXS的X射线源分布.
    • 为了使FPXS的非统一性得到补偿,以提高性能.
    • 促进FPXS技术的新型应用.

    主要方法:

    • 从编码面具的别名投影的X射线分布的分解.
    • 使用圆形卷积来编码在投影数据中的FPXS流量.
    • 使用最大概率预期-最大化 (ML-EM) 算法重建源分布.
    • 通过蒙特卡洛 (MC) 模拟和现实世界的实验验证.

    主要成果:

    • 成功重建了FPXS的X射线发射形状,使用阳极基板上的板.
    • 在实验中证明了编码面具投影和ML-EM算法的有效性.
    • 证实,拟议的方法可以准确地绘制未知的X射线源分布.

    结论:

    • 拟议的方法有效地重建了FPXS的X射线源分布.
    • 对于未来的应用来说,了解和补偿FPXS不统一性是必不可少的.
    • 这种技术对于推进平板X射线源的实际使用至关重要.