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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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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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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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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

4.0K
X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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相关实验视频

Updated: Sep 13, 2025

In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography CT and Light Microscopy LM Correlated with Scanning Electron Microscopy SEM
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In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography CT and Light Microscopy LM Correlated with Scanning Electron Microscopy SEM

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在压缩性X射线康普顿反射成像中优化照明模式.

Abdullah K Alrushud, Edgar Salazar, Gonzalo Arce

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    此摘要是机器生成的。

    这项研究为压缩性X射线康普顿反射成像 (CXBI) 引入了新的编码模式,以改善安全扫描. 基于模型和数据的方法设计了最佳模式,优于随机模式,以获得更好的图像质量和更低的辐射剂量.

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    Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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    In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography CT and Light Microscopy LM Correlated with Scanning Electron Microscopy SEM
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    Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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    科学领域:

    • 医学成像医学成像
    • 计算机成像成像技术
    • 在X射线物理中,X射线物理学

    背景情况:

    • 压缩性X射线康普顿反射成像 (CXBI) 是安全检查的一种新技术,可以减少辐射剂量.
    • 它使用编码的照明模式和单像素成像原理.
    • 对CXBI的最佳编码模式以前没有被探索过.

    研究的目的:

    • 为了分析CXBI的传感矩阵.
    • 开发基于模型和数据的解决方案,以获得最佳的编码模式.
    • 为了最大限度地提高CXBI.BI中重建图像的质量.

    主要方法:

    • 分析CXBI传感矩阵,使用传导率和相互连贯性等特征.
    • 基于模型的方法使用梯度下降,ADMM和BM3D无声化.
    • 以数据为导向的方法,使用剩余的U块进行训练和重建,使用Geant-4模拟噪声.
    • 测试模式使用Geant-4 Tomographic Emissions (GATE) 应用程序进行测试.

    主要成果:

    • 基于模型和数据驱动的设计代码都明显优于随机代码.
    • 数据驱动的方法产生了优越的图像质量指标.
    • 在现实的模拟条件下确定并验证了最佳模式.

    结论:

    • 设计的编码模式可以提高CXBI的性能.
    • 数据驱动的解决方案提供最高质量的重建.
    • 这项研究为使用CXBI.改进的安全检查技术铺平了道路.