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相关概念视频

Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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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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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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Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers
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太赫兹计算断层扫描的非线性前向和重建框架.

Zhenguang Chen, Zhiguo Wang, Bohui Chen

    Optics express
    |February 20, 2026
    PubMed
    概括

    这项研究引入了太赫兹计算断层扫描 (THz-CT) 的新非线性框架,以提高重建的准确性. 通过考虑波折射,该方法可以在非破坏性测试中增强内部结构的成像.

    科学领域:

    • 物理 物理学 物理
    • 影像科学 影像科学
    • 材料科学 材料科学 材料科学

    背景情况:

    • 特拉赫兹计算断层扫描 (THz-CT) 使用非电离特拉赫兹波用于工业无损测试.
    • 当前的THz-CT方法通常假定直线传播,忽视不均材料中的显著波折射,从而限制了重建的准确性.

    研究的目的:

    • 为THz-CT.开发一个非线性前建模和重建框架.
    • 通过结合THz波折射的影响来解决现有方法的局限性.

    主要方法:

    • 基于斯内尔定律的代射线传播算法被开发为模拟非线性THz传播路径,包括未知的折射率和接口.
    • 一个无导数的微分演化算法被用来解决反射率重建的错位,非凸和非平滑的反向问题.
    • 传输系数恢复是用总变化 (TV) 规范化的优化问题来制定的,该优化问题使用乘数 (ADMM) 的交替方向方法来解决.

    主要成果:

    • 拟议的非线性框架在恢复折射率和接口几何后准确计算非线性THz路径.
    • 在真实THz数据集上的实验结果显示,与基于线性射线的方法相比,重建准确度显著提高.

    结论:

    • 开发的非线性前建模和重建框架有效地克服了THz-CT中线性假设的局限性.

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  • 这一进步为使用THz成像的非破坏性测试应用提供了更高的准确性.