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相关概念视频

Computed Tomography01:10

Computed Tomography

4.6K
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...
4.6K
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

2.4K
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...
2.4K
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

26
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...
26

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相关实验视频

Updated: Jul 16, 2025

Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging
08:55

Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging

Published on: July 12, 2022

4.9K

有效的代重建与光束形状补偿THz计算机断层扫描.

Lars-Paul Lumbeeck, Pavel Paramonov, Jan Sijbers

    Applied optics
    |September 14, 2023
    PubMed
    概括

    太赫兹计算机断层扫描 (CT) 重建是通过一个高效的代方法来改进的,该方法考虑了THz光束形状. 这种方法提高了图像分辨率,加速了融合,克服了传统方法的局限性.

    科学领域:

    • 医疗成像医学成像
    • 非破坏性测试是一种非破坏性测试.
    • 波浪物理 波浪物理

    背景情况:

    • 太赫兹 (THz) 计算机断层扫描 (CT) 是一种非破坏性,非电离化的成像技术.
    • 标准THz CT重建通常使用拉顿变换,假设直线传播,这对于有限宽THz光束是不准确的.
    • 在THz CT中忽略光束形状会导致图像模糊和代方法中的计算挑战.

    研究的目的:

    • 为THz CT开发一个高效的代重建算法,准确地建模THz光束形状.
    • 与现有方法相比,提高图像分辨率并降低计算需求.
    • 为了提高代重建过程的融合速度.

    主要方法:

    • 提出了一种高效的代重建算法,采用THz光束形状.
    • 开发了一个合适的先决条件来加速代重建的融合.
    • 使用数值模拟和实验数据验证了该方法.

    主要成果:

    • 提出的方法成功地将THz光束形状纳入了重建过程.
    • 在模拟和真实实验中观察到重建图像中的更好的分辨率恢复.
    • 预条件器显著提高了代重建的收速度.

    更多相关视频

    Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography
    08:04

    Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography

    Published on: March 12, 2017

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    Preparing Lamellae from Vitreous Biological Samples Using a Dual-Beam Scanning Electron Microscope for Cryo-Electron Tomography
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    Preparing Lamellae from Vitreous Biological Samples Using a Dual-Beam Scanning Electron Microscope for Cryo-Electron Tomography

    Published on: August 5, 2021

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    相关实验视频

    Last Updated: Jul 16, 2025

    Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging
    08:55

    Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging

    Published on: July 12, 2022

    4.9K
    Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography
    08:04

    Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography

    Published on: March 12, 2017

    9.3K
    Preparing Lamellae from Vitreous Biological Samples Using a Dual-Beam Scanning Electron Microscope for Cryo-Electron Tomography
    07:00

    Preparing Lamellae from Vitreous Biological Samples Using a Dual-Beam Scanning Electron Microscope for Cryo-Electron Tomography

    Published on: August 5, 2021

    3.4K

    结论:

    • 开发的代重建方法有效地解决了传统THz CT的局限性.
    • 精确的模拟THz光束形状导致优越的图像质量和重建效率.
    • 这些发现为更实用,更高分辨率的THz CT应用铺平了道路.