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相关概念视频

Computed Tomography01:10

Computed Tomography

7.9K
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...
7.9K
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

2.8K
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...
2.8K
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

1.8K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
1.8K
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

268
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...
268
Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

911
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
911

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相关实验视频

Updated: Jan 11, 2026

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
05:05

Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

Published on: November 23, 2019

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快速的3D部分边界数据 EIT重建使用直接倒置 CGO 基于的方法.

S J Hamilton, P A Muller, V Kolehmainen

    IEEE transactions on bio-medical engineering
    |November 17, 2025
    PubMed
    概括

    本研究介绍了使用部分边界数据进行电阻断层扫描 (EIT) 的快速3D重建方法. 这些新的算法使得即使有有限的传感器数据,也能够实现快速,准确的成像,优于传统的代方法.

    科学领域:

    • 医疗成像医学成像
    • 电气工程 电气工程
    • 计算科学 计算科学

    背景情况:

    • 电阻断层扫描 (EIT) 传统上需要完整的边界数据来进行准确的3D重建.
    • 对EIT的代方法在计算上昂贵,限制了它们在时间敏感的医疗应用中的使用.
    • 部分边界数据采集在医疗EIT中很常见,需要先进的重建算法.

    研究的目的:

    • 为EIT开发和评估使用部分边界数据的快速3D图像重建方法.
    • 为了使不完整的测量集能够进行绝对和时间差异EIT成像.
    • 为了克服代EIT重建技术的计算限制.

    主要方法:

    • 基于几何光学的两种方法被开发出来:卡莱伦的线性里叶变换方法和texp非线性里叶变换方法.
    • 这些方法使用模拟和实验数据进行了验证.
    • 重建与标准线性差异成像和总变异调整技术进行了比较.

    主要成果:

    • 提出的方法在绝对和时间差异EIT中实现了良好的目标定位.
    • 即使当域的重要部分无法进行测量时,也被证明是有效的成像,例如在中风监测中.
    • 这些算法成功地处理了域建模中的高噪音和不准确性.

    更多相关视频

    Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions
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    Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions

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    Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography

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    相关实验视频

    Last Updated: Jan 11, 2026

    Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
    05:05

    Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

    Published on: November 23, 2019

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    Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions
    13:43

    Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions

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    Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography
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    Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography

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    结论:

    • 开发的算法在不到2秒的时间内提供了信息性的EIT图像,比代方法快得多.
    • 这些非代算法适用于复杂的域形状,并在具有挑战性的条件下强大执行.
    • 快速重建能力解决了医疗EIT应用程序中的快速成像需求,这些应用程序受到局部边界数据的限制.