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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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Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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相关实验视频

Updated: Jul 17, 2025

Array Tomography Workflow for the Targeted Acquisition of Volume Information using Scanning Electron Microscopy
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Array Tomography Workflow for the Targeted Acquisition of Volume Information using Scanning Electron Microscopy

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自主电子断层扫描重建与机器学习.

William Millsaps1, Jonathan Schwartz2, Zichao Wendy Di3

  • 1Department of Nuclear Engineering & Radiological Sciences, University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109, USA.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|August 28, 2023
PubMed
概括
此摘要是机器生成的。

电子断层扫描中的压缩传感 (CS) 提高了分辨率,但需要仔细调整参数. 本研究介绍了贝叶斯优化与基于动量的CS来自动选择参数,显著减少计算时间和提高3D重建质量.

关键词:
在3D成像中使用3D成像.这是一个声音.这就是TEMEM.贝叶斯的优化是贝叶斯的优化.压缩感应传感器 压缩感应化-ETET可以使用.电子断层扫描是一种电子断层扫描.高斯的过程是高斯的过程.机器学习是机器学习.尼斯特罗夫势头的发展势头

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相关实验视频

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科学领域:

  • 材料科学 材料科学 材料科学
  • 影像科学 影像科学
  • 计算科学 计算科学

背景情况:

  • 现代电子断层扫描通过使用压缩传感 (CS) 方法,在较低剂量下实现更高分辨率.
  • 在CS断层扫描中,以稀疏度强调的重建算法依赖于可调节的参数,这些参数对重建质量产生重大影响.

研究的目的:

  • 调查CS断层扫描中可调节参数对重建质量的影响.
  • 开发一种自动化方法,用于CS断层扫描中高效的参数选择.
  • 为了减少电子断层扫描中3D重建的计算时间.

主要方法:

  • 帕雷托前线分析以确定最佳的参数权重,以最大限度地减少总变化 (TV).
  • 将动量纳入梯度下降算法,以减轻CS重建中的过度平滑.
  • 贝叶斯优化与高斯过程的应用,用于自动断层扫描参数选择.

主要成果:

  • 重量加重的电视最小化可重复地产生高质量的断层图像.
  • 过度的电视最小化导致过度平滑的三维 (3D) 重建.
  • 基于动量的CS和贝叶斯优化将SrTiO3纳米立方体重建的计算时间减少了80%.
  • 自动参数选择对于大规模的断层学模拟至关重要.

结论:

  • 基于动量的压缩传感断层扫描,结合贝叶斯优化,为3D材料表征提供了一种高效和强大的方法.
  • 自动参数选择对于推进电子断层扫描对各种材料的3D表征能力至关重要.