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相关概念视频

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.
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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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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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Classification of Bones01:18

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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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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
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相关实验视频

Updated: Jul 16, 2025

Human Brown Adipose Tissue Depots Automatically Segmented by Positron Emission Tomography/Computed Tomography and Registered Magnetic Resonance Images
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使用双能量CT进行材料分解,并进行无监督学习.

Hui-Yu Chang1, Chi-Kuang Liu2, Hsuan-Ming Huang3

  • 1Institute of Medical Device and Imaging, College of Medicine, National Taiwan University, No.1, Sec. 1, Jen Ai Rd., Zhongzheng Dist., Taipei City, 100, Taiwan.

Physical and engineering sciences in medicine
|September 11, 2023
PubMed
概括
此摘要是机器生成的。

深度图像预先 (DIP) 增强了从双能CT (DECT) 图像中的材料分解 (MD). 这种无监督的方法可以提高骨和软组织成像的图像质量和降低噪音.

关键词:
深度图像之前的图像.双能量计算机断层扫描技术材料分解 材料分解

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科学领域:

  • 医疗成像医学成像
  • 计算成像技术的成像
  • 人工智能在医学中的应用

背景情况:

  • 从双能计算断层扫描 (DECT) 来进行材料分解 (MD) 对定量成像至关重要.
  • 传统的直接倒置方法会放大噪声,降低分解材料图像的质量.

研究的目的:

  • 引入和评估使用深度图像先验 (DIP) 的无监督图像域MD方法.
  • 评估基于DIP的MD的可行性,用于将DECT图像分解为两种 (骨,软组织) 和三种 (骨,软组织,脂肪) 基础材料.

主要方法:

  • 对患者的非对比性脑DECT扫描进行了回顾性分析.
  • 应用一种基于DIP的新算法,用于无监督材料分解.
  • 使用信号噪声比率 (SNR) 和调制转移函数 (MTF) 评估分解的图像.

主要成果:

  • 与直接倒置和代方法相比,基于DIP的方法在软组织图像中显著改善了SNR.
  • 对于两种和三种材料分解,观察到类似的MTF曲线.
  • 在三种材料分解中,DIP方法证明了优越的材料分离能力.

结论:

  • 提出的基于DIP的方法有效地从DECT数据中生成高质量的基础材料图像,而不需要培训数据集.
  • 这种无监督的方法为减少噪音和提高DECT材料分解中的图像质量提供了有希望的解决方案.