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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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相关实验视频

Updated: May 5, 2026

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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从双扩散编码MRI测量线性旋转不变的曲.

Hunter G Moss1, Thorsten Feiweier2, Andreana Benitez3

  • 1Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, United States of America.

Magnetic resonance imaging
|April 28, 2025
PubMed
概括

双扩散编码的MRI曲解测量可以根据显微异构或水交换对多个高斯区模型进行分类. 简化方法可以准确估计这些重要的扩散MRI指标.

关键词:
脑子 脑子 脑子 脑子双扩散编码的核磁共振成像 (MRI).库尔托斯 (Kurtosis) 是一种短线运动.卡尔格公司的模型.微观的异构性微观的异构性旋转不变数是旋转不变数.交换水 交换水 交换水

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相关实验视频

Last Updated: May 5, 2026

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科学领域:

  • 扩散MRI物理学的物理学
  • 生物物理建模 生物物理建模
  • 神经成像分析分析神经成像分析

背景情况:

  • 双扩散编码 (DDE) MRI提供了超越传统扩散张力成像的先进扩散度量.
  • 多重高斯区间 (MGC) 模型用于表示生物组织中复杂的水扩散.
  • 了解微观异构和水交换对于准确的组织微观结构表征至关重要.

研究的目的:

  • 为了充分描述DDE的线性旋转不变曲解测量,MRI.
  • 证明这些措施在区分MGC模型中的实用性.
  • 提出简化的获取和分析协议,用于估计质量测量.

主要方法:

  • 导出和识别四个基本的DDEMRI皮质不变因子.
  • 应用不变量来分类基于异构和交换的MGC模型.
  • 对微观分数异构 (μFA) 的交换效应的研究.
  • 开发和验证简化的DDE MRI采集和分析方案.

主要成果:

  • 库尔托सिस不变量与MGC模型保持一致,在大脑区域表现出微观异性异性.
  • 有证据表明,水交换会影响灰质中的μFA估计值.
  • 提出的简化方法在人类大脑数据上被成功证明.

结论:

  • 测量DDEMRI的皮质量可以有效地区分MGC模型与微观异构或水交换.
  • 简单的获取和分析方案使得这些不变量的可靠估计成为可能.
  • 研究结果支持使用具有显微异构的MGC模型,并突出显示了水交换在脑扩散建模中的重要性.