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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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Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
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Brain Imaging01:14

Brain Imaging

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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic...
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Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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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

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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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模拟白质微结构使用扩散OGSEMRI:模型和分析选择.

Emma Friesen1, Madison Chisholm2, Bibek Dhakal3

  • 1Department of Chemistry, University of Winnipeg, Winnipeg, MB, Canada.

Magnetic resonance imaging
|August 22, 2024
PubMed
概括
此摘要是机器生成的。

这项研究比较了使用磁共振成像 (MRI) 的白质微观结构分析方法. 使用AxCaliber频率依赖外轴扩散 (ACD) 模型的基于兴趣区域的分析和使用ActiveAx频率依赖外轴扩散 (AAD) 的基于voxel的分析是最佳的.

关键词:
扩散扩散是一种扩散.磁共振成像技术 磁共振成像技术数学的建模数学建模这就是OGSE的原因.基于Voxel的分析.

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相关实验视频

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科学领域:

  • 神经科学是一个神经科学.
  • 生物物理学的生物物理.
  • 医疗成像医学成像

背景情况:

  • 白质 (WM) 微观结构的改变是神经退行性疾病的关键.
  • 目前的ex vivo电子显微镜方法是侵入性的.
  • 磁共振成像 (MRI) 提供非侵入性体内评估.

研究的目的:

  • 为了研究和比较基于兴趣的区域分析 (RBA) 和基于Voxel的分析 (VBA) 的WM微观结构.
  • 评估四种数学模型:ActiveAx频率独立的轴外扩散 (AAI),ActiveAx频率依赖的轴外扩散 (AAD),AxCaliber频率独立的轴外扩散 (ACI) 和AxCaliber频率依赖的轴外扩散 (ACD).
  • 为了确定最佳的组合,准确和高效的WM微观结构分析.

主要方法:

  • 在7T和15.2T的两只老鼠大脑样本的分析.MRI.
  • 使用RBA和VBA与AAI,AAD,ACI和ACD模型的应用.
  • 参数配合精度,计算负载和分析时间的比较.

主要成果:

  • AAI和AAD模型给出了诸如轴突直径和扩散系数等参数的单一值.
  • ACI和ACD模型提供了轴突直径分布.
  • 使用AxCaliber频率依赖外轴扩散 (RBA-ACD) 的基于兴趣区域的分析和使用ActiveAx频率依赖外轴扩散 (VBA-AAD) 的基于Voxel的分析显示出最佳性能.

结论:

  • 建议使用RBA-ACD和VBA-AAD进行准确和及时的白质微观结构分析.
  • 该研究提供了全面的比较,以指导研究人员选择合适的模型和方法.
  • 这项工作推进了神经系统疾病中白质的非侵入性体内特征的研究.