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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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相关实验视频

Updated: Jun 13, 2025

In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging
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In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging

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4D流动MRI速度不确定性量化量化.

Sean M Rothenberger1, Jiacheng Zhang2, Michael Markl3

  • 1Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, USA.

Magnetic resonance in medicine
|September 13, 2024
PubMed
概括
此摘要是机器生成的。

一种新方法用速度距离 (VD) 度量化了4D流MRI速度测量的不确定性. 这提高了用于临床比较的4D流MRI数据的可靠性.

关键词:
血液动力学 血液动力学磁共振测速仪 (MRV) 是一种磁共振测速仪.阶段对比磁共振成像 (PC-MRI) 的使用.

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科学领域:

  • 医疗成像医学成像
  • 心血管成像 - 心血管成像
  • 生物医学工程 生物医学工程

背景情况:

  • 4D流MRI提供了宝贵的血液动力学信息.
  • 量化速度测量不确定性对于可靠的解释至关重要.
  • 现有的方法缺乏全面的不确定性评估.

研究的目的:

  • 开发一种自动方法,用于在4D流MRI中对voxel的不确定性进行估计.
  • 引入速度距离 (VD) 度量作为4D流MRI速度质量的度量.

主要方法:

  • 为了局部速度误差差值,利用质量保存.
  • 使用标准化平均差异 (SDM) 进行速度误差相关.
  • 以Mahalanobis距离评估VD;通过合成和体外验证.

主要成果:

  • 这种方法对别名,噪音,分辨率和相封装敏感.
  • 准确评估速度错误相关性 (<3.2%).
  • 在体内表现出与对比度和缩性流量增加的速度质量.

结论:

  • 该方法量化了来自噪声,相散和别名的速度误差.
  • 能够在不同研究和系统中严格比较4D流MRI数据集.