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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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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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相关实验视频

Updated: Mar 13, 2026

A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia
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使用RF调节的相位基梯度回声成像进行定量扩散和T2映射.

Daiki Tamada1, Ali Pirasteh1,2, David F Jarrard3,4

  • 1Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Magnetic resonance in medicine
|March 12, 2026
PubMed
概括
此摘要是机器生成的。

一种新的基于相的扩散 (PBD) 方法在MRI中提供了高分辨率的定量扩散和T2映射. 这种技术减少了几何扭曲,显示了先进的前列腺成像应用的希望.

关键词:
射频调制的梯度回声成像成像技术表面扩散系数的明显扩散系数扩散扩散是一种扩散.阶段阶段阶段阶段的阶段.定量成像生物标志物生物标志物

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相关实验视频

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科学领域:

  • 磁共振成像技术 磁共振成像技术
  • 定量成像技术 定量成像技术
  • 生物医学工程 生物医学工程

背景情况:

  • 传统的扩散权重成像 (DWI) 患有几何扭曲.
  • 定量扩散和T2映射对于准确的组织表征至关重要.
  • 需要先进的MRI技术来克服当前方法的局限性.

研究的目的:

  • 引入和评估一种用于定量扩散MRI的新型射频相调节梯度回声 (GRE) 方法.
  • 评估这种方法用于高分辨率3D定量扩散/T2映射的可行性.
  • 为了减轻几何扭曲,并作为传统DWI的替代品.

主要方法:

  • 开发了一种基于相位的扩散 (PBD) 方法,使用射频相位调制来编码扩散和T2信息.
  • 通过代重建采用封闭形式的分析模型,用于联合明显扩散系数 (ADC) 和T2映射.
  • 通过布洛赫方程模拟,幻影实验和体内成像来评估可行性.

主要成果:

  • 模拟显示,与SS-EPI相比,PBD在较低的SNR下提供更准确的中位数ADC估计.
  • 幻影研究表明,PBD衍生ADC的良好一致性 (R2=0.99) 和T2的强相关性 (R2=0.89).
  • 前列腺疾病的体内成像显示了高分辨率的ADC和T2地图,几何扭曲最小.

结论:

  • 在幻影和活体中,PBD为ADC和T2地图提供了更好的几何准确性.
  • 该方法从噪音数据中提供了可靠的中位数ADC估计,如模拟所示.
  • PBD对高分辨率DWI应用有前途,特别是在前列腺MRI中.