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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

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Three-Dimensional Phase Resolved Functional Lung Magnetic Resonance Imaging
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循环恒星MRI的基于模型的重建.

Haowei Xiang1, Jeffrey A Fessler1,2, Douglas C Noll2

  • 1EECS, University of Michigan, Ann Arbor, Michigan, USA.

Magnetic resonance in medicine
|January 29, 2024
PubMed
概括
此摘要是机器生成的。

本研究引入了一种新的基于模型的重建方法,用于渐变回声 (GRE) 成像,改善空间分辨率和减少文物. 这种先进的技术通过最大限度地减少重叠的回声和低样本文物来增强功能性MRI (fMRI) 结果.

关键词:
中兴通讯公司 ZTE基于模型的重建.沉默的MRI是什么?

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科学领域:

  • 医疗成像医学成像
  • 生物医学工程 生物医学工程
  • 信号处理 信号处理

背景情况:

  • 传统的格子和基于模型的梯度回声 (GRE) 图像重建方法通常牺牲信号噪声比 (SNR) 和空间分辨率.
  • 准确的信号采集和重建建模对于高质量的MRI至关重要.

研究的目的:

  • 为GRE图像开发一种先进的重建方法,可以完全模拟采集信号.
  • 与现有技术相比,在SNR和空间分辨率方面提高图像质量.

主要方法:

  • 开发了一种新的方法,模拟了扬声轨迹和重叠的回声 (回声入/回声出混合).
  • 采用两个系统矩阵来表示重叠的回声.
  • 使用结合梯度算法 (CG-SENSE) 与非均快速里叶变换 (NUFFT) 进行图像重建优化.

主要成果:

  • 在幻影和体内活体志愿者研究中证明了3D高分辨率T2*加权成像和功能性MRI (fMRI) 的有效性.
  • 高分辨率协议显示空间分辨率得到改善,信号损失减少,因为与格子相比,声内脱相较少.
  • 使用基于模型的方法,fMRI任务揭示了减少的文物和模糊,使用基于模型的方法更稳定和突出的时间过程.

结论:

  • 拟议的基于模型的重建方法显著提高了空间分辨率,并减少了GRE成像中的工件.
  • 在fMRI任务中观察到增强的时间序列和激活地图,这归因于缓解重叠的回声和低样本文物.