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相关概念视频

Magnetic Resonance Imaging01:24

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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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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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块间隔细分的回声平面成像,以改善在7T的亚毫米高分辨率功能性MRI中活动检测.

Guoxiang Liu1,2, Takashi Ueguchi1,2,3,4, Seiji Ogawa1,5

  • 1Brain Function Analysis and Imaging Laboratory, Center for Information and Neural Networks, Advanced ICT Research Institute, National Institute of Information and Communications Technology, Suita, Osaka, Japan.

Magnetic resonance in medicine
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概括

区块交联细分EPI (BISEPI) 通过改善时间信号噪声比 (tSNR) 和运动强度来增强功能性MRI (fMRI). 这种新的方法使得高分辨率的fMRI可以检测神经元活动,即使是短时间的刺激.

关键词:
这是一个大胆的表现.EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EPI EP1 EPI EPI EPI EP1 EPI EPI EP1 EPI EP1 EP1 EP2 EP3 EP2 EP3 EP4 EP4 EP4 EP4 EP4 EP4 EP4图像采集和重建的过程.k-空间细分的分段化分毫米高分辨率fMRI.超高磁场超高磁场的磁场.

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科学领域:

  • 神经成像是一种神经成像.
  • 磁共振成像是一种磁共振成像技术.
  • 功能性磁共振成像技术 功能性磁共振成像技术

背景情况:

  • 亚毫米高分辨率功能性MRI (fMRI) 能够进行中大尺度的神经元活动的调查.
  • 单拍回声平面成像 (EPI) 与并行成像 (例如,GRAPPA) 降低了时间信号噪声比 (tSNR),阻碍了检测任务唤起的活动.
  • 传统的多射击EPI (msEPI) 提高了SNR,但牺牲了时间分辨率,限制了其用于短期刺激的使用.

研究的目的:

  • 引入一种基于多次EPI的新型fMRI采集和重建方法,即区块交联细分EPI (BISEPI).
  • 克服现有的EPI技术在实现高时间分辨率和高SNR同时达到亚毫米 fMRI的局限性.
  • 为了能够在中等层次上进行神经元活动的非侵入性调查,提高灵敏度和运动强度.

主要方法:

  • 在获取和重建过程中,BISEPI使用了块设计范式的时机,以保持时间分辨率和SNR.
  • 整合了一个基于k空间的运动校正方法,以解决头部运动器件.
  • 该技术在人体研究中使用各种刺激范式和分辨率 (0.7毫米和0.4毫米同otropic) 进行了评估.

主要成果:

  • 比塞皮减少了与GRAPPA加速相关的g因子罚款.
  • 该方法实现了高 tSNR,增强了运动稳定性,并提高了对血液氧气水平依赖 (BOLD) 信号响应的敏感性.
  • 在亚毫米空间分辨率下,可以检测到BOLD信号响应.

结论:

  • BISEPI有效地解决了传统的msEPI和GRAPPA加速EPI的局限性.
  • 该方法可以在亚毫米空间分辨率 (0.7-mm和0.4-mm同otropic) 上检测BOLD信号响应.
  • BISEPI适用于fMRI范式,包括0.7毫米分辨率的短时间,低功率刺激和0.4毫米分辨率的标准功率刺激.