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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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相关实验视频

Updated: Jun 13, 2025

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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POSE:用于加速定量MRI的位置编码.

Albert Jang1, Fang Liu1

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States; Harvard Medical School, Boston, MA, United States.

Magnetic resonance imaging
|September 14, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了位置编码 (POSE),这是一种新的方法,可以通过使用亚声素转移来加快磁共振成像 (MRI) 扫描,以增强数据编码. POSE显著减少了扫描时间,同时保持了高质量的成像结果.

关键词:
基于模型的重建.摆姿势 (POSE) 是一种姿势.定量成像成像技术的使用.亚声元移动的移动T((1) 一个问题.可变的翻转角度可以改变.

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相关实验视频

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科学领域:

  • 医疗成像医学成像
  • 生物物理学的生物物理.
  • 信号处理 信号处理

背景情况:

  • 定量MRI (qMRI) 需要多次扫描,导致长时间的获取时间.
  • 现有的加速度方法往往会损害图像质量或增加噪声.
  • 需要更快,高分辨率的定量成像技术.

研究的目的:

  • 引入和验证加速MRI的新通用策略,称为位置编码 (POSE).
  • 证明POSE能够生成生物物理参数的加速和增强分辨率地图的能力.
  • 评估POSE的性能与传统方法相比,以及其进一步加速的潜力.

主要方法:

  • 开发了POSE框架,利用子声变换作为额外的编码源.
  • 使用数值布洛赫方程模拟 (数值和数字大脑幻影) 验证了方法.
  • 进行幻影 (NIST) 和体内实验,包括用于噪声分析的蒙特卡洛模拟.

主要成果:

  • 在各种T1值的数值模拟和幻影实验中,POSE与参考方法有很好的一致性.
  • 在体内结果显示与参考方法和优越的g因子很好地一致,与同等加速度的传统并行成像相比.
  • 将POSE与并行成像相结合,允许进一步加速,比标准并行成像有更好的噪声性能.

结论:

  • POSE是一种有效和有效的策略,可以加速定量核磁共振.
  • 该方法在扫描时间和噪声性能方面比现有技术提供了显著的改进.
  • POSE有望提高先进的MRI应用程序的效率和质量.