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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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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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相关实验视频

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减少7T MR的短期效应与重复暴露.

Boel Hansson1,2, Benjamín Garzón3, Martin Lövdén4,5

  • 1Department of Medical Imaging and Physiology, Skåne University Hospital, Lund, Sweden. boel.hansson@med.lu.se.

Neuroradiology
|January 25, 2024
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概括
此摘要是机器生成的。

健康的受试者适应重复的超高波段 (UHF) 7特斯拉 (T) 磁共振 (MR) 扫描,随着时间的推移,经历的头和恶心等短期影响较少. 运动和外围神经刺激不受多次UHFMR暴露的影响.

关键词:
适应 适应 适应生物学 生物 生物学头 头 这种情况.磁共振成像技术 磁共振成像技术恶心 恶心 恶心

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科学领域:

  • 神经成像是一种神经成像.
  • 医学物理 医学物理

背景情况:

  • 超高场 (UHF) 磁共振 (MR) 成像,特别是在7特斯拉 (T),提供先进的诊断功能.
  • 虽然UHF MR通常耐受良好,但可能会引起过渡性副作用,如头和恶心.
  • 关于多次UHF MR暴露的累积影响的数据有限.

研究的目的:

  • 调查在每周重复接受7T MR检查的健康个体中对短期影响的主观经验.
  • 在7T的多功能MRI (fMRI) 会议期间评估运动工件的发生和变化.
  • 在七次连续的7T MR检查中评估受试者的适应能力和舒适度.

主要方法:

  • 使用问卷收集有关参与者经历的短期影响的数据.
  • 在fMRI运动技能研究中对每个参与者进行了每周七次7T MR检查.
  • 分析了使用统计模型在fMRI图像中报告的症状和定量运动的变化.

主要成果:

  • 共有360个问卷由67名参与者填写,分为一到七次考试.
  • 随着检查次数的增加 (p<0.03),观察到头,运动不一致,恶心和头痛的显著减少.
  • 不检测到重复暴露对外围神经刺激或受试者运动的显著影响;整体检查体验显著改善 (p<0.001).

结论:

  • 在多次7T MR检查中,健康的受试者表现出适应强静电磁场的能力.
  • 主观的短期影响,包括头,恶心和头痛,随着持续暴露而减少,与参与者的舒适度增加相关.
  • 重复的7T fMRI 会议不会导致对象运动的显著变化,这表明随着时间的推移,成像质量保持稳定.