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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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一种基于的新型脉冲方法来测量CT时分辨率.

Naoki Nagasawa1, Satoshi Nakamura2, Jun Matsuo3

  • 1Department of Radiological Technology, Suzuka University of Medical Science, 1001-1, Kishioka, Suzuka, Mie 510-0293, Japan; Department of Radiology, Mie University Hospital, 2-174 Edobashi, Tsu, Mie 514-8507, Japan.

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概括
此摘要是机器生成的。

一种新的摆形方法提供了一种实用的方法来测量CT扫描中的时间分辨率 (TR),与传统方法的准确度相匹配. 这简化了TR评估,以便更好地进行心脏成像和研究.

关键词:
这就是为什么CTCTCTCTCTCT螺旋式扫描可以进行螺旋式扫描.冲动方法是一种冲动方法.运动文物 运动文物时间解决方案 时间解决方案时间敏感性个人资料

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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
  • 辐射物理学 辐射物理学

背景情况:

  • 高时分辨率 (TR) 在CT成像中至关重要,以最大限度地减少运动工件,特别是对于像心脏这样的动态结构.
  • 传统的TR测量方法,如脉冲法,通常需要专门的设备,限制了它们广泛的临床应用.

研究的目的:

  • 开发和验证一种基于摆摆的简化方法,用于测量CT中的时间分辨率 (TR).
  • 确认拟议的摆形方法能产生与既定常规方法相当的结果.

主要方法:

  • 时间分辨率 (TR) 通过新方法和传统的子方法进行了评估.
  • 对于每种方法,在0.8和1.2的度因子 (PF) 上收集了50次扫描的数据.
  • 使用半最大的全宽度 (FWHM) 和十分最大的全宽度 (FWTM) 来量化TR,并通过两个单面测试 (TOST) 确定等价性.

主要成果:

  • 在所有测试的参数上,摆子方法证明了与子方法的统计等价性.
  • 在PF 0.8时,FWHM值为0.55±0.03秒 (摆动) 和0.54±0.04秒 (弹),显示相当性 (TOST,p=0.005).
  • 在PF 1.2时,两种方法的FWHM值为0.15±0.01秒,也表明了统计学等价性 (TOST,p=0.021).

结论:

  • 摆子方法提供了一种简化和可重复的技术,用于CT中的时间分辨率 (TR) 测量.
  • 这种方法为医学成像中的临床和研究应用提供了更容易的参数优化.