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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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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小动物P心脏MR光谱:序列和设置优化

Matthias Luetgens1, Tobias Lindner2, Cajetan Lang3

  • 1Institute of Diagnostic and Interventional Radiology, Pediatric Radiology and Neuroradiology, Rostock University Medical Center, Rostock, Germany.

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优化-31磁共振光谱 (P MRS) 使用自由感应衰变与外部体积抑制 (FID与OVS) 可使小鼠心脏的体内代谢分析. 这种方法检测到肌肉心脏梗塞后的酸和氨酸三酸盐比率的显著变化.

关键词:
<sup>31</sup>P 的时间.自由的诱导衰变.这就是MRS MRS.在心肌中,心肌.小动物 小动物 小动物在X-核中.

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科学领域:

  • 生物物理学的生物物理.
  • 心血管研究研究心血管研究
  • 代谢成像 - 代谢成像

背景情况:

  • 在小鼠体内评估心肌代谢,由于心脏的动态性质和小尺寸存在挑战.
  • -31磁共振光谱 (P MRS) 是一种强大的代谢分析工具,但对于心脏应用需要优化实施.

研究的目的:

  • 调查和优化P MRS设置以确定小鼠心肌的代谢成分.
  • 在心脏成像中评估不同光谱序列的信号噪声比 (SNR) 和空间选择性.

主要方法:

  • 评估了线圈性质,并使用代谢物幻体 (腺三酸盐 (ATP) 和酸 (PCr)) 对比了光谱序列 (包括自由诱导衰变 (FID) 和图像选择的体内光谱 (ISIS)).
  • 使用外部体积抑制 (OVS) 来增强信号局部化并减少周围组织的污染.
  • 优化的设置在诱导心肌梗塞之前和之后的小鼠心跳中得到了证明.

主要成果:

  • 与OVS相结合的FID序列显示了最高的SNR,并实现了大约84%的邻近代谢物的抑制.
  • 在小鼠心脏中的体内研究显示,酸蛋白 (PCr) 与腺三酸盐 (ATP) 的比率从心脏病发作前的2.5下降到心脏病发作后的一周后的1.74.
  • 与OVS一起的FID提供了定位精度和采集效率之间的平衡,允许在约6.5分钟内进行测量.

结论:

  • 与OVS一起的FID是活体中31P鼠标心脏跳动的MRS的首选方法,与ISIS相比,它提供了优越的SNR和效率.
  • 优化的P MRS技术成功地揭示了心肌梗塞后心肌肌中的代谢变化.
  • 这种方法有助于清晰地检测PCr/ATP比率的变化,这对于理解心脏代谢重塑至关重要.