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相关概念视频

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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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个别优化的动态并行传输脉冲用于7T的3D高分辨率空间成像.

Gian Franco Piredda1, Emilie Sleight2,3, Thomas Yu1,4,5

  • 1Swiss Innovation Hub, Siemens Healthineers International AG, Lausanne, Switzerland.

Magnetic resonance in medicine
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概括
此摘要是机器生成的。

动态并行传输 (pTx) 脉冲通过实现均的翻转角度分布来改善7T MRI SPACE成像. 这导致更好的图像质量,并使先进的MRI序列在更高场强度的临床应用成为可能.

关键词:
迪尔迪尔 (DIR) 是一个一个闪耀的火焰焦点聚焦 在焦点聚焦.空间空间 空间空间动态的 pTx超高场核磁共振 (MRI) 是一种超高场核磁共振.全球脉冲是一种普遍的脉冲.

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 生物医学工程 生物医学工程
  • 物理 物理学 物理

背景情况:

  • 临床7TMRI提供优越的信号噪声比 (SNR) 和光谱分辨率,与较低的场强度相比.
  • 在7TMRI中,实现空间均的翻转角度分布是一个重大挑战,特别是在采样完美与应用优化对比度使用不同的翻转角度演变 (SPACE) 序列的情况下.
  • SPACE 序列使用长列重定焦脉冲,具有不同的翻转角度,加剧了翻转角度不均性问题.

研究的目的:

  • 调查可扩展的动态并行传输 (pTx) 脉冲的有效性,以实现7T的均3D高分辨率SPACE脑成像.
  • 为了应对在7T SPACE序列中空间均翻转角度分布的挑战.
  • 为了使7T应用广泛使用的临床对比度,并提高图像质量.

主要方法:

  • 非参数化和可扩展的动态pTx脉冲是使用快速在线定制 (FOCUS) 设计的,用于SPACE序列中的激发,重新聚焦和反转.
  • 优化涉及使用B0和多通道B1+地图以在特定吸收率 (SAR) 约束下实现翻转角度均性.
  • 用获得的B0和B1+地图来定制特定对象的pTx脉冲,并强制执行一个对称条件以实现可扩展性. 在7T时获得的T1,T2,FLAIR和DIR SPACE图像在5名健康受试者中获得,以与传统的循环偏振 (CP) 脉冲进行比较.

主要成果:

  • 使用FOCUS pTx脉冲获得的图像显示,与传统的CP脉冲相比,在所有对比度中,SNR和同质性得到了改善.
  • 定量分析显示,图像强度的变化系数 (COV) 显著降低,特别是在小脑.
  • FLAIR图像显示了显著的46%的COV减少,这表明图像同质性得到了显著改善.

结论:

  • 个别优化的动态pTx脉冲用于7T的3D高分辨率SPACE成像,成功实现了临床上可接受的图像均性.
  • 开发的FOCUS脉冲可以在7T时应用广泛使用的临床对比物,如FLAIR和DIR.
  • 这一进步克服了7TMRI的一个关键局限性,为其更广泛的临床采用铺平了道路.