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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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无相极图像和光滑线圈灵敏度地图由调节的非线性反转.

Moritz Blumenthal1, Martin Uecker1,2,3,4

  • 1Institute of Biomedical Imaging, Graz University of Technology, Graz, Austria.

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

这项研究提出了一种新的方法来检测和纠正MRI图像重建中的相极,提高线圈灵敏度图的准确性. 该技术使得即使有有限的自动校准数据,也能够可靠地重建图像.

关键词:
这就是为什么MRI是MRI.图像重建 图像重建非线性反向问题并行成像并行成像阶段奇点的阶段奇点.

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 图像重建 图像的重建
  • 信号处理 信号处理

背景情况:

  • 阶段奇点或阶段极是MRI重建中的常见问题.
  • 这些奇点源自自动校准线圈灵敏度估计的固有模糊性.
  • 它们可能会降低重建的MRI图像的质量和准确性.

研究的目的:

  • 开发和验证一种检测和纠正相极的方法.
  • 在非线性反向 (NLINV) 重建中提高线圈灵敏度图的准确性.
  • 从有限的自动校准数据提高MR图像重建的可靠性.

主要方法:

  • 通过计算单个线圈灵敏度图中的卷曲来检测相极.
  • 卷曲的加权平均值用于强大的相极探测.
  • 检测和校正被整合到NLINV算法的高斯-牛顿方法中.
  • 该方法还被用于纠正ESPIRiT线圈灵敏度图中的相极.

主要成果:

  • 开发的方法可靠地去除相极,产生无奇点的线圈灵敏度配置文件.
  • 即使使用非常小的自动校准区域 (例如7x7像素),也可以实现精确的线圈灵敏度估计.
  • 该技术在加快卡特西安MPRAGE脑成像和实时心脏MRI上成功评估.

结论:

  • 拟议的方法有效地检测和纠正MRI重建中的相极.
  • 这导致了线圈灵敏度图的改进和更可靠的MR图像重建.
  • 这种方法增强了MRI中自动校准技术的实用性.