概括
这项研究介绍了多拍双极性GRAPPA (msDPG),这是一个用于在多拍回声平面成像 (EPI) 中纠正尼奎斯特幽灵的新方法. msDPG显著提高了图像保真度,使先进的MRI扫描仪能够进行高分辨率成像.
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
- 医学物理 医学物理
背景情况:
- 尼奎斯特幽灵是回声平面成像 (EPI) 中的文物,降低了图像质量.
- 多射击EPI技术容易受到这些工件的影响,特别是在具有高性能梯度或超高电场的扫描仪上.
- 现有的校正方法,如线性相位校正 (LPC),在处理复杂的幽灵模式方面存在局限性.
研究的目的:
- 开发一种强大的尼奎斯特幽灵校正方法,专门用于多次射击EPI.
- 为了解决先进的MRI系统中遇到的具有挑战性的幽灵文物.
- 为了提高多次EPI收购的忠诚度和分辨率.
主要方法:
- 通过将双极性GRAPPA (DPG) 扩展到多射击读数,开发了多射击双极性GRAPPA (msDPG).
- 使用量身定制的DPG内核来纠正LPC无法处理的高级阶段差异.
- 集成先进的调节器用于生理学间射击相位变化校正,并提出了校准精细化方法.
主要成果:
- 与LPC相比,msDPG表现出优异的幽灵校正,在幻影和体内实验中,幽灵与信号比率 (GSR) 降低了50%以上.
- 与传统的DPG相比,实现了较低的噪声放大,特别是具有较大的飞机内加速.
- 启用了高保真度,亚毫米扩散成像与规范化重建.
结论:
- 拟议的msDPG方法为多镜头EPI提供了强大的尼奎斯特幽灵校正.
- 这种技术可以实现高准确度的亚毫米成像,克服了以前方法的局限性.
- msDPG在具有高性能梯度和超高强度场的扫描仪上特别有效.
更多相关视频
09:01Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
Published on: April 4, 2017
8.8K
08:18High-Accuracy Correction of 3D Chromatic Shifts in the Age of Super-Resolution Biological Imaging Using Chromagnon
Published on: June 16, 2020
7.6K
相关概念视频
01:14NMR Spectrometers: Resolution and Error Correction
776
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...
776
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
519
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
519