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在便携式50mTMRI头部扫描仪上使用螺旋采集进行高效的成像
Yuxiang Zhang1, Wei He1, Lei Yang1
1School of Electrical Engineering, Chongqing University, Chongqing, China.
NMR in biomedicine
|June 28, 2023
概括
超低场 (ULF) 磁共振成像 (MRI) 噪声和模糊性通过一种新的螺旋式出序减少. 这种技术可以提高信号噪声比 (SNR) 的效率,从而在便携式MRI系统上获得更清晰的大脑成像.
科学领域:
- 医疗成像医学成像
- 生物物理学的生物物理.
- 电气工程 电气工程
背景情况:
- 超低场 (ULF) 磁共振成像 (MRI) 系统提供了便携性,但面临着低信号噪声比 (SNR) 的挑战,导致图像质量低下.
- 螺旋采集技术显示出高效的k空间覆盖率和在ULFMRI中提高SNR效率的前景.
- 解决噪音和模糊是提高ULFMRI诊断能力的关键.
研究的目的:
- 在便携式50mT系统上开发和评估用于脑成像的螺旋外MRI序列.
- 提高SNR效率,减少ULFMRI中的噪音和模糊工件.
- 在ULF背景下调查电磁干扰 (EMI) 取消和现场地图采集的有效性.
主要方法:
- 设计了一个新的螺旋式出序,结合了三个模块:噪声校准以取消EMI,嵌入式场地图获取以纠正相位错误,以及以优化低带宽采样进行成像.
- 图像重建利用了系统的缺陷,如梯度延迟和并发场.
- 拟议的方法与卡特西安收购和使用幻影和体内实验的最新EMI取消算法进行了比较.
主要成果:
- 螺旋式出序显示出较高的SNR效率,与卡特西安对应的相比.
- 在幻影和体内实验中,获得了23% - 44%的时间SNR改善.
- 该技术产生了大约80%的噪声抑制的无扭曲图像,超过了比较的EMI取消算法.
结论:
- 拟议的螺旋出序列有效地提高了SNR效率,并在ULFMRI脑成像中抑制噪声.
- 这种方法为便携式50mTMRI系统的图像质量改善提供了可行的解决方案.
- 未来的研究可以使用这种方法来探索各种图像对比度,以扩大ULF MRI应用.
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