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通过使用元阵列结构在超高场系统中增强大脑MRI

Akbar Alipour¹, Alan C Seifert¹, Bradley N Delman²

¹BioMedical Engineering and Imaging Institute and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York City, New York, USA.

Medical physics

|October 24, 2023

概括

一种新的元阵列通过改善关键大脑区域的信号噪声比 (SNR) 来增强7特斯拉 (7T) 核磁共振扫描. 这项技术提高了图像质量,并可以实现更快的扫描或更高分辨率,以改善神经影像.

科学领域:

医疗成像医学成像
电磁主义电磁主义
材料科学材料科学材料科学

背景情况:

超高波段 (UHF) 磁共振成像 (MRI) 提供更高的信号噪声比 (SNR),但受到射频 (RF) 不同质性的影响,限制了大脑覆盖范围.
现有的解决方案,如并行传输系统和被动闪,有缺点,包括成本,复杂性和材料不稳定性.
超表面,工程电磁结构,显示控制电磁波的希望,并已被探索为MRI增强.

研究的目的:

为了评估一种新型元阵列在增强大脑MRI时的有效性7特斯拉 (7T).
超阵列是分环共振器和高允许度材料的混合体,旨在改善小脑,脑干和下叶在7T的SNR.
评估这项技术对脑MRI图像质量和解剖覆盖的影响.

主要方法:

使用数值电磁模拟来优化元阵列设计和射频电路.
在幽灵和健康志愿者身上进行实验分析,使用7TMRI扫描仪与标准的32通道接收线圈进行了实验.
图像采集是使用渐变回忆回声 (GRE) 和轮回转回声 (TSE) 序列进行的,具有和没有元阵列.

主要成果:

幻影研究表明,目标地区的发射效率增加了两倍,信号灵敏度增加了1.4倍.
在体内成像显示使用元阵列可以改善小脑,脑干和椎脊髓的可视化.
GRE和TSE图像显示下层大脑结构的细节增强.

结论:

该元阵列有效地增强了SNR,扩大了解剖覆盖范围,并提高了7T标准MRI线圈的性能.
这种SNR增强允许在相同的采集时间内进行更高分辨率的成像,或者在同等分辨率下更快的扫描.
该技术提供了一种实际的方法来改进现有的7TMRI系统,用于全脑成像和其他应用.

关键词:

大脑MRI脑部MRI脑部高通透性的材料具有很高的通透性.这是一个元阵列.无线电频率无线电频率的使用.分环共振器的共振器是分环共振器.超高电场的超高电场.

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