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PRIME:相位逆转交叉多回声采集使得高加速度的无扭曲扩散MRI能够实现

Yohan Jun, Qiang Liu, Ting Gong

|September 24, 2024

概括

一个新的相反交联多回声采集 (PRIME) 能够实现高度加速的,无扭曲的扩散MRI (dMRI). 这种先进的技术使用额外的回声来提高图像质量和速度,而不会增加扫描时间.

科学领域:

磁共振成像是一种磁共振成像技术.
神经成像是一种神经成像.
生物医学工程生物医学工程

背景情况:

扩散MRI (dMRI) 对于神经成像至关重要,但通常受到扫描时间和图像扭曲的限制.
需要加速采集技术来提高dMRI的效率和分辨率.
通用切片模拟增强分辨率 (gSlider) 能够实现体积dMRI,但需要强大的加速度方法.

研究的目的:

开发和验证一种新型脉冲序列,用于高度加速,无扭曲的dMRI.
在不延长重复时间 (TR) 的情况下,将额外的回声集成到获取中.
为了利用gSlider编码进行高效的体积dMRI采集.

主要方法:

开发了相反交联式多回声采集 (PRIME) 序列.
PRIME包含两个回声:一个用于高分辨率扩散加权成像 (DWI),另一个用于场地图估计或扩散放松计.
在使用临床和Connectome 2.0扫描仪的健康志愿者体内评估PRIME.

主要成果:

从一个低分辨率的第二次回声中使用高准确度的场地图实现了5倍的平面加速.
启用使用双回声PRIME数据进行高分辨率扩散放松计参数估计.
在Connectome 2.0扫描仪上以550μm的同位素分辨率在体内展示了高保真度介面尺度DWI.

结论:

PRIME 序列可提供高度加速,高分辨率和无扭曲的dMRI.
在不延长扫描时间的情况下整合额外的回声是一个关键的创新.
在先进的dMRI应用中,PRIME有效地使用gSlider编码.

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