加快TOF-MRA:压缩灵敏度编码和螺旋成像的联合使用的影响
Kosuke Morita1, Hiroyuki Uetani2, Takeshi Nakaura2
1Department of Radiology, Kumamoto University Hospital, Honjo 1-1-1, Kumamoto, Japan.
Magnetic resonance imaging
|July 5, 2023
概括
压缩感觉 (CS) 和螺旋成像显著提高了飞行时间的磁共振血管学 (TOF-MRA) 速度. 结合的CS-螺旋技术在血管区域提供稳定的图像质量,优于单独的方法.
科学领域:
- 医疗成像医学成像
- 放射学 放射学是一门学科.
- 磁共振成像 (MRI) 是一种磁共振成像技术.
背景情况:
- 飞行时间磁共振血管造影 (TOF-MRA) 对于血管成像至关重要.
- 传统的TOF-MRA方法可能耗时,限制了临床应用.
- 加速成像技术,如压缩感官 (CS) 和螺旋成像,旨在减少扫描时间.
研究的目的:
- 在TOF-MRA中评估压缩感官 (CS) 和螺旋成像技术的图像质量.
- 为了比较CS-spiral TOF-MRA与传统和个体加速方法的性能.
- 为了评估CS螺旋技术提供的速度提升,它比传统方法快大约2.5倍.
主要方法:
- 在20名志愿者身上进行了四个TOF-MRA序列:SENSE (加速度因子4),CS (加速度因子10.9),螺旋和CS-螺旋 (两者采集时间为1:55分钟).
- 定量图像分析包括信号与噪声比率 (SNR),对比度和半最大全宽度 (FWHM) 测量.
- 定性分析涉及两名放射科医生评估CS,螺旋和CS-螺旋图像中的血管分支描绘,使用SENSE作为参考.
主要成果:
- 与SENSE相比,CS螺旋技术在前脑动脉 (ACA) 和基底动脉 (BA) 中显示出明显更高的对比度 (p < 0.001).
- 虽然螺旋和CS-螺旋成像显示BA SNR低于SENSE (p = 0.009),但螺旋成像损害了近端分支的描绘,CS成像损害了远端分支的描绘 (p < 0.001).
- 在螺旋或CS-螺旋和SENSE之间没有观察到FWHM的显著差异,表明稳定的边缘描绘.
结论:
- 与单独的CS或螺旋成像相比,TOF-MRA中的联合CS-螺旋技术显著提高了图像质量.
- CS-spiral在近端,中端和远端血管区域提供稳定的图像质量,优于单个加速技术.
- 这种更快的TOF-MRA方法为高效和有效的血管成像提供了一个有希望的替代方案.
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