Detailing the use of magnetohydrodynamic effects for synchronization of MRI with the cardiac cycle: A feasibility study
Detailing the use of magnetohydrodynamic effects for synchronization of MRI with the cardiac cycle: A feasibility study
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DOI：
10.1002/jmri.23634
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发表时间：
2012-08-01
影响因子：
4.4
通讯作者：
Niendorf, Thoralf
中科院分区：
文献类型：
--
作者：
Frauenrath, Tobias;Fuchs, Katharina;Niendorf, Thoralf
目的：探讨利用磁流体动力学（MHD）效应实现磁共振成像（MRI）与心动周期同步的可行性。材料和方法：在B0 = 7.0T的条件下，使用脉动流模型观察MHD效应。在健康志愿者（n = 10）体内检查了B0范围为0.057.0 T的MHD效应。采用门控稳态自由进动（SSFP）成像技术结合心电图（ECG）和MHD同步进行颈动脉非对比增强MR血管造影（MRA）。结果：磁流体动力学电位与相衬MRI的血流速度相关。MHD电压取决于B0和导电流体流动之间的方向。电极间间距沿着流动的增加增加了MHD潜力。在B0 = 7.0 T时，MHD效应的体内测量提供了靠近颈总动脉的表面区域的1.5 mV峰值电压。使用MHD触发使MRI与心动周期同步是可行的。MHD触发的3.0 T颈动脉MRA显示了整体图像质量和丰富的解剖细节，与ECG触发的MRA相当。结论：本可行性研究证明了MHD效应用于MR采集与心动周期同步。J.磁共振Imaging 2012; 36：364372. (c)2012 Wiley Periodicals，Inc.
Purpose: To investigate the feasibility of using magnetohydrodynamic (MHD) effects for synchronization of magnetic resonance imaging (MRI) with the cardiac cycle. Materials and Methods: The MHD effect was scrutinized using a pulsatile flow phantom at B0 = 7.0 T. MHD effects were examined in vivo in healthy volunteers (n = 10) for B0 ranging from 0.057.0 T. Noncontrast-enhanced MR angiography (MRA) of the carotids was performed using a gated steady-state free-precession (SSFP) imaging technique in conjunction with electrocardiogram (ECG) and MHD synchronization. Results: The MHD potential correlates with flow velocities derived from phase contrast MRI. MHD voltages depend on the orientation between B0 and the flow of a conductive fluid. An increase in the interelectrode spacing along the flow increases the MHD potential. In vivo measurement of the MHD effect provides peak voltages of 1.5 mV for surface areas close to the common carotid artery at B0 = 7.0 T. Synchronization of MRI with the cardiac cycle using MHD triggering is feasible. MHD triggered MRA of the carotids at 3.0 T showed an overall image quality and richness of anatomic detail, which is comparable to ECG-triggered MRAs. Conclusion: This feasibility study demonstrates the use of MHD effects for synchronization of MR acquisitions with the cardiac cycle. J. Magn. Reson. Imaging 2012;36:364372. (c) 2012 Wiley Periodicals, Inc.