Nayak Krishna S, Hargreaves Brian A, Hu Bob S, Nishimura Dwight G, Pauly John M, Meyer Craig H
Magnetic Resonance Systems Research Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California, USA.
Magn Reson Med. 2005 Jun;53(6):1468-73. doi: 10.1002/mrm.20489.
Balanced steady-state free precession (SSFP) sequences are useful in cardiac imaging because they achieve high signal efficiency and excellent blood-myocardium contrast. Spiral imaging enables the efficient acquisition of cardiac images with reduced flow and motion artifacts. Balanced SSFP has been combined with spiral imaging for real-time interactive cardiac MRI. New features of this method to enable scanning in a clinical setting include short, first-moment nulled spiral trajectories and interactive control over the spatial location of banding artifacts (SSFP-specific signal variations). The feasibility of spiral balanced SSFP cardiac imaging at 1.5 T is demonstrated. In observations from over 40 volunteer and patient studies, spiral balanced SSFP imaging shows significantly improved contrast compared to spiral gradient-spoiled imaging, producing better visualization of cardiac function, improved localization, and reduced flow artifacts from blood.
平衡稳态自由进动（SSFP）序列在心脏成像中很有用，因为它们具有高信号效率和出色的血液-心肌对比度。螺旋成像能够在减少血流和运动伪影的情况下高效采集心脏图像。平衡SSFP已与螺旋成像相结合用于实时交互式心脏磁共振成像。这种方法在临床环境中进行扫描的新特性包括短的、一阶矩归零的螺旋轨迹以及对带状伪影（SSFP特定信号变化）空间位置的交互式控制。本文证明了在1.5 T下进行螺旋平衡SSFP心脏成像的可行性。在超过40项志愿者和患者研究的观察中，与螺旋梯度回波成像相比，螺旋平衡SSFP成像显示出对比度显著提高，能更好地显示心脏功能、改善定位并减少血液流动伪影。
