摘要
在磁共振非均匀场成像中 ,传统的射频脉冲导致回波信号的衰减 .为了减小和消除这种磁共振信号的衰减 ,在讨论了经典理论的基础上根据非线性动力学中的逆散射理论和Shinnar LeRoux方法导出了用于非均匀场成像的射频脉冲设计方法 .模拟结果表明 ,采用逆散射理论和Shinnar
In the problem of nonhomogeneous field magnetic resonance imaging (MRI) echo peaks decay quickly due to traditional design of radio frequency (RF) pulse. In this article, using inverse scattering transform (IST) of the nonlinear dynamics and Shinnar-Le Roux selective excitation pulse design algorithm (SLR Algorithm) we have designed the RF pulse for the nonhomogeneous field MRI. Simulation has been made to test the signal loss induced by the excitation of different types of RF pulses. Simulation results show that the RF pulse sequence optimized by IST and SLR algorithm can improve the signal to noise ratio of MRI considerably
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第5期1143-1150,共8页
Acta Physica Sinica
基金
北京市自然科学基金重点项目 (批准号 :30 110 0 2 )
科技部十五科技攻关项目 (批准号 :2 0 0 1BA70 6B0 2 )资助的课题~~