波谱学杂志2018，Vol.35Issue(2)：141-149,9.DOI:10.11938/cjmr20172596
用于同时多层MRI的选择性射频脉冲的优化设计
Optimization of Selective Radio Frequency Pulses for Simultaneous Multi-Slice MRI
摘要
Abstract
Simultaneous multi-slice magnetic resonance imaging (MRI) has attracted much research interests recently due to its advantages in increasing signal-to-noise ratio(SNR)and decreasing acquisition time.To achieve simultaneous multi-slice excitation, the existing methods used a composite excitation pulse, yielded from the linear combination of radio frequency (RF) pulses with the same amplitude but different phases. The performance of such composite pulse, however, is limited, due to the square relationship between the peak pulse power and slice number. To solve this problem, we proposed a numerical optimization method for multi-slice excitation RF pulse based on both spin dynamics and optimal control theory. Together with slice selection gradient, the optimized pulse achieved selective excitation with arbitrary thickness, distance and number of slices. The performance of the optimized pulse in simultaneous multi-slice MRI was validated by simulation on multimodal imaging-based detailed anatomical (MIDA) digital phantom.关键词
同时多层成像/优化控制/数值优化/激发轮廓Key words
simultaneous multi-slice MRI/optimal control/numerical optimization/excitation profile分类
数理科学引用本文复制引用
卢杉,常严,钱嵩松,施波,杨晓冬..用于同时多层MRI的选择性射频脉冲的优化设计[J].波谱学杂志,2018,35(2):141-149,9.基金项目
国家自然科学基金资助项目(11505281,11675254) （11505281,11675254）
江苏省社会发展面上项目(BE2017670). （BE2017670）
