基于AFI的快速发射场B1+成像方法

doi:10.11938/cjmr20160401

波谱学杂志 ›› 2016, Vol. 33 ›› Issue (4): 515-527.doi: 10.11938/cjmr20160401

基于AFI的快速发射场B₁⁺成像方法

周子堃^1,2, 胡凌志³, 蒋瑞瑞³, 贺强³, 张卫国³, 陈群¹

1. 高端医学影像技术研究中心(中国科学院上海高等研究院), 上海 201210;
2. 中国科学院大学, 北京 100049;
3. 上海联影医疗科技有限公司, 上海 201800

收稿日期:2016-01-11 修回日期:2016-10-23 出版日期:2016-12-05 发布日期:2016-12-05
通讯作者: 陈群,电话:021-67076980,E-mail:qun.chen@sari.ac.cn E-mail:qun.chen@sari.ac.cn
作者简介:周子堃(1991-),女,硕士研究生,生物工程专业
基金资助:
中国科学院重点部署项目（Y325511211）.

Rapid B₁⁺ Mapping Based on Actual Flip-Angle Imaging

ZHOU Zi-kun^1,2, HU Ling-zhi³, JIANG Rui-rui³, HE Qiang³, ZHANG Wei-guo³, CHEN Qun¹

1. Center for Advanced Medical Imaging Technology, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Shanghai United Imaging Healthcare Cooperation, Shanghai 201800, China

Received:2016-01-11 Revised:2016-10-23 Online:2016-12-05 Published:2016-12-05

摘要/Abstract

摘要： 该文提出了一种基于实际翻转角成像（Actual Flip-angle Imaging，AFI）的快速发射场测量方法（Fast AFI，FAFI），将多次激发平面回波成像（Multi-shot Echo Planar Imaging，Multi-shot EPI）的采集方式运用于AFI发射场（B₁⁺）测量中，充分利用AFI序列中采集的等待时间，高倍数加速了水模和人体头部、腹部及盆腔的发射场测量．该文在水模和人体（n=16）实验中，验证了采用FAFI序列得到的B₁⁺测量结果与AFI结果的一致性．FAFI序列大幅加速了发射场测量，为实现动态B₁⁺匀场（B₁⁺ shimming）和快速局部激发提供了高效的发射场测量方法．

关键词: 发射场图, 平面回波成像(EPI), 动态匀场, 实际翻转角成像(AFI), 磁共振成像(MRI)

Abstract: We propose a fast B₁⁺ mapping method (FAFI) based on actual flip-angle imaging (AFI), in which the single-echo gradient echo (GRE) acquisition in the conventional AFI sequence is replaced by a multi-shot echo planar imaging (Multi-shot EPI) acquisition. FAFI makes full use of the waiting time, and thus has greatly increased imaging speed. We evaluated the performance of FAFI on phantoms and human subjects (n=16), and compared the results with those obtained using the conventional AFI method. It was demonstrated that it was possible to achieve high acceleration factor with FAFI, while preserving good consistency with the conventional AFI results. FAFI provides a powerful tool for dynamic B₁⁺ mapping, and may find applications in dynamic B₁⁺ shimming and rapid spatially selective radio frequency (RF) excitation.

Key words: B₁⁺ mapping, actual flip-angle imaging(AFI), dynamic B₁⁺ shimming, MRI, echo planar imaging(EPI)

中图分类号:

O482.53

周子堃, 胡凌志, 蒋瑞瑞, 贺强, 张卫国, 陈群. 基于AFI的快速发射场B₁⁺成像方法[J]. 波谱学杂志, 2016, 33(4): 515-527.

ZHOU Zi-kun, HU Ling-zhi, JIANG Rui-rui, HE Qiang, ZHANG Wei-guo, CHEN Qun. Rapid B₁⁺ Mapping Based on Actual Flip-Angle Imaging[J]. Chinese Journal of Magnetic Resonance, 2016, 33(4): 515-527.

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基于AFI的快速发射场B₁⁺成像方法

Rapid B₁⁺ Mapping Based on Actual Flip-Angle Imaging

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