Rapid B1+ Mapping Based on Actual Flip-Angle Imaging

doi:10.11938/cjmr20160401

Abstract

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)

CLC Number:

O482.53

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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Rapid B₁⁺ Mapping Based on Actual Flip-Angle Imaging

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