Combination of a multimode antenna and TIAMO for traveling-wave imaging at 9.4 Tesla

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Jens HoffmannRolf Pohmann

Abstract

To investigate the performance of a multimode antenna combined with time-interleaved acquisition of modes (TIAMO) for improved (1)H image homogeneity as compared to conventional traveling-wave imaging in the human brain at 9.4 Tesla (T). An adjustable three-port antenna was built to stimulate the propagation of three basic waveguide modes within a 9.4 T scanner bore. For TIAMO, two time-interleaved acquisitions using different linear combinations of these modes were optimized to achieve a homogeneous rooted sum-of-squares combination of their B1+ patterns ( B1,RSS+). The antenna's transmit and receive performance, as well as local specific absorption rate, were analyzed using experiments and numerical simulations. The optimized TIAMO B1,RSS+ combination was superior to radiofrequency shimming. Across the entire brain, it improved the homogeneity of the excitation field by a factor of two and its maximum-to-minimum ratio by almost a factor of five as compared to the circularly polarized mode. The two-fold increase in "virtual" receive channels enhanced the parallel imaging performance and enabled the use of higher acceleration factors. Despite the limited number of channels, a remote three-port antenna combined with TIAMO repres...Continue Reading

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Citations

Apr 4, 2017·Journal of Magnetic Resonance Imaging : JMRI·Oliver Kraff, Harald H Quick
Feb 13, 2017·Magnetic Resonance Imaging·Xinqiang YanWilliam A Grissom
Jan 8, 2021·Journal of Magnetic Resonance·F VazquezA O Rodriguez
Jan 20, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bei ZhangRiccardo Lattanzi

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