Precompensation for mutual coupling between array elements in parallel excitation

[摘要] Parallel transmission or excitation has been suggested to perform multi-dimensional spatial selective excitation to shortenthe pulse width using a coil array and the sensitivity information. The mutual coupling between array elements has been acritical technical issue in RF array designs, which can cause artifacts on the excitation profile, leading to degraded excitationperformance and image quality. In this work, a precompensation method is proposed to address the mutual coupling effectin parallel transmission by introducing the mutual coupling coefficient matrix into the RF pulses design procedure of theparallel transmission. 90° RF pulses have been designed using both the original transmit SENSE method and the proposedprecompensation method for RF arrays with non-negligible mutual coupling, and their excitation profiles are generated bysimulating the Bloch equation. The results show that the mutual coupling effect can be effectively compensated by usingthe proposed method, yielding enhanced tolerance to insufficient mutual decoupling of RF arrays in parallel excitation,ultimately, providing improved performance and accuracy of parallel excitation.

[学科分类] 外科医学