Wireless Reconfigurable RF Detector Array for Focal and Multiregional Signal Enhancement

IEEE Access

Chunqi Qian¹  Wei Qian¹  Xin Yu² 

[1] Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI, USA;Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, USA;

关键词: Sensor arrays;    nonlinear circuits;    inductive power transmission;    magnetic resonance;   

DOI  :  10.1109/ACCESS.2020.3011905

来源: DOAJ

【 摘 要 】

Wirelessly Amplified NMR Detectors (WAND) can utilize wireless pumping power to amplify MRI signals in situ for sensitivity enhancement of deep-lying tissues that are difficult to access by conventional surface coils. To reconfigure between selective and simultaneous activation in a multielement array, each WAND has a dipole resonance mode for MR signal acquisition and two butterfly modes that support counter-rotating current circulation. Because detectors in the same row share the same lower butterfly frequency but different higher butterfly frequency, a pumping signal at the sum frequency of the dipole mode and the higher butterfly mode can selectively activate individual resonators, leading to 4-fold sensitivity gain over passive coupling. Meanwhile, a pumping signal at the sum frequency of the dipole mode and the lower butterfly mode can simultaneously activate multiple resonators in the same row, leading to 3-fold sensitivity gain over passive coupling. When multiple rows of detectors are parallelly aligned, each row has a unique lower butterfly frequency for consecutive activation during the acquisition interval of the others. This wireless detector array can be embedded beneath a headpost that is normally required for multi-modal brain imaging, enabling easy reconfiguration between focal imaging of individual vessels and multiregional mapping of brain connectivity.

【 授权许可】

Unknown