Multi-channel, Stretchable, Self-Tuning Coil Array Based on Liquid Metal Technology

Stretchable receive coils can provide conformal fitting, improved SNR, and dynamic imaging capabilities. However, conductor stretching alters the resonance frequency, reducing potential SNR advantages. Previously, we proposed and demonstrated in a single element prototype a smart self-tuning coil design which allows to maintain the desired Larmor frequency with stretching. This work investigates the applicability of self-tuning techniques in a multi-channel stretchable coil array and demonstrates its performance in silico and in vitro. Simulation results show stable resonance frequency (<1%) and sensitivity (±5%) for varied load/stretching conditions. In vitro imaging demonstrates consistent performance of individual coil elements and the array (SNR=146).