Dual-Frequency Impedance Matching of Catheter-Based Ultrasound Transducers for Thermal Ablation

Catheter-based ultrasound (CBUS) thermal ablation has emerged as a promising and minimally invasive technique for treating tumors. Dual-frequency CBUS thermal ablation can further enhance treatment safety and efficacy. However, current CBUS applicators are limited in size and typically use miniaturized power transducers with a single narrow frequency band, which makes it difficult to transmit dual-frequency ultrasound. In this paper, we propose a method of dual-frequency impedance matching network to ensure equipment safety and optimize the energy transmission of the power transducer at both the fundamental frequency and third harmonic frequency, so that the CBUS applicators can work at two frequencies concurrently. The proposed method provides a simplified approach for the implementation of a dual-frequency CBUS thermal ablation system.