Lesion expansion by using dual concentric-sectored HIFU transducer with phase-shifted ultrasound

A split-focus scheme capable of simultaneously generating multiple foci can increase the necrotic region and thus results in reduced treatment time in HIFU (High-Intensity Focused Ultrasound) surgery. Because most split-focus techniques generate multiple foci in the lateral and elevational direction, the lesion expansion in the axial direction is relatively smaller than other directions. In this study, a dual concentric-sectored (DCS) HIFU transducer with phase-shifted ultrasound technique is presented to generate multiple foci in the lateral/elevational and axial direction. The performance of the proposed method was demonstrated through Field-II and bio-heat transfer/thermal dose simulations.