Passive twin-layer spatial-temporal phase-interference compensator for improved ultrasound propagation: A computer-simulation and experimental study in acrylic step-wedge samples

摘要

Transcranial ultrasound wave degradation created by variations in both thickness and tissue composition is a significant impediment to diagnostic and therapeutic interventions of the brain. The current 'active' solution is to vary the transmission delay of ultrasound pulses, inherently necessitating electronic control of each individual transducer element. This paper advances the sonic-ray concept of ultrasound wave propagation by hypothesising that wave degradation can be minimised if both the transit-time and propagation path-length for all sonic-rays are made constant.