P1B-1 Optimization of Power Distributions Produced by Ultrasound Phased Arrays through Waveform Diversity

The objective of hyperthermia cancer therapy is to elevate the tumor temperature to approximately 43degC while maintaining normal temperature in healthy tissue. This goal can be achieved through a waveform diversity method that optimizes the covariance matrix of the excitation signals applied to array elements. This paper presents the computer simulation of a cylindrical section ultrasound phased array using the waveform diversity method to heat a spherical tumor embedded in a 3D biological tissue model. With this hearing strategy, optimal excitation sequences are obtained and desirable power depositions and temperature distributions are achieved.