An ultrasound phased array is a tool for improved control of the power deposition and reducing the treatment time. However, controlling the position and shape of the focal zone is difficult in heterogeneous tissues due to un-modeled phased aberrations, resulting in positioning inaccuracies and increases in near field heating. This research introduces a new technique to reduce the degradation of the phased array power deposition by using system identification methods to determine a model that predicts the temperature response in heterogeneous tissue given the phased array excitation. The model, in low-order state-space form, can then be used for on-line control and prediction.
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