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A computer program based on the steady-state bi0-heat transfer equation and an ideal ultrasound power deposition is used to investigate the window size and input power level for heating a region around the focal zone (used to represent the tumor size). The distribution of temperature is used to determine the suitability of the window size and the input power level for a given set of tumor conditions. The results show that the window size is a very critical factor for effectively heating the tumors.
In another way, a pseudo-inverse method for computing array element amplitude and phase distributions using ultrasonic phased arrays is shown to be capable of producing desired field levels at a set of control points in the treatment voluine. The complex pressure at any of these control points can be chosen to produce the desired power deposition at that point, including reducing the field level to avoid potential hot spots, thus providing a powerful tool for hyperthermia treatment planning.
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