In many current medical applications of high intensity focused ultrasound it is necessary to take into account additional energy losses due to the presence of natural obstacles like ribs. In this study the feasibility of using phased arrays with different number of elements to reduce overheating ribs when focusing through the intercostal spaces was studied. Geometric approach to switch off the array elements that are in the shadow of ribs was used to minimize the exposure of the ribs to the ultrasound energy. The effect of the number of the array elements on the value of the power losses of the focused beam at the ribs and the level of intensity in the focal region behind the ribs was studied.
Department of Acoustics, Faculty of Physics, M.V.Lomonosov Moscow State University. Moscow, 119991, Russia, Leninskie Gory str., 1, build. 2
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