Feasibility of using ultrasound phased arrays for MRI monitored noninvasive surgery

The concept of phased arrays can be used in noninvasive ultrasound surgery based on magnetic resonance imaging (MRI). The technique allows the focus to be moved electronically and the focal size to be increased. The arrays can provide enough power to necrose living tissues in 10 sec. The technique is based on two arrays which comprise a spherically curved concentric ring array and a spherically curved 16 square element array. The former helps to move the focus along the central axis, and the latter helps to make the focus larger.