Liver tumor hyperthermia using an N/spl times/N ultrasound phased array

Focusing of ultrasonic waves to concentrate their power at different locations inside the volume of a liver tumor is investigated. The focusing process can be achieved by using an ultrasound phased array. An N/spl times/N phased array is introduced to produce the specific temperature distribution inside human liver. The pseudo-inverse field conjugation method is applied to generate focused power points to deliver heat to the treated volume.