Ultrasonic HIFU transducer with non-magnetic conductive vias

A high intensity focused ultrasound (HIFU) transducer comprising:

• a piezoelectric array comprising a layer of piezoelectric material having a patient-facing front surface and a back surface, the front surface comprising a transmitting surface;
• a plurality of electrodes located on the front and back surfaces of the piezoelectric material for applying electrical signals to the piezoelectric array;
• and
• a nonmagnetic conductive via, extending through the layer of piezoelectric material and electrically connecting an electrode on the back surface to an electrode on the front surface of the piezoelectric array, and
• a printed circuit board coupled to provide a reference potential to a reference potential electrode on the back surface of the array.