Ultrasound is a therapeutic modality taht is applied using a round-headed wand or probe that is put in direct contact with the patient's skin. Ultrasound gel is used on all surfaces of the head in order to reduce friction and assist in the transmission of the ultrasonic waves.

Ultrasound can produce many effects other than just the potential heating effect. It has been shown to cause increases in tissue relaxation and it is very effective improving local blood flow.