Abstract: In one embodiment, a method for treating a vascular occlusion in a patient's body comprises exposing the vascular occlusion to an external ultrasonic energy field that is generated outside the patient's body. The method further comprises positioning an ultrasound radiating member in the patient's body in the vicinity of the vascular occlusion. The method further comprises exposing the vascular occlusion to an internal ultrasonic energy field that is generated by the ultrasound radiating member. The method further comprises using the ultrasound radiating member to detect a first characteristic of the external ultrasonic energy field. The method further comprises adjusting a second characteristic of the external ultrasonic energy field based on the detected first characteristic of the external ultrasonic energy field.

Abstract: A method for treating an occlusion comprises positioning a catheter at a treatment site in a patient's vasculature. A blockage is located at the treatment site. The method further comprises performing a medical treatment at the treatment site. The medical treatment is configured to reduce the blockage. The method further comprises making a plurality of measurements at the treatment site.

Abstract: An ultrasound catheter adapted for accessing small vessels in the distal anatomy is disclosed. The ultrasound catheter comprises an elongate tubular body formed with a delivery lumen. The flexibility and dimensions of the tubular body allow access to the distal anatomy by advancement over the guidewire. An ultrasound radiating member is provided along the distal end portion of the tubular body for emitting ultrasound energy at a treatment site. A drug solution may also be delivered through the delivery lumen and out an exit port to the treatment site.