Intravascular ultrasound techniques provide for intravascular imaging using contrast agents and nonlinear techniques. An ultrasound imaging device for detecting internal properties of a target body comprises an ultrasound transducer positioned at a distal end portion of a catheter, for transmitting excitation...http://www.google.ca/patents/US20080200815?utm_source=gb-gplus-sharePatent US20080200815 - Intravascular Ultrasound Techniques
