Title :
Applications of ultrasound stimulated vibro-acoustography
Author :
Greenleaf, James F.
Author_Institution :
Dept. of Physiol. & Biophys., Mayo Clinic Coll. of Medicine, Rochester, MN, USA
Abstract :
Vibro-acoustography is a method of imaging and measurement that uses ultrasound to produce radiation force to vibrate objects. The radiation force is concentrated laterally by focusing the ultrasound beam. The radiation force is limited in depth by intersecting two beams at different frequencies so that there is interference between the beams at the difference frequency only at their intersection. This results in a radiation stress of limited spatial extent on or within the object of interest. The resulting harmonic displacement of the object is detected by its acoustic emission, with ultrasound Doppler measurement, or with a laser interferometer. The displacement is a complicated function of the object material parameters. However, significant images and measurements can be made with this arrangement. Vibro-acoustography can produce images of biologically relevant objects such as breast micro-calcification and vessel calcifications, heart valves, and normal arteries. Several examples of these results will be described.
Keywords :
Doppler measurement; acoustic emission; biomedical imaging; cardiology; light interferometers; ultrasonic imaging; acoustic emission; biologically relevant objects images; breast micro calcification; harmonic displacement; heart valves; laser interferometry; normal arteries; radiation force; ultrasound Doppler measurement; ultrasound beam; ultrasound imaging; ultrasound stimulated vibro acoustography; vessel calcifications; Acoustic beams; Focusing; Force measurement; Frequency; Interference; Laser beams; Stress; Ultrasonic imaging; Ultrasonic variables measurement; Vibration measurement;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293582