Research Project: Characterization of Ultrasonic Intensity Output of HIFU Transducers
To circumvent the problem of sensor damage at the high intensities produced by HIFU devices, two non-invasive techniques have been developed for measuring the intensity field. In one, under a CRADA with St. Jude Medical and the University of Cincinnati, lab scientists developed a system for optical characterization of an acoustic beam via particle image velocimetry. A patent was issued for this system. The second technique comprises a method for infrared (IR) thermographic imaging of an ultrasound-induced temperature distribution on a membrane. The ultrasonic intensity field giving rise to this temperature distribution has been computed via an inverse technique.