NOTICE: This event will be held via Blue Jeans. The link will be placed below.

Blue Jeans Link: https://bluejeans.com/628109990

Xiaoning Jiang, Ph.D.

North Carolina State University

Seminar Abstract:

Cardiovascular disease (CVD) remains the number one cause of death and the search for more effective diagnosis and treatment techniques has been of a great interest. Ultrasound present a great potential in imaging and therapy for CVD. In this talk, small aperture transducers were designed, fabricated and tested for advanced intravascular ultrasound imaging (IVUS) and effective and safe intravenous sonothrombolysis. In specific, we investigated high frequency (40-60 MHz) micromachined piezoelectric composite transducers and arrays with broad bandwidth (-6 dB fraction bandwidth ~ 80%) for intravascular ultrasound (IVUS) imaging. Dual frequency transducers and arrays (6.5 MHz/30 MHz, 3 MHz/30 MHz) were also successfully demonstrated for contrast enhanced intravascular superharmonic imaging (or acoustic angiography) toward detection of plaque vulnerability. For the case of intravascular thrombolysis, small aperture (diameter <2 mm) sub-MHz forward-looking transducers were successfully developed with peak-negative-pressure of > 1.5 MPa. Significantly enhanced thrombolysis rate was observed by using microbubbles and nanodroplets in in-vitro tests. Other transducer techniques such as optical fiber laser ultrasound transducers were also investigated for intravenous sonothrombolysis. These new findings suggest that small aperture ultrasound transducers are increasingly important in advancing intravascular ultrasound imaging, intravenous therapy, minimal invasive diagnosis and therapy, and image guided drug delivery and surgery.