New medical diagnostic and therapeutic applications of ultrasound require sonication with significantly different wavelengths. Unfortunately, conventional ultrasound transducers (cf. imaging of foetuses) have a bandwidth limitation of 100%, which often is too low.
In his Ph.D, Kenneth K. Andersen worked on the design and optimisation methods of ultrasound transducers with the objective to expand the bandwidth limitation of conventional transducers. Andersen collaborated with a Norwegian biotech company, Phoenix Solutions, and designed a transducer for their application. The transducer is used to increase the efficacy of chemotherapeutic drugs using a combination of microbubbles and ultrasound. The transducer and corresponding measurement set-up is currently in use at several national and international research facilities.