研究方向

Dr. Keith Johnston's PhD thesis was entitled 'The cavitation subharmonic signal: mechanistic source and optimised detection'. During his research degree, Keith developed, unique, bespoke experimental setups, which included using high-speed cameras and laser nucleation methods to study cavitation. Keith’s current research interests are focused on medical ultrasound, specifically in relation to understanding and controlling acoustic cavitation for therapeutic purposes in High Intensity Focused Ultrasound. This requires the design, fabrication of piezoelectric transducers, hydrophones for passive acoustic cavitation detection and acoustic cavitation nucleation devices. During Keith’s PhD, he was awarded the IEEE IUS Best student paper award, best poster prize 'Cavitation – cloud manipulation in dual frequency focused ultrasound' from the National Physics Laboratory, London and best poster prize for 'Cavitation Detector Optimisation using PZFLex'. In addition, Keith’s other research interest includes developing piezoelectric energy harvesting device for biomedical applications and ultrasonic devices to increase ion detection in mass spectrometry.