High frequency ultrasonic scanning system

Abstract

Progress towards a high resolution, high frequency, hand-held, ultrasonic scanner is reported. For acceptable image reconstruction, signal quantisation frequency must be of the order of eight times the ultrasonic centre frequency. For ultrasound with centre frequencies in excess of 20 MHz the design problems for hand held devices are formidable. To meet the demanding sampling rate criteria, an undersampling approach is presented. The associated hardware is described and preliminary results are also presented.