A concentric-ring equivalent phased array method to model fields of large axisymmetric ultrasound transducers

An equivalent concentric-ring ultrasound phased array method was developed to estimate ultrasonic continuous wave fields generated by axisymmetric sin gle-source transducers, The method models a given source as a concentric-ri ng phased array by mathematically segmenting it into many rings and subsequ ently finding the amplitude and phase for each ring that produces an acoust ic field similar to the held of the single-source transducer. The excitatio n source of each ring was calculated using an inverse technique based on co mplex pressure measurements along a radial line close to the source. The pr edicting abilities of the method are evaluated by comparing measured and es timated ultrasound fields for six different transducers. The results show t hat the concentric-ring equivalent phased array method (CREPAM) is able to estimate quantitatively the ultrasound fields generated by large axisymmetr ic planar and focused transducers.