Radiation force calculations for ultrasonic fields from rectangular weakly focusing transducers

摘要

Knowledge of the theoretical relation between acoustic radiation force and ultrasonic power isimportant for measuring the emitted power, particularly from medical ultrasonic equipment, usinga radiation force balance. A far-field method is applied to calculate the radiation force exerted byrectangular field types on a large absorbing target in a nonabsorbing fluid. This is an extension ofprevious work on fields with circular symmetry. Pistonlike, apodized, and weakly focusingtransducer behavior including diffraction effects is dealt with. If diffraction is neglected, i.e., in thegeometric or high-frequency limit, the result can be given as a closed-form expression.