A method of calibrating a geometry of an ultrasound transducer comprising a plurality of transducer elements , the method comprising: providing a first acoustic reflector spanning an area traversed by a plurality of beam paths of ultrasound waves transmitted from at least some of the transducer elements to a focal zone ; causing said at least some transducer elements to transmit the ultrasound waves to the focal zone ; measuring reflections of the ultrasound waves off the first acoustic reflector ; and based at least in part on the measured reflections, determining optimal geometric parameters associated with said at least some transducer elements ; the method further comprising: (a) analyzing the measured reflections to obtain a phase shift associated therewith; and computing a phase difference between the phase shift and an estimated phase value, wherein the optimal geometric parameters are determined based at least in part on the computed phase difference; or (b) computing a time of flight of the ultrasound waves from a time when the ultrasound waves are transmitted from the transducer elements to a time when the reflections are measured; or (c) modulating an ultrasound frequency of the transmitted waves; and determining the geometric parameters associated with said at least some transducer elements based at least in part on the reflections off the first acoustic reflector . providing a first acoustic reflector spanning an area traversed by a plurality of beam paths of ultrasound waves transmitted from at least some of the transducer elements to a focal zone ; causing said at least some transducer elements to transmit the ultrasound waves to the focal zone ; measuring reflections of the ultrasound waves off the first acoustic reflector ; and based at least in part on the measured reflections, determining optimal geometric parameters associated with said at least some transducer elements ; the method further comprising: (a) analyzing the measured reflections to obtain a phase shift associated therewith; and computing a phase difference between the phase shift and an estimated phase value, wherein the optimal geometric parameters are determined based at least in part on the computed phase difference; or (b) computing a time of flight of the ultrasound waves from a time when the ultrasound waves are transmitted from the transducer elements to a time when the reflections are measured; or (c) modulating an ultrasound frequency of the transmitted waves; and determining the geometric parameters associated with said at least some transducer elements based at least in part on the reflections off the first acoustic reflector . (a) analyzing the measured reflections to obtain a phase shift associated therewith; and computing a phase difference between the phase shift and an estimated phase value, wherein the optimal geometric parameters are determined based at least in part on the computed phase difference; or (b) computing a time of flight of the ultrasound waves from a time when the ultrasound waves are transmitted from the transducer elements to a time when the reflections are measured; or (c) modulating an ultrasound frequency of the transmitted waves; and determining the geometric parameters associated with said at least some transducer elements based at least in part on the reflections off the first acoustic reflector . <EOS>