A system for maintaining coherence of ultrasound waves emitted by multiple transducer arrays includes multiple retention arms, each for receiving one of the transducer arrays； a connecting frame for receiving and mechanically retaining the arms in fixed angular relation to each other； and a processor configured to determine relative locations of the transducer arrays with respect to one another and the connecting frame； determine a location of the connecting frame relative to an anatomic region of interest； determine a spatial arrangement of the transducer elements in each transducer array with respect to the anatomic region of interest； and adjust a transmission configuration of the transducer elements in the transducer arrays to achieve a desired focusing property with respect to the anatomic region of interest while maintaining coherence therebetween.
