A medical imaging assembly includes an elongated catheter having a connector at the proximal end an array of transducers on the distal end of the catheter conductors electrically coupled to the array of transducers and in electrical communication with the connector of the catheter and a control unit coupleable to the catheter to send and receive electrical signals between the control unit and the array of transducers through the connector of the catheter. The control unit has a processor to execute instructions including 1) selecting a first subset of M transmitting transducers and a second subset of N receiving transducers from the array of transducers, where N>M and 2) for each of at least N transmit/receive cycles, a) directing the first subset of M transmitting transducers to transmit an acoustic signal and b) directing the second subset of N receiving transducers to receive corresponding echo signals.
