Ultrasound imaging apparatus for imaging a region of interest in a subject comprises a plurality of separate ultrasonic probes (2a-2c) each having at least one transducer (72) for transmitting and receiving ultrasonic waves and a communications unit. A control unit (1) controls the probes to coordinate their operation in sequence, and obtains ultrasonic images from the probes for generating a display of those images together in real time simultaneously. The control unit transmits control signals to at least one of the probes, and each probe receives control signals from the control unit and/or from an adjacent one of the probes. The control signals cause the probes to execute a scan sequentially in a predetermined probe sequence which is usually repeated, and the control unit generates a display by combining the image data from the probes.
