An ultrasound imaging system, comprising: an electromagnetic field generator configured to generate an EM locator field; an interventional medical device defined by an elongate body having a distal tip and a distal end portion extending proximally from the distal tip, and having a first tracking element mounted in the distal end portion of the interventional medical device, the first tracking element being configured to generate tip location data based on the EM locator field; an ultrasound probe having a probe housing, an ultrasound transducer mechanism, and a second tracking element, the probe housing having a handle portion and a head portion, the ultrasound transducer mechanism and the second tracking element being mounted to the probe housing, the ultrasound transducer mechanism having an active ultrasound transducer array configured to generate two-dimensional ultrasound slice data at any of a plurality of discrete imaging locations within a three-dimensional imaging volume associated with the head portion, the second tracking element being configured to generate probe location data based on the EM locator field; a display screen configured to display an ultrasound image within a virtual 3D environment that allows the location and orientation of the ultrasound image to be described to the user; and a processor circuit communicatively coupled to the first tracking element, the second tracking element, the ultrasound transducer mechanism, and the display screen, the processor circuit configured to execute program instructions to process the two-dimensional ultrasound slice data to generate the ultrasound image for display at the display screen, and characterized in that the processor circuit is configured to generate a positioning signal based on the tip location data and the probe location data to dynamically position the active ultrasound transducer array at a desired imaging location of the plurality of discrete imaging locations such that the two-dimensional ultrasound slice data includes at least the distal tip of the interventional medical device so long as a location of the distal tip of the interventional medical device remains in the three-dimensional imaging volume. an electromagnetic field generator configured to generate an EM locator field; an interventional medical device defined by an elongate body having a distal tip and a distal end portion extending proximally from the distal tip, and having a first tracking element mounted in the distal end portion of the interventional medical device, the first tracking element being configured to generate tip location data based on the EM locator field; an ultrasound probe having a probe housing, an ultrasound transducer mechanism, and a second tracking element, the probe housing having a handle portion and a head portion, the ultrasound transducer mechanism and the second tracking element being mounted to the probe housing, the ultrasound transducer mechanism having an active ultrasound transducer array configured to generate two-dimensional ultrasound slice data at any of a plurality of discrete imaging locations within a three-dimensional imaging volume associated with the head portion, the second tracking element being configured to generate probe location data based on the EM locator field; a display screen configured to display an ultrasound image within a virtual 3D environment that allows the location and orientation of the ultrasound image to be described to the user; and a processor circuit communicatively coupled to the first tracking element, the second tracking element, the ultrasound transducer mechanism, and the display screen, the processor circuit configured to execute program instructions to process the two-dimensional ultrasound slice data to generate the ultrasound image for display at the display screen, and characterized in that the processor circuit is configured to generate a positioning signal based on the tip location data and the probe location data to dynamically position the active ultrasound transducer array at a desired imaging location of the plurality of discrete imaging locations such that the two-dimensional ultrasound slice data includes at least the distal tip of the interventional medical device so long as a location of the distal tip of the interventional medical device remains in the three-dimensional imaging volume.