1. An imaging system, comprising: an ultrasound catheter including a tubular body, comprising: a localizer sensor adapted and configured to generate positional information for the ultrasound catheter; and an imaging ultrasound sensor positionable relative to the tubular body so as to have a first restricted field of view; and a controller coupled to the ultrasound catheter for co-registering images from the imaging ultrasound sensor with positional information from the localizer sensor, wherein the first restricted field of view spans less than 360 degrees about the tubular body.