1. An apparatus for use in generating images of a selected region of a patient's body, comprising: a radiation source for transmitting a radiation signal through a selected region of a patient's body; radiation detection means, positionable for scanning movement along a first path, for receiving a portion of said radiation signal passing through a selected region of a patient's body during said scanning movement and providing a first image signal responsive thereto; and an ultrasound transducer, positionable for scanning movement along a second path, for receiving an ultrasound signal from a selected region of a patient's body during said second movement and providing a second image signal responsive thereto, wherein said second path is one of the same and substantially coincidental to said first path.