1. An imaging apparatus including: an elongated body having proximal and distal ends, the body including at least one optical fiber; an optical-to-acoustic transducer, near the distal end of the body, configured to generate acoustic energy for imaging a region near the distal end of the body in response to a first optical signal in the optical fiber; an acoustic-to-optical transducer near the distal end of the body, configured to sense acoustic energy from the region near the distal end of the body and to provide a responsive second optical signal in the optical fiber; and a user interface, including a display configured to provide an image of the region near the distal end of the body using the second optical signal.