1. An imaging apparatus including: an elongated body having proximal and distal ends, the elongated body including a plurality of optical fibers extending lengthwise along the elongated body, and a plurality of longitudinally spaced apart imaging portions along at least a portion of the body, an individual one of the imaging portions including: an acoustic-to-optical transducer, configured to sense acoustic energy from the region and to provide a responsive modulation of an optical signal in the optical fiber.