FRESNEL LENS TOMOGRAPHIC IMAGING

Systems and methods for reconstructing a plurality of images of an object. An exemplary system includes a radiation source adapted to emit radiation at a plurality of frequencies; a lens with frequency-dependent focal length, such as a Fresnel lens, adapted to receive radiation modified by the object and to project onto a fixed image plane a frequency-dependent image of a slice of the object perpendicular to the radiation path; a sensor for capturing the frequency-dependent image of the object; and apparatus for facilitating creation and capture of a plurality of frequency-dependent images of the object at the plurality of frequencies. A system for reconstructing a tomographic image of the object further includes apparatus for assembling the plurality of frequency-dependent images to reconstruct the tomographic image. Methods and systems are described for use in the visible, audible, and THz frequency ranges and with broadband or narrowband radiation sources.