1. A method of imaging radiation using coded apertures comprising: generating a first signal at a detector as a result of near-field radiation from an object being projected through a first coded aperture mask pattern; generating a second signal at the detector as a result of near-field radiation from the object being projected through a second coded aperture mask pattern, where the second mask pattern is associated with a decoding array that is the negative of a decoding array associated with a first pattern; and combining the first and second signals to obtain a reconstructed image of the object.