Patent ID: 6737652
Filing Date: 2004-05-18
Classification: G01T

Abstract:
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; the object and the first coded aperture mask pattern configured such that the image of the object projected through the first coded aperture mask pattern is the convolution of the coded aperture mask pattern with the object that is modulated by a cos3(&thgr;) term, where cos3(&thgr;) is not approximately equal to one; 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 coded aperture mask pattern is associated with a decoding array that is the negative of a decoding array associated with the first coded aperture mask pattern; and combining the first and second signals to obtain a reconstructed image of the object that is substantially free of near-field artifacts that would visibly corrupt the reconstructed image if the reconstructed image were obtained solely from the first signal.