Patent ID: 8080800

Claim:
An imaging system, comprising: a platform having mounted thereon an imaging device, the imaging device comprising: a first detector; and a second detector; a mask having a first pattern of apertures therein, the mask positioned on a first side of the first detector; an anti-mask having a second pattern of apertures therein, wherein the second pattern is derived from the first pattern, the anti-mask positioned on a first side of the second detector; and a computer configured to: acquire a plurality of mask datasets and anti-mask datasets of a gamma source; add one of the mask datasets and subtract its respective anti-mask dataset to create a far-field dataset; adjust the far-field image dataset; reconstruct a near-field image of the source using the far-field dataset; and apply an expectation maximization (EM) algorithm to one of the far-field image dataset and the near-field image to enhance contrast.