Patent Number: 
Section: claims

1. A detector assembly including:a semiconductor detector having a first surface and a second surface opposed to each other, the first surface including pixels comprising pixelated anodes, and the second surface comprising a cathode electrode;a collimator including openings, each opening associated with a single corresponding pixel of the semiconductor detector; anda processing unit configured to identify detected events within virtual sub-pixels distributed along a length and width of the semiconductor detector, wherein each pixel comprises a plurality of corresponding virtual sub-pixels, wherein absorbed photons are counted as events in a corresponding virtual sub-pixel, wherein absorbed photons are counted as events within a thickness of the semiconductor detector at a distance corresponding to an energy window width used to identify the events as photon impacts. 2. The detector assembly of claim 1, wherein an absorption location for each absorbed photon within the thickness of the semiconductor detector is defined within a range such that ΔL/D=ΔE/E, where ΔL is a distance from the cathode, D is the detector thickness, ΔE is an energy window width, and E is a photopeak energy of an absorbed photon. 3. The detector assembly of claim 1, wherein the processing unit is configured to determine an absorption location for a given absorbed photon based on non-collected signals received from pixelated anodes adjacent to a pixelated anode absorbing the given absorbed photon. 4. The detector assembly of claim 1, wherein the collimator is a pinhole collimator. 5. The detector assembly of claim 1, wherein the collimator is a parallel-hole collimator. 6. The detector assembly of claim 1, wherein the events for each pixel are counted at a single shared location. 7. The detector assembly of claim 1, wherein the events for each pixel are counted within a single shared range. 8. The detector assembly of claim 1, wherein each pixel comprises virtual sub-pixels along the length and width, but not along the thickness of the semiconductor detector.