A detector assembly for a CT imaging system is provided. The detector assemblyincluding a scintillator block including a plurality of pixels, each pixelconfigured toreceive x-ray beams travelling in a transmission direction, a plurality ofphotodiodes, anda light guide coupled between the scintillator block and the plurality ofphotodiodes, thelight guide including a plurality of light pipes, each light pipe configuredto guide lightemitted from a pixel of the plurality of pixels into an associated photodiodeof the pluralityof photodiodes, wherein each pixel has a first cross-sectional area that issubstantiallyperpendicular to the transmission direction, wherein each photodiode has asecondcross-sectional area that is substantially perpendicular to the transmissiondirection, and whereinthe first cross-sectional area is different from the second cross-sectionalarea.
