Methods and systems for assembling an X-ray imaging system are provided. The method for assembling an X-ray imaging system includes fabricating a rail that includes an arcuate member. The arcuate member includes a plurality of substantially planar facets that are circumferentially spaced about an outer periphery of the rail. The method further includes coupling a sensor array to at least one of the plurality of facets such that at least a portion of a substantially planar face of the sensor array mates in thermally conductive engagement with the facet.