1. A computed tomography (CT) scanner system, comprising: an X-ray source; a plurality of photon-counting detectors, wherein each photon-counting detector is configured to receive X-ray photons from the X-ray source and to provide an output signal indicating a number of X-ray photons received; and a plurality of data acquisition devices, each data acquisition device including a digital processing circuit configured to obtain a digital signal corresponding to the output signal of a photon-counting detector; determine, from the obtained digital signal, a plurality of X-ray photons received by the photon-counting detector during a measurement period; determine a corresponding energy level of each of the plurality of X-ray photons; determine, based on the corresponding energy level, a corresponding weight for each of the plurality of X-ray photons; calculate a sum of the corresponding weights of the plurality of X-ray photons; and output the sum to processing circuitry; and the processing circuitry, which is configured to generate CT images based on each sum calculated and output by the plurality of data acquisition devices.