Abstract: Methods, devices, systems, and apparatus for controlling pulse pileup are provided. In one aspect, a method of controlling pulse pileup includes: obtaining scan protocol parameters of a computed tomography (CT) device, the scan protocol parameters including an exposure voltage, an exposure duration for each revolution of a scanning of an object, and a number of views for each revolution, determining an angle of a radioactive source for an i-th view based on the number of views and an initial position of the radioactive source, obtaining an optimal exposure current for the i-th view under the exposure voltage by minimizing an output value of an objective function for the i-th view, and determining a current view based on the exposure duration for each revolution and a current exposure moment to perform the scanning on the object with the optimal exposure current for the current view.