A system, comprising: at least one storage device (130, 220, 390, 1328) storing a set of instructions; and at least one processor (210, 320, 420, 1316) configured to communicate with the at least one storage device (130, 220, 390, 1328), wherein when executing the set of instructions, the at least one processor (210, 320, 420, 1316) is directed to perform operations including: determining (900,1010) an exposure state based on exposure triggering parameters; generating exposure instructions including exposure states of the imaging device, wherein the exposure states are determined by dividing an exposure process into phases, each of the phases corresponding to an exposure state; determining first components associated with the imaging device and determining target operations of the first components corresponding to the exposure states included in the exposure instructions, wherein the first components include a flat-panel detector, and the exposure states include an exposure preparation state and an exposure start state, the target operations are operations of the flat-panel detector and include a window opening operation if the determined exposure state is the exposure preparation state and include a signal acquisition operation if the determined exposure state is the exposure start state; generating target operation instructions based on the target operations of the first components; and controlling the first components to implement the target operation instructions. at least one storage device (130, 220, 390, 1328) storing a set of instructions; and at least one processor (210, 320, 420, 1316) configured to communicate with the at least one storage device (130, 220, 390, 1328), wherein when executing the set of instructions, the at least one processor (210, 320, 420, 1316) is directed to perform operations including: determining (900,1010) an exposure state based on exposure triggering parameters; generating exposure instructions including exposure states of the imaging device, wherein the exposure states are determined by dividing an exposure process into phases, each of the phases corresponding to an exposure state; determining first components associated with the imaging device and determining target operations of the first components corresponding to the exposure states included in the exposure instructions, wherein the first components include a flat-panel detector, and the exposure states include an exposure preparation state and an exposure start state, the target operations are operations of the flat-panel detector and include a window opening operation if the determined exposure state is the exposure preparation state and include a signal acquisition operation if the determined exposure state is the exposure start state; generating target operation instructions based on the target operations of the first components; and controlling the first components to implement the target operation instructions. determining (900,1010) an exposure state based on exposure triggering parameters; generating exposure instructions including exposure states of the imaging device, wherein the exposure states are determined by dividing an exposure process into phases, each of the phases corresponding to an exposure state; determining first components associated with the imaging device and determining target operations of the first components corresponding to the exposure states included in the exposure instructions, wherein the first components include a flat-panel detector, and the exposure states include an exposure preparation state and an exposure start state, the target operations are operations of the flat-panel detector and include a window opening operation if the determined exposure state is the exposure preparation state and include a signal acquisition operation if the determined exposure state is the exposure start state; generating target operation instructions based on the target operations of the first components; and controlling the first components to implement the target operation instructions.