1. A method for simulating reduction of acquisition dosage of an X-ray image, comprising: providing first X-ray image information comprising first noise, the first X-ray image information having been acquired with a first dosage setting; providing a second dosage setting; determining a noise difference for obtaining simulated second X-ray image information acquired with the second dosage setting, said noise difference reflecting a dose dependence of a shape of a frequency dependent footprint of noise; and applying the noise difference to the first X-ray image information for obtaining the simulated second X-ray image information comprising second noise.