"In fluoroscopy however, where multiple images in ever changing geometry are acquired, manual adjustment of kVp is not feasible. Therefore, ABC systems constantly adjust both mAs and kVp 1,3. This is done according to a pre-programmed, operator-selected power curve. The power curve defines how should the mAs and kVp change to match an increasing attenuation of the imaged body part 3. Some ABC systems also adjust the filters 1."