A new algorithm for distortion correction based on pixel-movement model(PMM)in angiography system is proposed.The parameters of PMM are derived by analyzing the pixel movement induced by the distortion(calculated by a single-image distortion correction method)in a series of phantom images acquired by a certain interval of orientation angle.The model allows distortion correction of angiographic images acquired in any arbitrary C-arm orientation.Experimental results demonstrate that the proposed algorithm is fast with high accuracy for distortion correction of angiography images.