The precision of 3D reconstruction for the catheter plays an very important role in the process of image fusion between the single-plane coronary angiogram images and intravascular ultrasound images for the segment of interested vessel of coronary artery.Six pairs of matched points along the reconstructed catheter equidistantly were selected.Through constructing energy function

the matched points in the process of figuring out the minimum value of the energy function by dynamic programming were optimized.The 3D reconstruction of the catheter by single-plane coronary angiogram images was achieved.The statistical result of error indicate that the optimization method improves the precision of 3D reconstruction for the catheter.