A Two-stage Angiographic Parameter Calibration Method for Coronary Artery 3D Reconstruction

Three-dimensional(3D) reconstruction technology of coronary artery allows doctors observe more intuitively thus compensating the limitations of X-ray coronary angiography. However, directly using the original parameters to reconstruct 3D vessels can lead to substantial errors due to factors such as surgical table movement, heart beating, and inaccuracies in clinical calibration. Therefore, calibration of imaging system parameters is crucial for accurate 3D coronary artery reconstruction. This paper proposes a novel method for reconstructing 3D coronary artery from two uncalibrated angiographic views. It thoroughly analyzes the projection principle of X-ray coronary angiography and performs coarse calibration using coronary tree topology constraints and epipolar constraints. Moreover, in addition to the traditional reprojection error, this method introduces vascular diameter error for fine calibration. Experimental results demonstrate that this method achieves more accurate reconstruction results in a shorter time, with a reprojection intersection over union (IoU) ratio of 0.872, thereby confirming the effectiveness of this approach.