IVUS融合冠状动脉CAG三维重建模型的角度校正研究

针对冠状动脉三维重建中IVUS采集角度偏差导致模型结果的失真,提出一种在融合过程中校正IVUS融合角度的新方法。首先,分析CAG和IVUS图像中冠状动脉血管的径向信息差异计算出IVUS帧在成像过程中超声机械探头的偏移角度。其次,应用Active Demons算法判断IVUS帧在融合三维模型中的朝向。最后,将角度校正后的IVUS图像数据融合至三维骨架模型当中,完成两种数据的融合。实验表明,本文方法能大幅度改善因IVUS角度偏差而导致的IVUS图像在三维模型中的失真情况,使冠状动脉三维重建结果更满足临床应用的需要。

Angle correction of IVUS on CAG 3D reconstruction of coronary artery

In order to solve the IVUS distortion problem caused by the catheter rotation on the 3D reconstruction of coronary artery, this paper proposed a novel method to correct the fusion angle of IVUS. The method starts with the analysis of radial informational differences between CAG and IVUS, and the angle of the catheter twist was obtained. Then, the direction between the IVUS and the cross-section of the coronary artery is analyzed by applying the Active Demons algorithm. Finally, the IVUS frames are settled in an ideal position to the three-dimensional model of the coronary artery and the fusion of two types of data is implemented. The experimental result shows that the method could sharply relief the anamorphose on account of IVUS distortion in 3D reconstruction model, and improved the accuracy of the 3D reconstruction of coronary artery.