CT-ultrasound registration for electromagnetic navigation of cardiac intervention
Xingxin Liu, Lixu Gu, Hongzhi Xie, Shuyang Zhang · 2017
The registration of CT and ultrasound (US) can help surgeons to implement interventional surgery and diagnose the patient's condition. This research proposes a novel registration method combined with the electromagnetic navigation system for cardiac intervention. In order to obtain an initial result, a method based on the fiducial points is adapted, then a 2D slice having the maximum similarity with the US image is generated from the 3D CT model. Finally, the SURF-based algorithm is used to register the 2D slice with the US image. The innovation lies in the integration of the intensity information and feature to register preoperative CT volume model with intra-operative US image in real time. Our method is validated by phantom and clinic experiments. The phantom experiment achieved an average FRE and TRE of 0.71±0.10mm and 0.96±0.17mm.