Recalage rigide 3D-2D par intensite pour le traitement percutane des cardiopathies congenitales

Percutaneous cardiac interventions rely mainly on the experience of the cardiologist to safely navigate inside soft tissues vessels under x-ray angiography guidance. Additional navigation guidance tool might contribute to improve reliability and safety of percutaneous procedures. The pathology involved are cyanogen congenital heart deceases. They are pediatric cardiac malformations which can be worsen by the presence of major aorta-pulmonary collateral arteries (MAPCAs) in their most complex form. The main contribution of this work is a fully automatic intensity-based 3D-2D registration method, which accurately maps a preoperative CT acquisition of a pediatric patient over x-ray angiography to provide such navigation guidance. The second contribution of this study is a semi-automatic features-based registration method which speeds up the initialization of the automatic technique. Our preliminary results are promising for an accurate and robust registration of both the aorta and MAPCAs (0:2650:647mm with 99 % success rate) from a initial displacement up to 20mm and 20° that can be obtained within a reasonable amount of time (13.7 seconds). Furthermore, our technique is able to compensate for a simulated respiratory motion of the vascular structure.