Research And Implementation Of Virtual Stenting System For Coronary Artery

Percutaneous transluminal coronary angioplasty (PTCA) is a widely usedintervention therapy for treatment of coronary artery diseases. The determination ofthe stent size and location within the vascular lumen is critical for the operation ofPTCA.Virtual stenting is evolved by the virtual endoscopic techniques. Currently, themain use of virtual endoscopic technique in coronary arteries is using the volumedataset of MRCA (magnetic resonance coronary angiography) or CTA. However,such noninvasive method has not become a routine mean of diagnosis of coronaryartery diseases. Interventional cardiac catheterization, such as X-ray coronaryangiography (CAG) and intravascular ultrasound (IVUS) remains the primarydiagnosis tools for heart diseases.In this dissertation, an interactive virtual stenting system for coronary arterieswas developed with virtual reality modeling language (VRML) based on the3-Dreconstruction of coronary vessels from CAG and IVUS images. A virtual stentlibrary was first created,containing various types of stents current commerciallyavailable as many as possible. Then, the viewing, selection and deployment of theappropriate stent were simulated. According to the reconstructed arterythree-dimensional model and the result of the morphological parameters such aslength and diameter, viewing and selecting the approriate virtual bracket from thelibrary; Simulating stenting procedure: the entire stents move along the centerline ofthe blood vessel lesion,and then release it to support the disease vessel. Also, underthe endoscope mode, the adherence between the stent and vessel wall was judged todetermine the appropriate location of the stent. Finally, the interaction between thestent and vessel wall was numerically simulated with the ANSYS finite elementanalysis software. After the stent implantation, the shape of the vascular structure isbound to be affected by blood flow and vascular lumen, threrby deformation occurs,the forces of various parts of the bracket will change, so dynamic analysis of thebracket to its structure,materia nature of optimization.