Three-dimensional Reconstruction Study And Implementation Based On Intravascular Ultrasound Imaging

Contrast coronary angiography and Intravascular Ultrasound imaging arecomplementary imaging techniques, and have been widely used in vascular diseasesdiagnosis. Intravascular ultrasound imaging method can display the internal informationof blood vessel, such as the morphology, distribution and plaque type, luminalinformation. X-ray coronary angiography display vascular spatial geometry informationand the vascular lesion can be observed by external morphology of vascular. The fusionof the two imaging modalities combines their merits and overcomes some well-knownlimitations in the assessment of coronary artery diseases, the reconstructed3D vesselmodel can not only display the spatial geometry of blood vessels, but also shows theinternal information of interest part of vessels.IVUS image sequences used in previous studies are mainly acquired withmechanical rotating probe, so the fusion process in previous study is complex. Lumenand media-adventitia borders segmentation used in previous study is not ideal. Thispaper mainly studied on the fusion of electronic phased array system obtained IVUSimage sequence and CAG image, and improved borders segmentation method.This study includes three main parts: lumen and media-adventitia borderssegmentation of intravascular ultrasound, the extraction of coronary angiography,2Dimage information and three-dimensional reconstruction of vascular centerline. Finally,the fusion of IVUS and CAG also means3D reconstruction of coronary arteries. IVUSimages have a very strong background blood noise, makes it difficult to segment IVUSimage borders. Preprocessing of IVUS images is indispensible. In this paper, bilateralfiltering after Retinex enhancement algorithm was introduced to preprocessing theIVUS images then followed by the use of improved GVF (Gradient Vector Flow) Snakemodeling complete segmentation. There is no guide wire artifacts in the IVUS imageused in this paper, so only use vessel centerline as the vessel trajectory, and insert IVUSimages to the3D vessel centerline with the best angle, then smooth the surface of thereconstructed vessels. The reconstructed3D coronary arteries model can display the external morphology and vascular lumen internal plague information, and helpful inclinical.