3D reconstruction of blood vessels by data fusion from angiographic and echographic images

摘要

Three-dimensional reconstruction of vascular lesions is of great medical interestudfor diagnosis and prognosis of the atheromateous disease, as well as for audbetter understanding of restenosis phenomena related to the revascularisationudtechniques. In order to provide a quantitative description of the geometry ofudcomplex atheromateous lesions, we propose an original approach for 3D vesseludsurface reconstruction, which relies on fusion of data obtained with both digitaludangiography and intravascular echography. This method is based on a first stepudconsisting of a geometrical modelization of acquisitions and data, which yields audfirst rough reconstruction by geometrical fusion of the parameters extracted fromudthe vessel contours obtained from both modalities which provides, by interpolationudof echographic contours, the 3D surface of the vessel lumen . The next stepudconsists in taking into account the imprecision on the parameters estimatedudduring the first step. For this task, we propose an original method based on audmodelization of parameters as fuzzy numbers which allows to introduce, throughudfuzzy mathematical morphology, the imprecision on the acquisitions and on the 3Duddata. This provides a 3D reconstruction which takes into account all data aboutudthe problem . The first results prove clearly the feasibility of the method and theudinterest of using information issued from different modalities for improving theud3D reconstruction of blood vessels, without any a priori mathematical model ofudvessel morphology. The explicite introduction of imprecisions in the fusion processudallows to eliminate ambiguities and contradictions we would obtain in a simpleudreconstruction from only one modality, and leads to a decision about the trueudmorphology of vessels.