SHAPE RECOVERY AND VOLUME CALCULATION FROM BIPLANE ANGIOGRAPHY IN THESTEREOTAXIC RADIOSURGICAL TREATMENT OF ARTERIOVENOUS-MALFORMATIONS

Purpose: A model for calculating the three-dimensional volume of arter iovenous malformations from biplane angiography. Methods and Material: Three-dimensional (3D) volume reconstruction is easily feasible with axial, coronal, or sagittal computer tomography (CT) and nuclear magne tic resonance (NMR) scans, On the other hand, radiosurgical treatment of arteriovenous malformations (AVM) is exclusively based on two ortho gonal stereotactic projections, obtained with angiographic procedures, Most commonly, AVM volumes have been calculated by assimilating the n idus volume to a prolate ellipsoid, We present an algorithm dedicated to 3D structure reconstruction starting from two orthogonal stereotact ic projections, This has been achieved using a heuristic approach, whi ch has been widely adopted in the artificial intelligence domain. Resu lts: Tests on phantom of different complexity have shown excellent res ults. Conclusion: The importance of the algorithm is considerable, As a matter of fact: (a) it allows calculations of complex structures far away from regular ellipsoid; (b) it permits shape recovery; (c) it pr ovides AVM visualization on axial planes.