Purpose Augmenting intraoperative cone beam computed tomography (CBCT) images with preoperative computed tomog- raphy data in the context of image-guided liver therapy is proposed. The expected beneﬁt is an improved visualization of tumor(s), vascular system and other internal structures of interest. Method An automatic elastic registration based on matching of vascular trees extracted from both the preoperative and intraoperative images is presented. Although methods dedicated to nonrigid graph matching exist, they are not efﬁcient when large intraoperative deformations of tissues occur, as is the case during the liver surgery. The contribution is an extension of the graph matching algorithm using Gaussian process regression (GPR) (Serradell et al. in IEEE Trans Pattern Anal Mach Intell 37(3):625–638, 2015): First, an improved GPR matching is introduced by imposing additional constraints during the matching when the number of hypothesis is large; like the original algorithm, this extended version does not require a manual initialization of matching. Second, a fast biomechanical model is employed to make the method capable of handling large deformations. Results The proposed automatic intraoperative augmentation is evaluated on both synthetic and real data. It is demonstrated that the algorithm is capable of handling large deformations, thus being more robust and
International Journal of Computer Assisted Radiology and Surgery – Springer Journals
Published: Apr 3, 2018
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