Combining Transversal and Longitudinal Registration in IVUS Studies
Intravascular ultrasound (IVUS) is a widely used imaging technique for atherosclerotic plaque assessment, interventionist guidance, stent deploy visualization and, lately, as tissue characterization tool. Some IVUS applications solve the problem of transd
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Laborat´ orio Nacional de Computa¸c˜ ao Cient´ıfica, LNCC-MCTI, Av. Get´ ulio Vargas 333, 25651-075 Petr´ opolis, Brazil Instituto Nacional de Ciˆencia e Tecnologia em Medicina Assistida por Computa¸c˜ ao Cient´ıfica, INCT-MACC, Petr´ opolis, Brazil Comisi´ on Nacional de Investigaciones Cient´ıficas y T´ecnicas, Pladema - CONICET, UNICEN, Tandil, Argentina 4 Instituto do Cora¸c˜ ao (InCor), S˜ ao Paulo, SP, 05403-904, Brazil Universidad de S˜ ao Paulo, Faculdade de Medicina, S˜ ao Paulo, SP, 05403-904, Brazil
Abstract. Intravascular ultrasound (IVUS) is a widely used imaging technique for atherosclerotic plaque assessment, interventionist guidance, stent deploy visualization and, lately, as tissue characterization tool. Some IVUS applications solve the problem of transducer motion by gating a particular phase of the study while others, such as elastography or spatio-temporal vessel reconstruction, combine image data from different cardiac phases, for which the gating solution is not enough. In the latter, it is mandatory for the structures in different cardiac phases to be aligned (cross-sectional registration) and in the correct position along the vessel axis (longitudinal registration). In this paper, a novel method for transversal and longitudinal registration is presented, which minimizes the correlation of the structures between images in a local set of frames. To assess the performance of this method, frames immediately after carina bifurcation were marked at different cardiac phases and the error between registrations was measured. The results shown a longitudinal registration error of 0.3827 ± 0.8250 frames. Keywords: IVUS, transversal registration, longitudinal registration, cardiac phases.
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Introduction
Intravascular ultrasound (IVUS) is an imaging technique widely used for atherosclerotic plaque assessment. During its acquisition, the heart contraction imprints a motion pattern on the transducer and the vessel (referred to as cardiac dynamic component), misleading the identification of frame spatial location at non-diastolic phases. The transducer motion can be decomposed in two spatial components, the transversal motion and the longitudinal motion. The former produces a translation and rotation of the structures from one image to the c Springer International Publishing Switzerland 2015 N. Navab et al. (Eds.): MICCAI 2015, Part II, LNCS 9350, pp. 346–353, 2015. DOI: 10.1007/978-3-319-24571-3_42
Combining Transversal and Longitudinal Registration in IVUS Studies
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next, while the latter produces a proximal/distal displacement additional to the pullback [3,4]. The transversal motion component has been widely treated by rigid [13,8,14,9,6,16,15,5] and non-rigid [2,7] registration approaches. In contrast, the longitudinal motion component is usually neglected even though [3] reported an average axial displacement of 1.5 ± 0.8 mm in 0.016 mm interframe acquisitions. Due to the catheter migration, the transversal region observed in systolic phases is much more proximal than expected (mean offset of 93.
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