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The International Journal of Cardiovascular Imaging

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Open Access 01-02-2011 | Original Paper

Fusion of 3D QCA and IVUS/OCT

Authors: Shengxian Tu, Niels R. Holm, Gerhard Koning, Zheng Huang, Johan H. C. Reiber

Published in: The International Journal of Cardiovascular Imaging | Issue 2/2011

Abstract

The combination/fusion of quantitative coronary angiography (QCA) and intravascular ultrasound (IVUS)/optical coherence tomography (OCT) depends to a great extend on the co-registration of X-ray angiography (XA) and IVUS/OCT. In this work a new and robust three-dimensional (3D) segmentation and registration approach is presented and validated. The approach starts with standard QCA of the vessel of interest in the two angiographic views (either biplane or two monoplane views). Next, the vessel of interest is reconstructed in 3D and registered with the corresponding IVUS/OCT pullback series by a distance mapping algorithm. The accuracy of the registration was retrospectively evaluated on 12 silicone phantoms with coronary stents implanted, and on 24 patients who underwent both coronary angiography and IVUS examinations of the left anterior descending artery. Stent borders or sidebranches were used as markers for the validation. While the most proximal marker was set as the baseline position for the distance mapping algorithm, the subsequent markers were used to evaluate the registration error. The correlation between the registration error and the distance from the evaluated marker to the baseline position was analyzed. The XA-IVUS registration error for the 12 phantoms was 0.03 ± 0.32 mm (P = 0.75). One OCT pullback series was excluded from the phantom study, since it did not cover the distal stent border. The XA-OCT registration error for the remaining 11 phantoms was 0.05 ± 0.25 mm (P = 0.49). For the in vivo validation, two patients were excluded due to insufficient image quality for the analysis. In total 78 sidebranches were identified from the remaining 22 patients and the registration error was evaluated on 56 markers. The registration error was 0.03 ± 0.45 mm (P = 0.67). The error was not correlated to the distance between the evaluated marker and the baseline position (P = 0.73). In conclusion, the new XA-IVUS/OCT co-registration approach is a straightforward and reliable solution to combine X-ray angiography and IVUS/OCT imaging for the assessment of the extent of coronary artery disease. It provides the interventional cardiologist with detailed information about vessel size and plaque size at every position along the vessel of interest, making this a suitable tool during the actual intervention.

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Title: Fusion of 3D QCA and IVUS/OCT
Authors: Shengxian Tu
Niels R. Holm
Gerhard Koning
Zheng Huang
Johan H. C. Reiber
Publication date: 01-02-2011
Publisher: Springer Netherlands
Published in: The International Journal of Cardiovascular Imaging / Issue 2/2011
Print ISSN: 1569-5794
Electronic ISSN: 1875-8312
DOI: https://doi.org/10.1007/s10554-011-9809-2

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