Template-based CTA X-ray angio rigid registration of coronary arteries in frequency domain

Timur Aksoy; Stefanie Demirci; Muzaffer Degertekin; Nassir Navab; Gozde Unal

doi:10.1117/12.2007963

15 March 2013 Template-based CTA X-ray angio rigid registration of coronary arteries in frequency domain

Timur Aksoy, Stefanie Demirci, Muzaffer Degertekin, Nassir Navab, Gozde Unal

Proceedings Volume 8671, Medical Imaging 2013: Image-Guided Procedures, Robotic Interventions, and Modeling; 867127 (2013) https://doi.org/10.1117/12.2007963
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

This study performs 3D to 2D rigid registration of segmented pre-operative CTA coronary arteries with a single segmented intra-operative X-ray Angio frame in both frequency and spatial domains for real-time Angiography interventions by C-arm fluoroscopy. Most of the work on rigid registration in literature required a close initial- ization of poses and/or positions because of the abundance of local minima and high complexity that searching algorithms face. This study avoids such setbacks by transforming the projections into translation-invariant Fourier domain for estimating the 3D pose. First, template DRRs as candidate poses of 3D vessels of segmented CTA are produced by rotating the camera (image intensifier) around the DICOM angle values with a wide range as in C-arm setup. We have compared the 3D poses of template DRRs with the real X-ray after equalizing the scales (due to disparities in focal length distances) in 3 domains, namely Fourier magnitude, Fourier phase and Fourier polar. The best pose candidate was chosen by one of the highest similarity measures returned by the methods in these domains. It has been noted in literature that these methods are robust against noise and occlusion which was also validated by our results. Translation of the volume was then recovered by distance-map based BFGS optimization well suited to convex structure of our objective function without local minima due to distance maps. Final results were evaluated in 2D projection space rather than with actual values in 3D due to lack of ground truth, ill-posedness of the problem which we intend to address in future.

Citation Download Citation

Timur Aksoy, Stefanie Demirci, Muzaffer Degertekin, Nassir Navab, and Gozde Unal "Template-based CTA X-ray angio rigid registration of coronary arteries in frequency domain", Proc. SPIE 8671, Medical Imaging 2013: Image-Guided Procedures, Robotic Interventions, and Modeling, 867127 (15 March 2013); https://doi.org/10.1117/12.2007963

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KEYWORDS

X-rays

X-ray imaging

Arteries

Rigid registration

Image registration

Image segmentation

Cameras

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