Separate CT-reconstruction for 3D wavelet based noise reduction using correlation analysis
Borsdorf A, Raupach R, Hornegger J (2007)
Publication Type: Conference contribution, Conference Contribution
Publication year: 2007
Journal
Original Authors: Borsdorf A., Raupach R., Hornegger J.
Book Volume: 4
Pages Range: 2633-2638
Event location: Honolulu, HI
Journal Issue: null
DOI: 10.1109/NSSMIC.2007.4436688
Abstract
The projection data measured in computed tomography (CT) and, consequently, the volumes reconstructed from these data contain noise. For a reliable diagnosis and subsequent image processing, like segmentation, the ratio between relevant tissue contrasts and the noise amplitude must be sufficiently large. We propose a novel 3D wavelet based method for structurepreserving noise reduction in CT. By separate reconstructions from disjoint subsets of projections, two volumes can be computed, which only differ with respect to noise. Two disjoint subsets of projections can be directly acquired using a dualsource CT-scanner. Otherwise, the two volumes can be generated by reconstructing even and odd numbered projections separately. Correlation analysis between the approximation coefficients of the two input datasets, combined with an orientation and position dependent noise estimation are used for differentiating between structure and noise at each level of the wavelet decomposition. The proposed method adapts itself to the locally varying noise power and allows an anisotropic denoising. The quantitative and qualitative evaluation on phantom and clinical data showed that noise reduction rates up to 60% can be achieved without noticeable loss of resolution. © 2007 IEEE.
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Germany (DE)How to cite
APA:
Borsdorf, A., Raupach, R., & Hornegger, J. (2007). Separate CT-reconstruction for 3D wavelet based noise reduction using correlation analysis. In Proceedings of the 2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC (pp. 2633-2638). Honolulu, HI.
MLA:
Borsdorf, Anja, Rainer Raupach, and Joachim Hornegger. "Separate CT-reconstruction for 3D wavelet based noise reduction using correlation analysis." Proceedings of the 2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC, Honolulu, HI 2007. 2633-2638.
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