Towards Clinical Application of a Laplace Operator-based Region of Interest Reconstruction Algorithm in C-arm CT
Author(s): Xia Y, Hofmann H, Dennerlein F, Müller K, Schwemmer C, Bauer S, Chintalapani G, Chinnadurai P, Hornegger J, Maier A
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Publication year: 2014
Journal issue: 3
Pages range: 593-606
It is known that a reduction of the field-of-view in 3-D X-ray imaging is proportional to a reduction in radiation dose. The resulting truncation, however, is incompatible with conventional reconstruction algorithms. Recently, a novel method for region of interest reconstruction that uses neither prior knowledge nor extrapolation has been published, named approximated truncation robust algorithm for computed tomography (ATRACT). It is based on a decomposition of the standard ramp filter into a 2-D Laplace filtering and a 2-D Radon-based residual filtering step. In this paper, we present two variants of the original ATRACT. One is based on expressing the residual filter as an efficient 2-D convolution with an analytically derived kernel. The second variant is to apply ATRACT in 1-D to further reduce computational complexity. The proposed algorithms were evaluated by using a reconstruction benchmark, as well as two clinical data sets. The results are encouraging since the proposed algorithms achieve a speed-up factor of up to 245 compared to the 2-D Radon-based ATRACT. Reconstructions of high accuracy are obtained, e.g., even real-data reconstruction in the presence of severe truncation achieve a relative root mean square error of as little as 0.92% with respect to nontruncated data. © 1982-2012 IEEE.
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APA: Xia, Y., Hofmann, H., Dennerlein, F., Müller, K., Schwemmer, C., Bauer, S.,... Maier, A. (2014). Towards Clinical Application of a Laplace Operator-based Region of Interest Reconstruction Algorithm in C-arm CT. IEEE Transactions on Medical Imaging, 33/2014(3), 593-606. https://dx.doi.org/10.1109/TMI.2013.2291622
MLA: Xia, Yan, et al. "Towards Clinical Application of a Laplace Operator-based Region of Interest Reconstruction Algorithm in C-arm CT." IEEE Transactions on Medical Imaging 33/2014.3 (2014): 593-606.