6 March 2013 Truncation correction for VOI C-arm CT using scattered radiation
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Proceedings Volume 8668, Medical Imaging 2013: Physics of Medical Imaging; 86682F (2013) https://doi.org/10.1117/12.2007486
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States
Abstract
In C-arm computed tomography, patient dose reduction by volume-of-interest (VOI) imaging is of increasing interest for many clinical applications. A remaining limitation of VOI imaging is the truncation artifact when reconstructing a 3D volume. It can either be cupping towards the boundaries of the field-of-view (FOV) or an incorrect offset in the Hounsfield values of the reconstructed voxels. In this paper, we present a new method for correction of truncation artifacts in a collimated scan. When axial or lateral collimation are applied, scattered radiation still reaches the detector and is recorded outside of the FOV. If the full area of the detector is read out we can use this scattered signal to estimate the truncated part of the object. We apply three processing steps: detection of the collimator edge, adjustment of the area outside the FOV, and interpolation of the collimator edge. Compared to heuristic truncation correction methods we were able to reconstruct high contrast structures like bones outside of the FOV. Inside the FOV we achieved similar reconstruction results as with water cylinder truncation correction. These preliminary results indicate that scattered radiation outside the FOV can be used to improve image quality and further research in this direction seems beneficial.
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Bastian Bier, Andreas Maier, Hannes G. Hofmann, Chris Schwemmer, Yan Xia, Tobias Struffert, Joachim Hornegger, "Truncation correction for VOI C-arm CT using scattered radiation", Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 86682F (6 March 2013); doi: 10.1117/12.2007486; https://doi.org/10.1117/12.2007486
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