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. 2019 Jan 8;18:1533033818823054. doi: 10.1177/1533033818823054

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© The Author(s) 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — STEEV phantom CNR based on acrylic and water contours in Full-Fan Head and Half-Fan Head results with different reconstructions, FDK_CBCT, iterative_CBCT with very low, low, medium, high, and very high noise reduction factors. CT results are displayed at the right. CBCT indicates cone-beam computed tomography; CNR, contrast to noise ratio; CT, computed tomography; FDK, Feldkamp-Davis-Kress; STEEV, stereotactic end-to-end verification.