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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 5. — Comparison of CT images (upper row, A-C) and CBCT images reconstructed by FDK_CBCT (middle row, D-F), and iterative_CBCT algorithm with Medium noise reduction factor (lower row, G-I) and for a head/neck patient. HU window: [−400, 600 HU]. Artifacts (arrows on the coronal and sagittal views) are mitigated in the iterative_CBCT reconstructions. Contours of spinal cord, left and right parotid glands, and target are displayed. CBCT indicates cone-beam computed tomography; CT, computed tomography; FDK, Feldkamp-Davis-Kress.