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. 2017 Jun 2;16(6):935–943. doi: 10.1177/1533034617711353

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© The Author(s) 2017

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. — A, Treatment planning computed tomography (CT) for patient 1 with the esophagus contours from daily cone beam CT (CBCTs) seen in B-F superimposed. Planning target volume (PTV) is outlined in red. The planned overlap between PTV and esophagus volumes was 0.34 cm³. Shifts in relationship between the esophagus and tumor were measured. B, CBCT #1 with esophagus contoured in yellow. Overlap between PTV and esophagus volume was 1.00 cm³. C, CBCT #2 with esophagus contoured in blue. Overlap between PTV and esophagus volume was 1.28 cm³. D, CBCT #3 with esophagus contoured in green. Overlap between PTV and esophagus volume was 1.55 cm³. E, CBCT #4 with esophagus contoured in cyan. Overlap between PTV and esophagus volume was 0.85 cm³. F, CBCT #5 with esophagus contoured in magenta. Overlap between PTV and esophagus volume was 1.24 cm³.