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. 2016 Aug 13;58(5):600–608. doi: 10.1177/0284185116658682

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© The Foundation Acta Radiologica 2016

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License (http://www.creativecommons.org/licenses/by-nc/3.0/) 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 page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Fig. 1. — (a) White arrow indicates the upper left corner of the ROI. (b) The upper left corner is defined, and the arrow is being moved to the lower right corner. (c, d) ROI is now defined, and only this part of the FOV, outlined by the white-lined frame, will be exposed to irradiation; the LIH (upper left corner) will be superimposed over the collimated part of the FOV. “Spot” in each corner indicates that SF will be activated.