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. 2018 May 30;48(1):0300060518764220. doi: 10.1177/0300060518764220

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© The Author(s) 2018

Creative Commons Non Commercial CC BY-NC: 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 2. — Cardiovascular computed tomography images showing alternative placement of pre-scan contrast intensity measurement region of interest (ROI) in the left atrium and simultaneous measurement of the potential right to left contrast shunt. (a) Bolus track ROI in the left atrium. (b) Left atrial contrast intensity curve. (c) Patent foramen ovale indicated by discrete septum primum prominence into the left atrium. The black arrow shows a discrete flap, but no retrograde contrast shunt.