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. 2014 Dec 23;1(1):e000141. doi: 10.1136/openhrt-2014-000141

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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The effect of rotation from a primary LAO or RAO angle on PSD for female patients: (A) primary 30° LAO projection; (B) primary 30° RAO projection and (C) primary 60° LAO projection. Results of CRA/CAU rotation from an initial 30° or 60° LAO projection were nearly identical to CRA/CAU rotation from a PA projection and are not shown. Vertical bold lines indicating the AAO. The results for each format group representing the X-ray field format and size from the group that required the largest AAO (AAO, angle to avoid overlap; PSD, peak skin dose; CAU, caudal; CRA, cranial; LAO, left anterior oblique; RAO, right anterior oblique).