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. 2015 Jun 17;21:9. doi: 10.1186/s40885-015-0015-8

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© Lee and Park. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Two-dimensional calculations for volume calculations using biplane methods of disks (modified Simpson’s method) in apical 4 chamber (A and B) and apical 2 chamber views (C and D). Ejection fraction can be measured from the division of the stroke volume (subtraction of end-systolic volume from end-diastolic volume) by end-diastolic volume.