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. 2014 Jun 19;16(1):43. doi: 10.1186/1532-429X-16-43

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Copyright © 2014 Groarke et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), 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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Qualitative analysis of image quality. A- Image quality grade 1: pulmonary veins not visualized; B- Grade 2: pulmonary veins poorly defined with significant blurring of vessels; C- Grade 3: pulmonary veins well defined with mild blurring of vessels; D- Grade 4: excellent pulmonary vein definition without blurring.