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. 2014 Sep 20;16(1):71. doi: 10.1186/s12968-014-0071-3

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© Wu et al.; licensee BioMed Central Ltd. 2014

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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Semi-automated AVJ tracking in cine-CMR. (A) User selects initial atrioventricluar junction (AVJ) point (highlighted in red) in cardiac phase 1 of long-axis cine-CMR series. (B) A template (red square) centered on the AVJ point in phase 1 undergoes normalized cross-correlation (NCC) with a larger region of interest (ROI) (yellow square) in phase 2. Calculation of NCC produces a correlation coefficient map, in which the maximum-intensity pixel location corresponds to new AVJ location in phase 2. (C) The new AVJ location is used as the template for the next iteration, and this process is repeated for all remaining phases in the image series.