1 Correction to: J Med Biol Eng (2017) 37:230–239 https://doi.org/10.1007/s40846-016-0200-6

The article “Adopting Quaternion Wavelet Transform to Fuse Multi-Modal Medical Images”, written by Peng Geng, Xiuming Sun, Jianhua Liu was originally published Online First without open access. After publication in volume [37], issue [2], page [230–239] the author decided to opt for Open Choice and to make the article an open access publication. Therefore, the copyright of the article has been changed to © The Author(s) [2018] and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.