1 Correction to: J. Med. Biol. Eng. (2017) 37:944–952 https://doi.org/10.1007/s40846-017-0258-9

The article “An Acoustic Tracking Approach for Medical Ultrasound Image Simulator” written by Po-Heng Chen, Kai-Sheng Hsieh, Chih-Chung Huang was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 21 June 2017 without open access.

After publication in volume [37], issue [6], page [944–952] the authors 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.