Response to the Letter to Editor

Fukuoka, Japan. Tel: +81926425821; Email: yuji1006@med.kyushu-u.ac.jp © 2018 mums.ac.ir All rights reserved. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. of the differences between values observed. RMSE is a simple mathematical measure and has been used for long time in nuclear medicine and molecular imaging technique with an identical formula (6-8). Based on these backgrounds, it is no wonder that many researchers may conceive to investigate the quantitative accuracy of images with a combination of RMSE and QIBA phantom. Although we did not recognize the article by Nakahara et al, we may be better to cite their article in our manuscript. Thank you for your understanding.