AUTHOR=Cheng Zhen , Marriott Gerard TITLE=Editorial: Multimodality Molecular Imaging JOURNAL=Frontiers in Physics VOLUME=7 YEAR=2019 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2019.00177 DOI=10.3389/fphy.2019.00177 ISSN=2296-424X