AUTHOR=Beyer Thomas , Bailey Dale L. , Birk Udo J. , Buvat Irene , Catana Ciprian , Cheng Zhen , Fang Qiyin , Giove Federico , Kuntner Claudia , Laistler Elmar , Moscato Francesco , Nekolla Stephan G. , Rausch Ivo , Ronen Itamar , Saarakkala Simo , Thielemans Kris , van Elmpt Wouter , Moser Ewald TITLE=Medical Physics and Imaging–A Timely Perspective JOURNAL=Frontiers in Physics VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.634693 DOI=10.3389/fphy.2021.634693 ISSN=2296-424X