AUTHOR=Bassiri Nema , Bayouth John , Chuong Michael D. , Kotecha Rupesh , Weiss Yonatan , Mehta Minesh P. , Gutierrez Alonso N. , Mittauer Kathryn E. TITLE=Quality assurance of an established online adaptive radiotherapy program: patch and software upgrade JOURNAL=Frontiers in Oncology VOLUME=Volume 14 - 2024 YEAR=2024 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2024.1358487 DOI=10.3389/fonc.2024.1358487 ISSN=2234-943X ABSTRACT=densities demonstrated comparable agreement between TPS and TDS. ( 7) ART absolute and predicted measured doses was within 1% of calculated TDS.Discussion: An online ART QA program for post-software upgrade has been developed and implemented on an MR Linac system. Testing mechanics and their respective baselines may vary across institutions, but all necessary components for a post-software upgrade QA have been outlined and detailed. These outlined tests were demonstrated feasible for a low-field MR Linac system; however, the scope of this work may be applied and adapted more broadly to other online ART platforms.