On two Unity MRI-Linac systems simultaneously installed in our institution in May 2021, we developed and implemented the acceptance and commissioning testing for the MRI component independently. We also worked together with the vendors during troubleshooting and re-testing processes. The comprehensive acceptance testing consisted of 4 phases: basic testing using vendor-provided tools, advanced testing, Linac system influence on MRI, and end-to-end testing for treatment planning and dose delivery. Both Unity machines successfully passed the MRI component acceptance testing in consideration of influence of the Linac component. MR-to-MV alignment defect on one system was fixed after major work of troubleshooting.
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