During an arc treatment, the beam shuts off and the console shows a delivery fault before the planned monitor units are reached. The patient remains immobilized on the couch while the therapists decide how to respond. Which response correctly handles and documents this equipment malfunction?

A delivery fault interrupts treatment before the planned monitor units are reached. First assess the patient's condition and follow the department's equipment-malfunction procedure. Record the monitor units delivered, the time, and the error code, and notify the physicist before resuming treatment. These details help the physicist assess the interruption; monitor units alone do not establish the dose delivered to the patient. Restarting merely because the console no longer reports an error skips that review. A brief daily-sheet note may not provide the required treatment-record documentation. Repeating the full arc without assessing the partial delivery could result in an unintended additional dose. Follow the department's procedure for patient positioning and any decision to resume treatment.