Figure BBB.3.3.1-1 illustrates a message sequence example for the external verification model in the case where the Machine Parameter Verifier (MPV) either detects that an override is required, or requires additional information (such as a bar code) before authorizing treatment.
The steps in this use case replace Steps 8a to 9f in Use Case BBB.3.2, for the case where only a single beam is delivered.
Figure BBB.3.3.1-1. Treatment Delivery Message Sequence - Override or Additional Information Required