Final answer:
HL-7 (Health Level Seven International) is the standard that governs communication between the system that contains the patient's full medical information and the system that has radiology-specific data.
Step-by-step explanation:
The standard that governs communication between the system that contains the patient's full medical information and the system that has radiology-specific data is HL-7 (Health Level Seven International). HL-7 is a set of international standards for the exchange, integration, sharing, and retrieval of electronic health information. It defines a messaging framework and protocols that enable different healthcare systems to communicate with each other, allowing for the exchange of patient data, including radiology-specific data.