Final answer:
The American Registry of Radiologic Technologists (ARRT) has the authority to impose professional sanctions on a radiographer, not ASRT, JRCERT, or TJC.
Step-by-step explanation:
The organization that has the authority to impose professional sanctions on a radiographer is the American Registry of Radiologic Technologists (ARRT). The ARRT is responsible for certifying and registering radiology professionals, which includes enforcing standards of ethics and professional conduct. Should a radiographer violate these standards, the ARRT has the power to administer sanctions ranging from censure to revocation of certification.
Other organizations mentioned, such as the American Society of Radiologic Technologists (ASRT), Joint Review Committee on Education in Radiologic Technology (JRCERT), and The Joint Commission (TJC), also have significant roles within the field of radiology, but they do not have the authority to impose professional sanctions. The ASRT provides educational and advocacy resources, the JRCERT accredits educational programs, and TJC focuses on accreditation of healthcare organizations.