Final answer:
The radiologic or MRI technologist is responsible for the safe execution of an MRI procedure.
Step-by-step explanation:
The primary responsibility for the safe execution of an MRI procedure lies with the radiologic technologist or MRI technologist. These professionals are specially trained in operating the MRI machine and ensuring the safety of the patient throughout the procedure. They follow strict protocols to minimize the risk of negative outcomes and maintain the functionality of the equipment.