MRI is always performed in what manner to ensure safety?

MRI is always performed with the equipment "On" to ensure safety because the MRI machine relies on powerful magnets and radiofrequency pulses to generate images of the body's internal structures. When the machine is operating, it is crucial for the procedure to be continuously monitored by trained personnel to ensure that safety protocols are adhered to, including patient positioning, monitoring for any foreign metallic objects, and responding to any patient needs or concerns throughout the scan.

Having the machine "Off" would prevent the necessary imaging from occurring, rendering the procedure ineffective. Operating it "Without supervision" poses significant risks to patient safety, as trained professionals are essential to manage the environment and address any emergencies or technical issues. Lastly, performing an MRI "In an emergency" does not align with standard protocol since MRIs are typically scheduled and require specific preparation; they are not used as immediate emergency imaging compared to other methods like X-rays or CT scans. Thus, having the MRI machine operating is integral to conducting the scan safely and effectively.