Which statement is true regarding patient screening in an MRI department?

In an MRI department, the statement about Zone 3 requiring a keypad or badge system for security is accurate. Zone 3 is considered a controlled area directly adjacent to the magnet room and is where patients and personnel are screened before entering Zone 4, the magnet room itself. Implementing a keypad or badge system in Zone 3 helps to prevent unauthorized access, ensuring that only individuals who have been properly screened and are cleared for entry can access the magnet area. This security measure is vital for maintaining safety protocols around the powerful magnetic fields and radiofrequency energy present in the MRI environment.

The other choices don't accurately reflect MRI safety protocols. For example, patients are typically screened multiple times during their visit to ensure ongoing safety and to account for any changes in their condition. In addition, while MR screening forms are important, generally only one comprehensive form is utilized for the screening, which may be followed by verbal questioning. Zone 4, as the actual MRI room, is focused on the operation of the MRI machine and does not primarily deal with screening threats; it is primarily for scanning patients who have already been cleared for entry.