ARRT - American Registry of Radiologic Technologists - American Registry of Radiologic Technologists, BLS - Basic Life Support - American Heart Association, NMTCB - Nuclear Medicine Technology Certification Board - Nuclear Medicine Technology Certification Board. The position prepares patient for testing (including thorough screening questioning), assists the radiologist during testing, operates the MRI equipment for a variety of procedures, maintains supply inventory in assigned rooms, and covers call duty, as assigned.