Preferred CRT-Radiologic Technologist Registration - ARRT American Registry of Radiologic Technologist Upon Hire requiredCRT-Computerized Tomography (CT) - ARDMS American Registry for Diagnostic Medical Sonography 1 Year requiredCRT-Basic Life Support (BLS) - AHA American Heart Association Upon Hire required OrCRT-Basic Life Support (BLS) - ARC American Red Cross Upon Hire required. Computed Tomography Technologist, CT tech, CT technologist, computed tomography tech, CT, radiology, radiologic technologist, radiologic, allied health, healthcare, health care, allied, medical, hospital, patient care, ct, computed tomography