The medical radiographer, or radiologic technologist, assists the physician in the use of x-rays to examine the patient for broken bones, ulcers, tumors, and diseases of various organs. The technologist adjusts x-ray equipment to the correct setting for examinations, positions the patient, makes the required number of x-rays, and develops and files the finished work. The technologist aids the physician in administering chemical mixtures to the patient so that organs and tissues are clearly visible in x-ray examinations, and may also use mobile x-ray equipment at the bedside and in surgery.