Name four imaging modalities that use EM waves to produce an image. Order the following types of energy by wavelength, shortest to longest: gamma ray, radio wave, x-ray, light What is the basic principle of radiologic imaging? What is the difference between ultrasound and x-rays? Book traversal links for Principles ‹ What term is used to describe the pixel values on MRI? Up Name four imaging modalities that use EM waves to produce an image. ›