RADIOLOGICAL TERMINOLOGY

a. Radiograph. An exposed and processed film (roentgenograph, roentgenogram). Also known as an x-ray negative.
b. Roentgenology. The study and use of x-rays (radiology).
c. Roentgen Ray. Electromagnetic radiation of pure energy and extremely short wavelength (X-ray), sometimes referred to as x-ray photons.
d. X-ray Photon. Electromagnetic rays produced by the x-ray machine. (The x-ray photon will be dealt with in greater detail in Lesson 4 of this text.)