TY - CHAP M1 - Book, Section TI - Chapter 1. Scope of Diagnostic Imaging A1 - Chen, Michael Y. M. A1 - Whitlow, Christopher T. A2 - Chen, Michael Y.M. A2 - Pope, Thomas L. A2 - Ott, David J. PY - 2011 T2 - Basic Radiology, 2e AB - For almost half a century following the discovery of x-rays by Roentgen in 1895, radiologic imaging was mainly based on plain and contrast-enhanced radiography. Those images were created by exposing film to an x-ray beam attenuated after penetrating the body. The production of x-rays and radiographic images is described in the next chapter. In the recent half century, diagnostic radiology has undergone dramatic changes and developments. Conventional angiography, nuclear medicine, ultrasonography, and computed tomography (CT) were developed between 1950 and 1970. Magnetic resonance (MR) imaging, interventional radiology, and positron emission tomography (PET) were developed later. Conventional radiology, including contrast-enhanced radiography and CT, uses ionizing radiation created from x-ray equipment. Nuclear medicine uses ionizing radiation that is emitted from injected or ingested radioactive pharmaceuticals in various parts of the body. Ultrasonography and MR imaging modalities use sound waves and magnetism, respectively, rather than ionizing radiation. SN - PB - The McGraw-Hill Companies CY - New York, NY Y2 - 2024/03/29 UR - accessmedicine.mhmedical.com/content.aspx?aid=6668001 ER -