RT Book, Section A1 SEYED MAHDI, ABTAHI A1 HEDGIRE, SANDEEP A1 BORCZUK, RACHEL A1 ELMI, AZADEH A1 HARISINGHANI, MUKESH A2 Butler, Kathryn L. A2 Harisinghani, Mukesh SR Print(0) ID 1108258729 T1 ULTRASOUND: BASICS T2 Acute Care Surgery: Imaging Essentials for Rapid Diagnosis YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 9780071831208 LK accesssurgery.mhmedical.com/content.aspx?aid=1108258729 RD 2024/10/09 AB Ultrasound imaging uses the pulse-echo principle in which a short burst of sound waves are emitted from a transducer and directed to the underlying tissue. Diagnostic ultrasound uses sound waves of frequencies between 2 and 20 MHz. When a sound beam is directed toward the body, tissue reflects, absorbs, or scatters the beam. Each of these responses determines the nature of the received signal. The sum of acoustic energy losses from absorption, scattering, and reflection is called attenuation.