TY - CHAP M1 - Book, Section TI - ULTRASOUND: BASICS A1 - SEYED MAHDI, ABTAHI A1 - HEDGIRE, SANDEEP A1 - BORCZUK, RACHEL A1 - ELMI, AZADEH A1 - HARISINGHANI, MUKESH A2 - Butler, Kathryn L. A2 - Harisinghani, Mukesh PY - 2015 T2 - Acute Care Surgery: Imaging Essentials for Rapid Diagnosis 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. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/10 UR - accesssurgery.mhmedical.com/content.aspx?aid=1108258729 ER -