RT Book, Section
A1 Feller-Kopman, David
A2 Carmody, Kristin A.
A2 Moore, Christopher L.
A2 Feller-Kopman, David
SR Print(0)
ID 56300056
T1 Chapter 2. Ultrasound Basics
T2 Handbook of Critical Care and Emergency Ultrasound
YR 2011
FD 2011
PB The McGraw-Hill Companies
PP New York, NY
SN 978-0-07-160489-5
LK accessanesthesiology.mhmedical.com/content.aspx?aid=56300056
RD 2024/04/20
AB Ultrasound  (US)  uses  the  transmission  and  reflection  of  mechanical  waves  to  generate  an  image.  US  frequency  (f)  is  the  number  of  wavelengths  per  second  and  is  measured  in  hertz  (Hz)  (Fig.  2-1).  As  humans  can  hear  sound  in  the  20–20,000  Hz  range,  US  is  defined  as  sound  with  a  frequency  >20,000  Hz,  or  20  kilohertz  (kHz).  Diagnostic  sonography  for  most  medical  applications  uses  frequencies  of  2–20  megahertz  (MHz).