TY  - CHAP
M1  - Book, Section
TI  - Chapter 2. Ultrasound Basics
A1  - Feller-Kopman, David
A2  - Carmody, Kristin A.
A2  - Moore, Christopher L.
A2  - Feller-Kopman, David
Y1  - 2011
N1  - 
T2  - Handbook of Critical Care and Emergency Ultrasound
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).  
SN  - 
PB  - The McGraw-Hill Companies
CY  - New York, NY
Y2  - 2024/04/20
UR  - accessanesthesiology.mhmedical.com/content.aspx?aid=56300056
ER  -