Ultrasound

Ultrasound

1. 1 MHz (4-7cm)

   • Acute
     • D/C 50% (non thermal effects)
       • 2) Cavitation
         • Formation of gas filled bubbles within the tissues& body fluids
       • 1) Acoustic Micro streaming
         • Unidirectional mvmt of fluid in an ultrasound field
   • Pulsed
   • Low freq.
   • Higher & deeper depth of penetration

2. 3 MHz (1-3cm)

   • Chronic
     • D/C 100% (thermal effect)
       • sound intensity remains the same
   • Continuous
   • High freq.
   • Sound waves penetrated ON skin