Therapeutic Ultrasound
Therapeutic Ultrasound Sound is the mechanical disturbance of an elastic medium such as air. Vibrations which travel through the air or another medium are called as sound. The frequency of hearing sound is 20Hz – 20,000Hz. Ultrasound means the above the frequency of sound or the sound waves which are produced above the 20,000 Hz. Production of Ultrasound: For a one mega Hz frequency machine vibrating source with a frequency of one million pulses/s (million cycles/s) is needed. This is achieved by using either quartz crystal or barium crystal. These crystals deformed when subjected to various potential differences (Piezoelectric effect). The basic components of Ultrasound apparatus are the following. o Source if high frequency current o Cable o Link electrodes o Barium or Quartz crystal o Metal plate Working: Source of high frequency current which is conveyed via co – axial cable to a ...
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