The value of ultrasound in medicine has been recognised only in the past four decades. It was first used as a therapeutic agent, since it can produce localised heat if applied to a specific area at a selected frequency and duration. The heating is due purely to the mechanical effects of the sound-waves. At a frequency of 800 kilohertz, the continuous ultrasonic beam will produce heat and can be focussed to have its effect within the body while not affecting the superficial structures. Tissue damage, however, can be caused and the British Council of Physical Medicine and Rehabilitation in 1952 recommended the use of no more than 800 kilohertz for 30 minutes, with an output of up to 25 watts per square centimetre for this type of ultrasonotherapy.


Flaw Detector Acoustical Society Ovarian Cyst Barium Titanate Ultrasonic Irradiation 
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Copyright information

© Bioengineering Unit, University of Strathclyde 1973

Authors and Affiliations

  • John MacVicar
    • 1
  1. 1.Department of ObstetricsQueen Mother’s HospitalGlasgowScotland

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