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Ultrasonic power balances--effect of a coupling window on the power measured from physiotherapy ultrasound units
1Medical Physics Department, Dorset County Hospital, Dorchester, UK. michael.lunt@rbch-tr.swest.nhs.uk
Ultrasound in Medicine & Biology
|August 31, 2001
Abstract:
The output from physiotherapy ultrasound (US) probes is usually measured using a radiation force balance. Some balances are sealed and incorporate a membrane coupling window. The probes are highly resonant, and the output may be affected by changes in acoustic loading caused by the membrane. A model has been developed to examine this effect, and predicts that a polythene membrane 100-microm thick can change the output power by up to 17%.
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