Heating caused by selected pulsed Doppler and physiotherapy ultrasound beams measured using thermal test objects
1Medical Physics Department, Royal United Hospital, Combe Park, Bath BA1 3NG, UK. timothy.atkins@ruh-bath.swest.nhs.uk
Objective:
To assess the heating caused by selected pulsed Doppler and physiotherapy ultrasound beams by measurements made using thermal test objects.
Method:
Thermal test objects were used to measure temperature rises in selected ultrasound fields. These were compared with theoretical predictions based on standard exposure measurements. A separate thermocouple was used to measure heating at the transducer surface.
Results:
Temperature rises of up to 6 degrees C were measured for Doppler fields using a thermal test object. The attenuation-corrected temperature rises that were measured generally agreed with calculated Thermal Indices. Temperature rises of up to 2 degrees C were observed for physiotherapy ultrasound fields in pulsed operation.
Conclusion:
Significant overlap between the measured temperature rises of selected pulsed Doppler and physiotherapy ultrasound fields was observed.
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