The degree of acoustic coupling between the ultrasonic treatment applicator and the
patient is monitored by the contact sense circuit and the microcontroller. At detection of
contact loss the indicator on the selected applicator turns RED, the treatment timer
is halted and after 2 seconds of contact loss the ultrasonic output power is reduced from
that selected to 0.2 Watts/cm
2
. At detection of contact the treatment timer resumes and
the ultrasonic output power is restored to the selected value.
This ensures the patient receives the ultrasound dose selected and prevents damage
to the ultrasonic treatment applicator by the heat that would be generated in the
ultrasonic transducer if it was operated unloaded at high power levels.
Metron Accusonic Plus
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Version 1.6 March 2002 Page 5 of 12
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