Ultrasound Dosage for Experimental Use on Human Beings.
Medical resarch interim rept.,
NAVAL MEDICAL RESEARCH INST BETHESDA MD
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A schedule of safe ultrasound dosage ofr experimental use on normal human beings was fromulated from available literautre. The zone of safety for continuous wave ultrasound lay below a loglog line connecting 1 microsec of 1 kw sq cm ultrasound with 200 seconds of 100 mwsq cm ultrasound. An ultrasonic intensity of 100 mwsq cm or less was also safe for at least 10,000 seconds. Pulsed wave ultrasound was safe for doses in which the average intensity multiplied by the total exposure time lay within this zone of safety. The zone of safety was valid for 0.5 to 15 MHz and for all anatomic sites except the eyes. Re-exposures were limited to 10 per month and 30 per year. Author