Frequency dependence of threshold ultrasonic dosages for irreversible structural changes in mammalian brain F. Dunn, J. E. Lohnes, and F. J. Fry* Bioacoustics ResearchLaboratory, Universityof Illinois, Urbana, Illinois 61801 (Received14 April 1975;revised12 May 1975)
Thresholdultrasonicsingle-pulse exposures for irreversible structuralchanges in the mammalian brainhave been extendedto include the frequencies1, 3, 4, 4.5, and 9 MHz. The acousticintensitiesof the delivered
doses rangefr9mapproximately 102W/cm2to 2>
Thresholdultrasonicsingle-pulse exposures for irreversible structuralchanges in the mammalian brainhave been extendedto include the frequencies1, 3, 4, 4.5, and 9 MHz. The acousticintensitiesof the delivered
doses rangefr9mapproximately 102W/cm2to 2>
