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Errata is a Medicine article available to read on EtoBox.

What is Errata about?

has drawn attention to an error which I have been guilty of perpetuating since the publication of my first book2 in 1969, and I am most grateful to him. The absorption coefficient for ultrasound in air at STP is 1.2 dB cm-l at 1 MHz, and not 12 dB cm-'. While not wishing to be complacent either about my own mistake or about the possible hazards of ultrasound, I think that sonographers and others using diagnostic ultrasound should not get the impression that they are being exposed to dangerous intensities. Besides the protection due to the absorption of ultrasound in air, which increases with the square of the frequency, the intensity of ultrasound entering the exposed part of the body is greatly attenuated by the reflection at the boundary between air and skin. At normal incidence, only about one thousandth (ie, -30 dB) of the airborne ultrasonic energy at the surface of the skin actually enters the body. Yours sincerely,

Who reads Errata?

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0091-2751)

Published

1982

Language

EU

Field

Medicine (Health Sciences)