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Christiansen, M. (2023). Ultralydskanning i graviditeten. Retrieved April 4, 2024, from ... kanning-i-graviditeten/   
Added by: Mark Grimshaw-Aagaard 4/4/24, 12:47 PM
"Hvor farlig er ultralydskanning i graviditeten?

Ultralyd i forbindelse med graviditet og fødsel har været anvendt gennem de sidste 30 år. Der findes ingen undersøgelser, som peger på, at ultralyd har skadelige bivirkninger. Og der er ingen strålerisiko som ved røntgen. Undersøgelser af langtidseffekter på børn, som har været udsat for ultralydskanning i graviditeten, viser ingen skadelige virkninger, hverken på vækst, sprog eller fysisk udvikling."

Leighton, T. G. (2007). What is ultrasound? Progress in Biophysics and Molecular Biology, 93(1–3), 3–83.   
Added by: Mark Grimshaw-Aagaard   Last edited by: Mark Grimshaw-Aagaard 4/6/22, 12:16 PM
"Foetal ultrasonic scanning is now so established in industrialised nations that it would now be difficult to find a control group for epidemiological studies."
"The limiting feature for the use of ultrasound in air is the severe absorption which rapidly reduces the amplitude of the field, as it propagates away from the source, to levels which are too low for most processing activities, or even to provide sufficient signal-to-noise ratios (SNRs) for many diagnostic applications. There is however one exception, the manifestation of which illustrates a key point which must be appreciated in the assessment of the safety of ultrasound in air.
"The human ear is an extremely sensitive sensor for acoustic waves. Intensities which are low by the standards used for ultrasonic diagnostic technology, and certainly for ultrasonic processing, are generally very much higher than the maximum intensities which the human ear can sustain at audio frequencies without damage. Therefore when ultrasound is used to generate signals to which the ear can responds [sic] (which may not necessarily be restricted to audio frequencies—see Section 6), whilst the resulting intensities may be thought of as ‘low’ from the perspective of many ultrasonic technologies, they may be ‘high’ from the perspective of the ear. This point is discussed further in Section 7."
"Given the paucity of information on the safe levels for human exposure to ultrasound in air (Section 6), and the lack of traceability for the measurement of such fields (see Section 2.3), this could be a safety issue."