Temperature elevation in the rat fetus due to ultrasound exposure.
The temperature elevation resulting from sonically generated heat in rat fetuses was measured for various intensity levels. The temperature elevation produced inside the fetus was higher than that on the outside surface. In live fetuses, a portion of the heat generated was carried off by the circulating blood. The temperature elevation curves were used to estimate the absorption coefficient of rat fetuses. Absorption coefficient values range from 0.065 to 0.086 Np/cm at 1 MHz. The present results are consistent with a theoretical model of temperature elevation in a heated sphere.
Department of Diagnostic Imaging, Temple University School of Medicine, Philadelphia, PA.
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Abraham
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Ziskin
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Heyner
D000818:Animals; D001831:Body Temperature; D005260:Female; D005333:Fetus / Q000502:physiology*; D006358:Hot Temperature; D011247:Pregnancy; D051381:Rats; D011919:Rats, Inbred Strains; D014465:Ultrasonics / Q000009:adverse effects*