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Sonographic heat generation in vivo in the gravid long‐tailed macaque (Macaca fascicularis)
Author(s) -
Tarantal A F,
Chu F,
O'Brien W D,
Hendrickx A G
Publication year - 1993
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.1993.12.5.285
Subject(s) - medicine , in vivo , nuclear medicine , pulse (music) , doppler effect , pulse repetition frequency , biomedical engineering , optics , telecommunications , radar , physics , microbiology and biotechnology , astronomy , detector , computer science , biology
Temperature elevations that occur during diagnostic ultrasonic exposure were assessed in vivo in gravid macaques after 10, 20, or 30 min (scan mode; N = 30) or 5, 10, or 15 min (pulsed Doppler; N = 32). Five time points were assessed during the second and third trimesters (gestational days 70 to 150 +/‐ 2; term, approximately 165 days) using a transient thermocouple technique. Measurements were obtained intracranially or at the muscle‐bone interface using a commercial sector scanner (ATL MK 600, 7.5 MHz scanhead; scan mode, ISPTA) = 27 mW/cm2, ISPPA = 85 W/cm2, pulse repetition frequency (PRF) = 1 kHz; pulsed Doppler ‐ ISPTA = 54 mW/cm2, ISPPA = 1.5 W/cm2, PRF = 18.5 kHz). Overall, the greatest temperature elevation achieved with either modality or location was 0.6 degrees C.