ID Number		2668
Study Type		Human / Provocation
Model		Heating rates of human skin exposed locally to 42.25 GHz mm waves, coming from a waveguide (WG) opening or a YAV device designed for therapeutic application, were studied in vivo using infrared (IR) thermography.
Details		AUTHORS' ABSTRACT: Alekseev and Ziskin 2003 (6610): Heating rates of human skin exposed locally to 42.25 GHz mm waves, coming from a waveguide (WG) opening or a YAV device designed for therapeutic application, were studied in vivo using infrared (IR) thermography. For both radiators, the power density distribution was described by a circularly symmetrical Gaussian type function on the exposed skin surface. Insertion of a small thermocouple (d = 0.1 mm) in the exposed area did not produce any significant artifact, either in the power density distribution or kinetics measurement, providing it was perpendicular to the E vector. The heating kinetics in the skin exposed with either the WG opening or the YAV device were well fitted to solutions of the 2-D bio-heat transfer equation for homogeneous tissue. Changes in irradiating beam size (1-8 mm) had no detectable effect on the initial (0.3-3.0 s) phase of the heating kinetics. However, the amplitude of the kinetics decreased substantially with decreasing the beam size. As the temperature rise in the time interval necessary for reliable measurement of the initial temperature rise rate was very small, an accurate experimental determination of specific absorption rate (SAR) becomes practically impossible at the low intensities normally used in our experiments. The correct SAR values may be found from fitting of the model to the heating kinetics.
Findings		Effects (only at thermal levels)
Status		Completed With Publication
Principal Investigator		USSR Acad. of Science, Moscow Russia
Funding Agency		?????
Country		RUSSIAN FEDERATION
References		Alekseev, SI et al. Bioelectromagnetics., (2005) 26 (Suppl 7):489-501 Alekseev, SI et al. Bioelectromagnetics., (2003) 24:571-581 Alekseev, SI et al. Biophysics., (2012) 57:90-93
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