Mice in MW-transparent rodent restrainers were placed in the horizontal plane below the septum on a support of dielectric material with their longitudinal axis parallel to the main axis of the GTEM cell, in a location where matching conditions were optimized.
Background magnetic flux density (5 Hz-2 kHz) was in the range of 0.2-0.5 µT.
Mess- und Berechnungsdetails
The electric field pattern was measured using a triaxial probe, connected via an optical cable to a field meter having an overall calibration uncertainty of ±1.5 dB. A bidirectional coupler and a bichannel power meter were used to monitor direct and reflected powers. The whole-body and specific tissue SARs were calculated by numerical dosimetry, using the FDTD method and a 20-g mouse voxel model obtained by spiral Computerized Axial Tomography (CAT) scan, where 11 kinds of tissue were recognized and dielectric properties assigned according to Gabriel and Gabriel . Exposure to a plane wave with propagation along the longitudinal axis of the animal and the E-field vertical was simulated, and results were validated by temperature rise measurements (CW at 7 W) performed on a homogeneous cylindrical 20-g phantom (with a cone tip) placed in the position of the mouse. The overall uncertainty on SAR results did not exceed ±30%. Gabriel C, Gabriel S. 1996. Compilation of the dielectric properties of body tissues at RF and microwave frequencies. London, UK: Physics Department, King's College. http://niremf.ifac.cnr.it/docs/DIELECTRIC/Report.html
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