modulation as in the reference article simulating the main frames of the GSM system (2, 8, 217, 1736 Hz)
Abstand zw. exponiertem Objekt und Expositionsquelle
Subjects were sitting on a chair with their heads between to plates to ensure a well-defined position with respect to two matched planar antennas mounted on both sides of the head at a distance of 11 cm from the ear with their centres 4.2 cm vertically above the ear canal.
The experiment consisted of three sessions one week apart involving right or left hemisphere and sham exposure scheduled according to a randomized, double-blind, cross-over design.
In order to achieve a relatively homogeneous exposure of the brain hemisphere, the ratio of averaged SAR values between the two hemispheres was only ~5.
Mess- und Berechnungsdetails
Detailed dosimetric analysis was performed with the SEMCAD simulation platform based on the MRI data set of the head of a female subject aged 40. Numerical dosimetry was verified using the near-field scanning system DASY3 and a generic twin phantom filled with tissue simulating liquid, and the correspondence was better than 10%. Effects of the electrodes resulted in a reduction of the spatial peak SAR of ~10%. The uncertainty of the dosimetry was estimated to be less than ±30%.