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In conventional SAR testing, 2D scans close to the phantom surface are always conducted first to find the location of the maximum SAR. Experience shows that the value of the maximum SAR obtained in the initial 2D scan is strongly correlated with the subsequent 3D measurements performed for direct measurement of the volume averages. This means that most of the information concerning the volume-averaged SAR measurements is actually contained in the data of the 2D scan.
Because the sphere is a well-studied canonical phantom shape, published information exists on the characteristic decay rate of SAR values with depth into such spheres at different frequencies and liquid formulations. So, with a knowledge of the frequency of the test source, the correct decay rate can be applied to construct a 3D data field from the data from the 2D scan. This allows conventional averaging schemes to be applied to the determination of 3D, volume-averaged SAR values from the 2D data.
Comparative results obtained with both MapSAR and full 3D scanning measurements show a high degree of correlation giving confidence in the use of the 2D approach.
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