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The field uniformity and cross-polar performance inside a GTEM 1750 have been measured from 0.08 GHz to 6 GHz, and the results show that propagation above 3 GHz is no longer predominantly TEM mode. A computer simulation of the GTEM confirmed this. Further, the fields generated by a quad-ridged lens horn placed inside the GTEM showed that a well polarized transmitter inside the GTEM will generate significant...
This paper examines the measurement of the specific absorption rate (SAR) of radio frequency energy during magnetic resonance imaging using an optical electric field sensor (OEFS). The sensor was used to measure SAR in a simple phantom during a 3-Tesla MRI scan and the results compared to computer simulations and also those obtained through temperature measurements. Good agreement is demonstrated...
E-field probes used for measurement of worker exposure are usually calibrated in continuous wave (CW) conditions. For many types of probe, the response in realistic environments (modulated signals, multi-frequency and pulsed signals) differs from the response to CW conditions. However, to fully characterize a field probe in all possible environments would be an infinite task. In this paper we consider...
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