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Original Article

Phantom characterization of applicators by liquid-crystal-plate dosimetry

, , , &
Pages 175-183 | Received 25 Oct 1989, Accepted 06 Apr 1990, Published online: 09 Jul 2009
 

Abstract

A method for the determination of the S AR distribution produced by an electromagnetic applicator for localized hyperthermia is described. The procedure for SAR evaluation consists of recording the time evolution of the temperature inside a polyacrylamide phantom by means of thermochromic liquid crystal sheets inserted in it. The technique allows a complete characterization of applicators in a very broad frequency range, using power levels of the order of those needed in real treatments. Criteria for the minimum phantom size and the maximum time duration of the characterization procedure are indicated, which allow a reliable determination of the effective field size and penetration depth of the applicator.

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