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Comparative study of shortwave heating patterns in phantoms with polyethylene and silk partitions
Author(s) -
Moon Chun Y.,
Kantor Gideon,
Athey T. Whit,
Ho Henry S.
Publication year - 1988
Publication title -
bioelectromagnetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 81
eISSN - 1521-186X
pISSN - 0197-8462
DOI - 10.1002/bem.2250090107
Subject(s) - silk , polyethylene , imaging phantom , shortwave , materials science , polyethylene terephthalate , specific absorption rate , absorption (acoustics) , diffusion , optics , composite material , thermodynamics , radiative transfer , physics , computer science , telecommunications , antenna (radio)
Specific absorption rate (SAR) and effective depths of heating patterns induced by a shortwave, pancake diathermy applicator in fat‐muscle phantom are measured. Midplane partitions of polyethylene and silk screen with and without contact chemicals are used. Thermographically obtained SAR data show nearly the same value for silk‐screen partitions with and without contact chemicals and slightly lower values with polyethylene partitions, provided that the partition midplanes are tightly pressed against each other. Thermometry data indicate that for low‐power exposures the major error in thermographic measurements obtained after termination of heating is due to thermal diffusion and not evaporative cooling in the opened midplane of the phantom.