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An agar phantom for hyperthermia
Author(s) -
Kato Hirokazu,
Hiraoka Masahiro,
Ishida Tetsuya
Publication year - 1986
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595882
Subject(s) - imaging phantom , materials science , biomedical engineering , analytical chemistry (journal) , nuclear medicine , chemistry , medicine , chromatography
An agar phantom with wide application in rf heating was developed. The phantom consists of 4 wt./wt. % agar powder, 0.1 wt./wt. % NaN 3 , 0–0.6 wt./wt. % NaCl, and 95.9–95.3 wt./wt. % water. The conductivity σ (S/m) of the phantom was independent of frequency at 1–40 MHz, being σ=1.74 x +0.207 at 23.5±1 °C, where x is the concentration of NaCl (wt./wt. %). The permittivity was nearly equal to 81 in the range of 5–40 MHz and 0–0.6 wt./wt. % of NaCl. The density and the heat capacity of the phantom were 1.02×10 3 kg/m 3 and 1.00 kcal/kg °C, respectively. The phantom had sufficient mechanical strength to permit construction of a torso 60 cm high. With the addition of a preservative, the phantom could be used for experiments on heating, without degeneration, for over one year.