An agar phantom with wide application in rf heating was developed. The phantom consists of 4 wt./wt. % agar powder, 0.1 wt./wt. % NaN3, 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=1.74x+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 1.02–103 kg/m3 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.
- DIELECTRIC PROPERTIES
- MICROWAVE RADIATION
- TISSUE-EQUIVALENT MATERIALS
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging