Kato H, Hiraoka M, Ishida T
Med Phys. 1986 May-Jun;13(3):396-8. doi: 10.1118/1.595882.
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 sigma (S/m) of the phantom was independent of frequency at 1-40 MHz, being sigma = 1.74 chi + 0.207 at 23.5 +/- 1 degrees C, where chi 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 X 10(3) kg/m3 and 1.00 kcal/kg degree 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.
开发了一种在射频加热中具有广泛应用的琼脂体模。该体模由4 wt./wt.%的琼脂粉、0.1 wt./wt.%的NaN₃、0 - 0.6 wt./wt.%的NaCl和95.9 - 95.3 wt./wt.%的水组成。在1 - 40 MHz频率范围内，该体模的电导率σ（S/m）与频率无关，在23.5 ± 1℃时，σ = 1.74χ + 0.207，其中χ是NaCl的浓度（wt./wt.%）。在5 - 40 MHz以及0 - 0.6 wt./wt.%的NaCl范围内，相对介电常数几乎等于81。该体模的密度和热容分别为1.02×10³ kg/m³和1.00 kcal/kg·℃。该体模具有足够的机械强度，能够构建一个60厘米高的躯干模型。添加防腐剂后，该体模可用于加热实验，且一年多不会变质。
