Preliminary investigation of numerical estimation of coagulated region generated by interstitial microwave antenna

Figures & data

Figure 1. Fundamental characteristics of biological tissue regarding coagulation. (a) Experimental schema. (b) Relation between temperature and coagulation time of porcine liver tissue.

Figure 2. Structure of coaxial-slot antenna.

Table 1. Dimensions and relative permittivities of the coaxial-slot antenna.

db (diameter of the antenna) [mm]	1.19
dc (external diameter of the catheter) [mm]	1.79
tc (thickness of the catheter) [mm]	0.3
Lts (length from the tip to the centre of the upper slot) [mm]	20.0
Lls (length from the tip to the centre of the lower slot) [mm]	10.0
Wsl (width of the slot) [mm]	1.0
Dt (insertion depth) [mm]	60.0
ɛrc (relative permittivity of the inner dielectric)	2.03
ɛri (relative permittivity of the catheter)	2.6

Figure 3. Calculation algorithm for estimation of coagulated region.

Table 2. Electrical and thermal properties of media.

	Liver	Antenna (catheter)
Relative permittivity	43.03	2.6
Conductivity [S/m]	1.69	–
Thermal conductivity [W/m/K]	0.52	0.25
Specific heat [J/kg/K]	3540	1046
Density [kg/m^3]	1060	2200
Volumetric perfusion rate [1/s]	0.0	–

Figure 4. Experimental and calculated results.