TABLE II.

Ablation zone dimensions and reflection coefficients created by dual-slot and monopole antennas in ex vivo bovine liver. Data presented as mean ± standard deviation. NS indicates no statistically significant difference.

	Time (min)	Diameter (mm)	Length (mm)	Aspect ratio	G (initial) (dB)	G (final) (dB)	G (Time-average) (dB)
Dual-slot	2	19.1 ± 0.9	26.9 ± 1.7	0.711 ± 0.01	−18.9 ± 5.9	−12.5 ± 2.4	−15.7 ± 3.4
	5	25.7 ± 1.6	37.6 ± 1.4	0.683 ± 0.05	−19.1 ± 4.1	−10.2 ± 2.4	−14.7 ± 2.8
	10	34.7 ± 2.4	49.2 ± 2.1	0.706 ± 0.03	−19.2 ± 9.2	−09.2 ± 2.1	−14.2 ± 5.6
Monopole	2	16.4 ± 1.5	31.6 ± 4.3	0.528 ± 0.08	−17.9 ± 5.6	−21.2 ± 9.8	−19.6 ± 5.1
	5	23.4 ± 2.0	46.0 ± 3.9	0.513 ± 0.07	−19.7 ± 1.7	−14.2 ± 5.4	−16.9 ± 2.0
	10	31.1 ± 2.1	59.6 ± 6.3	0.527 ± 0.06	−20.2 ± 5.4	−12.1 ± 4.3	16.1 ± 2.3
Dual-slot v.	2	NS	NS	<0.001	NS	NS	NS
Monopole	5	NS	<0.01	<0.001	NS	NS	NS
P-values	10	<0.05	<0.001	<0.001	NS	NS	NS