Table 1:

Diff = Mean absolute difference in diameter (mm) between imaging findings at the completion of ablation and pathology. PD= the average percent difference for each measured field. R² is the coefficient of determination from simple linear regression between imaging findings and zone of pathologic necrosis, with imaging underestimating the final zone of pathologic necrsosis.

	US gas				US hypoechoic				CT gas				CT hypoattenuating
	Diff	SD	PD	R2	Diff	SD	PD	R2	Diff	SD	PD	R2	Diff	SD	PD	R2
70 W MW	2.8	1.3	13.5%	0.71	1.4	1.5	7.2%	0.77	7.3	3.3	33.7%	0.54	5.0	2.1	24.5%	0.67
140 W MW	3.5	2.0	12.8%		1.6	1.4	5.7%		7.9	3.6	29.3%		6.3	3.5	23.0%
200 W RF	6.4	6.3	26.7%	0.03	4.5	3.8	19.4%	0.26	13.9	4.6	66.7%	0.43	4.3	3.5	19.5%	0.34