Figure 1.

Anatomic MR images and analysis. A. Representative MR images before and after IRE ablation. Pre- and post-contrast T1w images as well as T2w images are shown. IRE treatment margins are traced by red dashed lines. B. Changes in signal intensity averaged across entire IRE-treated region. Signal was normalized to paraspinal muscle intensity, which are similar across all images. *Represents significant differences in Δintensity before and after IRE treatment (P<0.005). Statistical difference was assessed by t-test. C. Changes in pre-contrast T1w intensity in untreated tisues and Ire treatment zone. Zignal intensity is normalized to paraspinal muscle intensity. Differences in signal intensity was assessed by one-way ANOVA. *Represents significance (P<0.05).