Figure 11

Posttreatment images of the treated facet joints and treatment effect on facet joints treated with higher energies. Axial T1-weighted contrast-enhanced MR image (left) showing small nonenhanced area in the right facet joint that was treated with 450 J and soft tissue edema on the left facet joint that was treated with 150 J. This correlates well with the axial PD MR image on the right with blue dose overlay (predicated area of ablation). The lower strip shows multi-slice coronal T1-weighted contrast-enhanced subtraction MR images showing NPV on the right facet joints that were treated with 450 J and soft tissue edema adjacent to the left facet joints that were treated with 150 J, which correlate well with the blue dose overlay on multi-slice coronal PD MR images in the upper strip.