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FIGURE 6.  Graph comparing early- and delayed-phase T/M ratios in treated and untreated VX2s. T/M ratios of RFA-treated VX2s at 1 d and 1 wk are significantly different from those of untreated VX2s on both early-phase and delayed-phase scanning (^*P < 0.001). Outer-layer T/M ratios of tissues surrounding treated VX2s at 1 d and 1 wk are significantly different from those of untreated VX2s on both early-phase and delayed-phase scanning (P < 0.01). Outer-layer T/M ratios of tissues surrounding treated VX2s at 1 d and 1 wk are also significantly different from those of treated VX2s on both early-phase and delayed-phase scanning (P < 0.05). In treated VX2s, T/M ratios at early phase do not significantly differ from those at delayed phase (P = 0.57 and 0.48, respectively), but in untreated VX2s and outer layer, which correlated with ring-shaped ¹⁸F-FDG accumulation, T/M ratios are higher on delayed-phase images than on early-phase images at both 1 d and 1 wk (P < 0.05).

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