The post-HIFU MRI showed the nonperfused volume ( NPV ) in all of the treated uterine fibroids ; the mean fractional ablation ( NPV ratio ) was 90.4 8.3 % ( range 66.4-100 % ) in the SonoVue group and 82.8 13.3 % ( range 53.4-100 % ) in the control group .