Caren van Roekel

301 Summary In chapter 8, the effect of coil-embolization of tumor-feeding arteries to obtain intrahepatic redistribution was assessed in 37 patients. This was done both qualitatively and quantitatively, using a visual scale and using the ratio of the activity distribution in the coil-embolized segments/tumors versus the other segments/tumors. In the qualitative analysis, redistribution was deemed successful in 69% of cases. The median activity concentration ratio was 0.88 (range 0.26-2.05) for segments and 0.80 (range 0.19-162) for tumors. Different cutoff values (see figure 8A) were used to determine the percentage of successful cases. For example, using a cutoff value of 0.8 (20% lower activity concentration in the coil-embolized segments than in the other segments), the success rate was 43%. Based on these results, it is recommended to use the redistribution technique only when deemed absolutely necessary. 11