List two clinical applications of radiofrequency ablation, apart from ablating tumours. (b) describe the biological mechanism of radiofrequency ablation for treating tumours, referencing the three zones of ablation. (c) a 7fr (2.33 mm diameter) ablation probe of length 4 mm is inserted into a liver tumour, with a conductivity (o) of 0.7 s/m. calculate the tissue resistance immediately surrounding the ablation electrode.