Table 1. Technical Tips for Safe and Complete RF Ablation.

Technical Tips	Desired Effects
Tips for safe RF ablation
Artificial ascites technique	To prevent thermal injury to heat-vulnerable organs
To perform procedure when patients breathe shallowly	To decrease risk of tear of hepatic parenchyma
Cooling of bile ducts with nasobiliary drainage tube	To minimize biliary complications
Needle track ablation technique	To reduce tumoral seeding along needle tract
Gradual increase of RF energy	To avoid transportal spread by popping of index tumors
Tips for complete RF ablation
Fusion imaging of US with CT/MR imaging	Correct targeting of index tumors with poor conspicuity
Parallel targeting	Wider ablation zone in tumors abutting large vessel
Placement of needle along long axis of tumor	Complete ablation of fusiform tumors
To ablate intrahepatic portion first for exophytic tumor	Successful ablation of exophytic tumors
Bypass targeting	Complete ablation of index tumors in caudate lobe

RF = radiofrequency, US = ultrasound