Note that, because of the technique and equipment limitation, our experiments provide two-dimensional images of the whole RFA process, which is also clear enough to validate the visibility and conformality of our electrode during an in vivo ultrasound-guided RFA. Although experienced physicians are able to clinically pinpoint the 3D information of electrode and target tissues for successful conformal RFA,\cite{Ritz_2005,Peng_2010} we still suggest CT-fused 3D ultrasound imaging for high-quality, real-time 3D guidance of the whole procedure.\cite{Lee_2014}