Department of Ultrasound the Sixth People's Hospital Shanghai Jiaotong University Shanghai 200233 China;
Department of Ultrasound the Sixth People's Hospital Shanghai Jiaotong University Shanghai 200233 China;
Department of Ultrasound the Sixth People's Hospital Shanghai Jiaotong University Shanghai 200233 China;
radiofrequency ablation; hypertonic saline solution; ex vivo study;