Ultrasound-guided multiple-spot sector stereotaxis in unipolar cooling cycle radiofrequency ablation of hepatic carcinomas

Objective To assess the effect of ultrasound-guided multiple-spot sector stereotaxis in unipolar cooling cycle radiofrequency ablation of hepatic carcinomas.Methods Ninety-six patients with 112 liver malignancies were treated with ultrasound-guided percutaneous radiofrequency ablation using multiple-spot sector stereotaxis method.Conventional multi-section ultrasound scanning was performed to determine the exact location of tumors.Contrast enhanced ultrasound(CEUS) was performed 15 minutes after treatment to determine whether the tumors were completely inactivated.Contrast enhanced CT(CECT) and CEUS were performed 1 month after treatment to evaluate the therapeutic effect.Results A total of 293 punctures were performed for 112 tumors,technical successful rate with a successful rate of puncture was 91.81%(269/293).CEUS showed no blood flow signals in the tumors 15 minutes after therapy.One month after therapy,CT showed the volume of tumors shrunk,no enhancement was found in 100 tumors(100/112,89.29%),while partial reinforcement was noticed in 12 tumors(10.71%).Meanwhile,CEUS showed no enhancement in 90 tumors(90/103,87.38%),when partial reinforcement was noticed in 13 tumors(13/103,12.62%).Conclusion Ultrasound-guided multiple-spot sector stereotaxis unipolar cooling cycle radiofrequency ablation is an effective and reliable method to treat hepatic carcinomas.