Interpretation for MRI signal evolution of hepatic tumors after microwave ablation
Author(s): JIA Zhenyu, CHEN Qifeng, WU Wentao, LIU Sheng, SHI Haibin, YANG Zhengqiang
Pages: 324-328
Year: 2017 Issue: 4
Journal: Journal of Interventional Radiology
Keyword: microwave; ablation; liver; tumor; magnetic resonance imaging;
Abstract: Objective To make an interpretation for the time-related evolving process of magnetic resonance imaging (MRI) signal of hepatic tumors after microwave ablation (MWA) treatment.Methods A total of 56 patients with malignant hepatic tumors (56 lesions in total) were enrolled in this study.Upper abdominal MRI plain scan and enhanced scan were performed in all patients at the second day,one month and 6 months after MWA treatment.The MRI signal features of ablation zones at different time points on T1WI,T2WI,DWI as well as on contrast-enhanced T1WI were documented,and the judgment of whether there was tumor recurrence was made.Results Two days after MWA,the ablation zone was manifested as target-like structure on T1WI and T2WI,which was characterized by central high signal ablation zone with low signal band around on T1WI and low signal ablation zone surrounded by high signal band on T2WI.One and 6 months after MWA,the volume of ablation area was atrophied,the target-like structure could still be observed on T1WI and T2WI,and the signal of ablation zone became intensified.Contrast-enhanced MRI revealed that abnormal high perfusion sign could be observed around the ablation zone,and on MRI scans performed at two days,one and 6 months after MWA,the ablation zone showed no enhancement.DWI indicated that two days after MWA the signal around the ablation zone was heightened,which decreased gradually in one and 6 months after MWA.Conclusion The signal of the ablation zone of hepatic tumor after MWA is evolving over time.Correct interpretation of MRI signal of ablation zone is helpful for the judgment of curative effect and for the making of therapeutic plan.
Pages: 324-328
Year: 2017 Issue: 4
Journal: Journal of Interventional Radiology
Keyword: microwave; ablation; liver; tumor; magnetic resonance imaging;
Abstract: Objective To make an interpretation for the time-related evolving process of magnetic resonance imaging (MRI) signal of hepatic tumors after microwave ablation (MWA) treatment.Methods A total of 56 patients with malignant hepatic tumors (56 lesions in total) were enrolled in this study.Upper abdominal MRI plain scan and enhanced scan were performed in all patients at the second day,one month and 6 months after MWA treatment.The MRI signal features of ablation zones at different time points on T1WI,T2WI,DWI as well as on contrast-enhanced T1WI were documented,and the judgment of whether there was tumor recurrence was made.Results Two days after MWA,the ablation zone was manifested as target-like structure on T1WI and T2WI,which was characterized by central high signal ablation zone with low signal band around on T1WI and low signal ablation zone surrounded by high signal band on T2WI.One and 6 months after MWA,the volume of ablation area was atrophied,the target-like structure could still be observed on T1WI and T2WI,and the signal of ablation zone became intensified.Contrast-enhanced MRI revealed that abnormal high perfusion sign could be observed around the ablation zone,and on MRI scans performed at two days,one and 6 months after MWA,the ablation zone showed no enhancement.DWI indicated that two days after MWA the signal around the ablation zone was heightened,which decreased gradually in one and 6 months after MWA.Conclusion The signal of the ablation zone of hepatic tumor after MWA is evolving over time.Correct interpretation of MRI signal of ablation zone is helpful for the judgment of curative effect and for the making of therapeutic plan.
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