Fludeoxyglucose F 18-PET Imaging for Early Detection of Residual Disease in Patients Undergoing Radiofrequency Ablation of Liver Metastases From Colorectal Cancer

All patients will undergo pre RFA PET prior to ablation for intra and extrahepatic staging and to assess FDG avidity of the lesions. When evaluating patients with liver metastases, we routinely obtain a dedicated liver PET study (Liver View) after the whole body PET. Patients will undergo two post RFA PET scans as part of this project: PET # 1) within 32 hours after RFA. The patients having percutaneous RFA will undergo PET on the same day after the clinical studies at the PET facility are completed; this will be within 8 hours after RFA. In case of laparoscopic and intra-operative RFA, PET will be performed on the following day after the clinical studies are completed; this will be within 32 hours after RFA. PET # 2) on day seven after RFA

All patients will undergo pre RFA PET prior to ablation for intra and extrahepatic staging and to assess FDG avidity of the lesions. Patients will undergo two post RFA PET scans as part of this project: PET # 1) within 32 hours after RFA. The patients having percutaneous RFA will undergo PET on the same day after the clinical studies at the PET facility are completed; this will be within 8 hours after RFA. In case of laparoscopic and intra-operative RFA, PET will be performed on the following day after the clinical studies are completed; this will be within 32 hours after RFA. PET # 2) on day seven after RFA