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AIM:To evaluate the role of multiphasic scanning bymultirow-detector helical CT(MDCT)in detecing smallhypervascular hepatocellular carcinoma(SHCC).METHODS:Multiphasic scanning was carried out in 75patients with SHCC with Marconi MX8000 CT scanner.Theearly arterial phase(EAP),late arterial phase(LAP)and theportal venous phase(PVP)scans were started at 21 s,34 sand 85 s respectively.The mean difference of CT valuesbetween tumor and liver parenchyma for each scanningphase was measured,and the sensitivity of detection ofSHCC in each of these phases and in the combined phasewas calculated and statistically analyzed.RESULTS:The mean difference of CT values between tumorand liver parenchyma was significant in 71 lesions≥1 cm inthree phases(P<0.05).In 91 tumor foci,the detectabilityof SHCC was 45.1%,83.5 % and 92.3 % in EAP,LAP anddouble arterial phases(DAP),respectively.The early arterialphase plus the portal venous phase and the double arterialphase plus the portal venous phase were 94.5 %,97.8 %,respectively.Whereas the detectability in LAP plus PVP andin DAP plus PVP had no statistical difference.CONCLUSION:The utility of faster speed and thinner sliceMDCT and multiphase scanning protocol can improve thedetectability of hypervascular small hepatocellular carcinoma.Among which LAP is superior to EAP in depicting the lesions.
AIM: To evaluate the role of multiphasic scanning by multirow-detector helical CT (MDCT) in detecing smallhypervascular hepatocellular carcinoma (SHCC). METHODS: Multiphasic scanning was carried out in 75 patients with SHCC with Marconi MX8000 CT scanner.The final arterial phase (EAP), Late arterial phase (LAP) and the venous venous phase (PVP) scans were started at 21 s, 34 sand 85 s respectively. The mean difference of CT values between tumor and liver parenchyma for each scanning was measured, and the sensitivity of detection of SHCC in each of these phases and in the combined phase was calculated and analyzed. RESULTS: The mean difference of CT values between tumorand and liver parenchyma was significant in 71 lesions ≥ 1 cm in threes phases (P <0.05). In 91 tumor foci, the detectability of SHCC was 45.1%, 83.5% and 92.3% in EAP, LAP and double arterial phases (DAP), respectively. The early arterial phase plus the portal venous phase and the double arterial phase plus the portal venous phase were 94.5% , 97.8% respectively. Here the detectability in LAP plus PVP and in DAP plus PVP had no statistical difference. CONCLUSION: The utility of faster speed and thinner slice MDCT and multiphase scanning protocol can improve thedetectability of hypervascular small hepatocellular carcinoma. Among which LAP is superior to EAP in depicting the lesions.