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Abstract Objective：To explore the best time point and the distribution range of the imaging of hepatic portalvein using 256-slice spiral CT perfusion technique，to find the best way in the hepatic portal vein scanning.Method：30 patients underwent upper abdominal scanning by 256-slice Spiral CT in the first. Done the continuous dynamic scanning delaying 5 s after injection of contrast agents，then observe the whole process of the hepatic portal imaging to get the best distribution range of exposure time. According to this distribution range to set exposure points， then 57 patients underwent upper abdominal scanning. Interval scanning were done delaying 25 s after injection of contrast agents， and the interval of exposure time was 5 s， then taken four times exposures， the time points were 25， 30， 35， 40 s. Elected the best phase from the four groups of hepatic portal vein imaging to reconstruct CTV. The CT value of hepatic， liver and calculated D-value to assess the quality of images were measured. the correlation between the best time point distribution of portal vein and heart rate， weight， height of subjects were analyzed.Result： Best images could be obtained in 95% patients using multitemporal timing scanning delaying 25-40 s after injecting of contrast agents. This result had correlation with patients’heart heart rate（ P<0.05），but had no correlation with patients’ height and weight（ P>0.05）.Conclusion：Multitemporal timing scanning using 256-slice Spiral CT was another reliable method of hepatic portal vein imaging.
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