Cancer experts introduce that Computed Tomography can reflect the liver pathological form performance such as lesion size, shape, location, and presence of lesions number hemorrhaging necrosis in photography checking. Computed Tomography is considered as the first choice of non-invasive diagnosis method that Supplementary

ultrasonography -- estimated lesions range. Liver cancer Computed Tomography manifestations : Lesions is commonly low density and below the peripheral parenchymal density. There is layer of lower density ring shadows in parts of lesion around. Enhanced performance

refers to lesions and liver tissue density cann’t get certain enhancement after intravenous iodine contrast agents. I includes:

First, dynamic enhance scanning. It adopts regiment method dynamic scanning or spiral Computed Tomography rapid scanning. Early lesion is high--density enhance and is higher than normal liver tissue time 10-30 seconds. Then lesions density fell rapidly and is close to normal liver tissue density. Liver tissue will be low density leison if leison density continue to fall. It can continue several minutes. Dynamic scanning early enhance picture is easy to find skatellite leison that mass diameter is less than 1cm or 1-2cm.

 Second, Non- dynamic scanning: General scanning is 15 seconds at least and so lliver level of leison is a different density in dynamic scan in any terms. Most of leisons are located in low density term and so leisons decrease obviously

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