Radiologists use several medical images technics in
order to visualize the liver and its internal
structures. Echography is used as the first visualization
reference exam. If a suspect image is repeared, a more precise
technic is then used. Generally, radiologists prefer CT-Scan to
MRI, due to a less cost and a similar quality of the images. In
order to visualize the portal vein required for liver segments
delimitation, these CT-Scans are performed at the portal time
after an injection of a contrast product in the veinous network
(the product is then localized in the portal vein). Two
modalities are used in routine:
portoscanner, much invasive and painful for the patient,
gives high contrast images.
intraveinous, non invasive and comfortable for the patient,
gives less images de moins bonne qualité.
We used a data base composed to 32 images principally realized
with intraveinous modality and offering a great variability
beetween patients. Thus, in this data base there is patient with
lesions (Kystes or tumors), safe patients or patients who having
undergo a partial ablation of the liver. At least, the morphometry
of data base patients is much variable, which explain differences
in the image quality due to a portal time evaluation non perfect
because difficult.
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