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Liver hypodensity on a CT scan is caused by a variety of factors, according to Radiopaedia, such as benign and malignant neoplasms, focal nodular hyperplasia, focal fatty infiltration, benign epithelial cysts, cysts caused by liver disease and infection, pyogenic abscesses, fungal abscesses, amoebic abscesses, vascular infarctions, lacerations, old ...
Depending on the amount of X-ray which passed through, the computer program will calculate and reconstruct the image of the tissue. The amount of X-ray which used in CT scan is much higher and it may cause the side effects. If CT is repeatedly taken, it may cause cancer. The CT scan gives the axial view of the tissue. So the films are usually two dimensional. Now there are three dimensional film reconstruction facilities available in CT also.