OLIVER, J. H. Hypervascular liver metastasis : do unenhanced and hepatic arterial phase CT images affect tumor detection?. Radiology. 1997, 205, 709-715
NAZARIAN, L. N. Size of colorectal liver metastasis at abdominal CT : comparison of precontrast and postcontrast studies. Radiology. 1999, 213, 825-830
PARK, J. H. Comparison of unenhanced and contrast enhanced spiral CT for assessing interval change in patients with colorectal liver metastases. Acta Radiol. 2001, 8, 696-704