Yasuo Takatsu^1,2, Masafumi Nakamura³, Satoshi Kobayashi⁴, and Tosiaki Miyati^4
1Department of Radiological Technology, Faculty of Health and Welfare, Tokushima Bunri University, Sanuki-city, Japan, ²Department of System Control Engineering, Graduate School of Engineering, Tokushima Bunri University, Sanuki-city, Japan, ³Department of Radiology, Otsu City Hospital, Otsu, Japan, ⁴Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan

The hepatobiliary phase image using Gd–EOB–DTPA in the liver MRI is assessed by the quantitative liver–spleen contrast ratio (Q-LSC) , the cutoff value at which tumors can be easily determined is 1.5. However, Q-LSC is found unsuitable for cases of splenectomy and when there is splenic deposition of Gamna–Gandy bodies. Therefore, the quantitative liver-portal vein contrast ratio (Q-LPC) is useful instead of Q-LSC. The cutoff value of Q-LPC was at 1.462, the sensitivity and the specificity were higher than Q-LSC at the cutoff value. Q-LPC cutoff value can be used for hepatobiliary phase MR image evaluation.