@article{oai:air.repo.nii.ac.jp:00005310,
 author = {Sasajima, Motoko and Ishiyama, Koichi and Otani, Takahiro and Koga, Makoto and Sugawara, Makoto and Tozawa, Tomoki and Hatakeyama, Kento and Hashimoto, Manabu},
 issue = {3/4},
 journal = {秋田医学},
 month = {Mar},
 note = {Purpose : We aimed to evaluate the differences between true unenhanced (TUE) and virtual unenhanced (VUE) computed tomography (CT) performed by contrast-enhanced CT with dualenergy CT in the assessment of liver metastases that were difficult to visually identify with contrast- enhanced CT. Materials and methods : Between April 2018 and September 2019, we identified 266 patients with liver metastases who underwent unenhanced and contrast-enhanced CT with dual-energy CT at our institution, and enrolled 43 liver metastases in 19 patients (7.1%) that were indistinct on contrast-enhanced CT.　Mean CT attenuation values for liver metastases and liver parenchyma were measured, and differences between the CT attenuation values for liver metastases and liver parenchyma were analyzed using VUE CT and TUE CT. Results : The mean CT attenuation values for liver metastases and liver parenchyma in VUE CT versus TUE CT were 51.0 vs. 41.0 HU (p<0.001) and 58.2 HU vs. 61.2 HU (p=0.027), respectively.　The differences in CT attenuation values between liver metastases and liver parenchyma were 10.1 HU on VUE CT vs. 19.3 HU on TUE CT (p<0.001). Conclusion : The contrast between lesions and liver parenchyma on VUE CT was significantly lower than that on TUE CT.　VUE CT cannot currently replace TUE CT.},
 pages = {105--111},
 title = {COMPARISON OF VIRTUAL UNENHANCED AND TRUE UNENHANCED ATTENUATION VALUES BY DUAL-ENERGY CT FOR DETECTING INDISTINCT LIVER METASTASES ON CONTRAST-ENHANCED CT},
 volume = {47},
 year = {2021}
}