A simplified method to quantitatively predict the effect of lenvatinib on hepatocellular carcinoma using contrast-enhanced ultrasound with perfluorobutane microbubbles - Eso, Yuji; Nakano, Shigeharu; Mishima, Masako; Arasawa, Soichi; Iguchi, Eriko; Takeda, Haruhiko; Takai, Atsushi; Takahashi, Ken; Seno, Hiroshi (Quantitative Imaging in Medicine and Surgery, 2021)