Ex Vivo Measurement of Human Blood T 1 at 5 T : Dependence on Hematocrit and Oxygenation - Shuwan Yu; Yuan Dong; Yuxiao Gu; Ne Yang; Lele Ma; Qingyu Xu; Ping Ma; Baoxin Zhou; Shuo Chen; Yonglin Chen; Dengrong Jiang; Xihai Zhao; et al. (Magnetic Resonance in Medicine, 2026)