Cerebrovascular reactivity measurements using simultaneous 15O-water PET and ASL MRI: Impacts of arterial transit time, labeling efficiency, and hematocrit. - Moss Y. Zhao; Audrey P. Fan; David Yen-Ting Chen; Magdalena J. Sokolska; Jia Guo; Yosuke Ishii; David D. Shin; Mohammad Mehdi Khalighi; Dawn Holley; Kim Halbert; Andrea Otte; Brittney Williams; et al. (NeuroImage, 2021)