Venous phase of computed tomography angiography increases spot sign detection, but intracerebral hemorrhage expansion is greater in spot signs detected in arterial phase

David Rodriguez-Luna, Dar Dowlatshahi, Richard I. Aviv, Carlos A. Molina, Yolanda Silva, Imanuel Dzialowski, Cheemun Lum, Anna Czlonkowska, Jean Martin Boulanger, Carlos S. Kase, Gord Gubitz, Rohit Bhatia, Vasantha Padma, Jayanta Roy, Teri Stewart, Thien J. Huynh, Michael D. Hill, Andrew M. Demchuk