You believe the woman is having an acute stroke and it is likely ischemic. You assess airway, breathing, and circulation. She is breathing normally with mild tachycardia (105 bpm) and good oxygen saturation (96% on room air). What diagnostic test should be done that can be performed at the bedside?
a) Magnetic resonance imaging (MRI)
b) Computed tomography (CT) scan
c) Carotid ultrasound
d) Electroencephalogram (EEG)