1. A method comprising: acquiring magnetic resonance data associated with an area of interest of a subject, wherein the area of interest corresponds to at least one physiological activity of the subject and the acquiring comprises receiving data associated with arterial spin labeling (ASL) of the area of interest of the subject; performing image reconstruction, comprising compressed sensing reconstruction, on at least a portion of the acquired magnetic resonance data; and determining at least one characteristic of the physiological activity in the area of interest of the subject based on the acquired magnetic resonance data.