1. A method for generating a report regarding elasticity of arteries in a brain of a subject, the method comprising: illuminating a region of interest (ROI) in the brain with light emitted by at least one light source in an optical imaging system; registering the emitted light that has interacted with the ROI with at least one optical detector, the at least one detector producing an output containing interaction data that represents interaction between the emitted light and the ROI; determining, from the obtained interaction data, a shape parameter of a hemodynamic pulse propagating through the ROI; correlating the shape parameter of a hemodynamic pulse to an elasticity parameter of arteries in the brain; generating a report indicating the elasticity parameter.