A method for detecting evidence of a stroke in a patient may involve securing a volumetric integral phase-shift spectroscopy (VIPS) device to the patient's head, transmitting a first signal from a first transmitter of the VIPS device through a left hemisphere of the patient's brain to a receiver of the VIPS device, transmitting a second signal from a second transmitter of the VIPS device through a right hemisphere of the patient's brain to the receiver, and detecting the evidence of the stroke, with the VIPS device.
Differentiation of fluid volume change