A satellite-based communications system operating at high data rates includes a plurality of communications satellites each having an uplink and a downlink antenna for receiving and transmitting a plurality of spot beams which may be fixed or scanned. The method is particularly useful for identifying individuals that are at risk for stroke, and for diagnosing stroke in an emergency room setting. The invention provides an efficient means of putting this energy reserve to practical use. A flap defined on an inner face of the shell interior supports a fabric material is contained within the shell.