A device for detecting spatial differences in fluid level changes in a head of a patient, the device comprising: a headset (129; 906) for securing the device to the head of the patient, wherein the headset comprises a stabilizer (800; 912) that wraps around the head; a processing element (104; 904) integrated into the headset; a wireless networking interface operably connected to the headset and in communication with the processing element and an external computing device via a wireless network; a first transmission module (120; 124) operably connected to the headset and in communication with the processing element (104; 904); a second transmission module (120; 124) operably connected to the headset and in communication with the processing element; a third transmission module (120; 124) operably connected to the headset and in communication with the processing element (104; 904); at least one sensor on the headset configured to monitor a placement of the headset on the head during a measurement of the spatial differences in fluid level changes in the head, wherein the sensor is configured to send a signal to the processing element which is configured to inform the user to correct the headset placement and/or to identify the measured data as non-ideal due to placement, wherein the first transmission (120; 124) module is opposed to the second and third transmission modules (120; 124) and when activated transmits a first time varying magnetic field through the tissue of the patient, wherein the second transmission module and the third transmission module are spatially separated from one another and receive first and second versions of the first magnetic field transmitted by the first transmission module and transmit a first received magnetic field data to the processing element, and wherein the processing element (104; 904) provides transmission data corresponding to the first received magnetic field data to the wireless networking interface, which in turn transmits the transmission data wirelessly to the external computing device. a headset (129; 906) for securing the device to the head of the patient, wherein the headset comprises a stabilizer (800; 912) that wraps around the head; a processing element (104; 904) integrated into the headset; a wireless networking interface operably connected to the headset and in communication with the processing element and an external computing device via a wireless network; a first transmission module (120; 124) operably connected to the headset and in communication with the processing element (104; 904); a second transmission module (120; 124) operably connected to the headset and in communication with the processing element; a third transmission module (120; 124) operably connected to the headset and in communication with the processing element (104; 904); at least one sensor on the headset configured to monitor a placement of the headset on the head during a measurement of the spatial differences in fluid level changes in the head, wherein the sensor is configured to send a signal to the processing element which is configured to inform the user to correct the headset placement and/or to identify the measured data as non-ideal due to placement, wherein the first transmission (120; 124) module is opposed to the second and third transmission modules (120; 124) and when activated transmits a first time varying magnetic field through the tissue of the patient, wherein the second transmission module and the third transmission module are spatially separated from one another and receive first and second versions of the first magnetic field transmitted by the first transmission module and transmit a first received magnetic field data to the processing element, and wherein the processing element (104; 904) provides transmission data corresponding to the first received magnetic field data to the wireless networking interface, which in turn transmits the transmission data wirelessly to the external computing device.