Detection and analysis of spatially varying fluid levels using magnetic signals

A device for detecting a spatial difference in fluid in a head of a patient, the device comprising:

• a headset for securing the device to the patient's head;
• a first transmitter attached to the headset at a first location so that the first transmitter resides on a first side of the patient's head when the headset is placed on the patient, closer to a back of the head than to a front of the head, wherein the first transmitter is configured to transmit a first time varying magnetic field at a first frequency through a first hemisphere of the patient's brain;
• a second transmitter attached to the headset opposite the first transmitter at a second location so that the second transmitter resides on a second side of the patient's head when the headset is placed on the patient, closer to the back of the head than to a front of the head, wherein the second transmitter is configured to transmit a second time varying magnetic field at a second frequency that is different than the first frequency through a second hemisphere of the patient's brain;
• a receiver attached to the headset apart from the first transmitter and the second transmitter, at a third location so that the receiver resides on the patient's forehead when the headset is placed on the patient, such that when the headset is placed on the patient's head, radiofrequency signals passing from the first transmitter to the receiver pass through a first hemisphere of the patient's brain, and radiofrequency signals passing from the second transmitter to the receiver pass through a second hemisphere of the patient's brain;
• a processing element in the headset configured to process received magnetic field data from the receiver, distinguish first received signals received by the receiver from the first transmitter versus second received signals received by the receiver from the second transmitter based on a difference between the first frequency and the second frequency, and detect a spatial difference between fluid in the first hemisphere and the second hemisphere based on a difference in phase shifts of the first time varying magnetic field and the second time varying magnetic field;
• and
• a wireless networking interface in the headset and in communication with the processing element and an external computing device via a wireless network.