A device for detecting spatial differences in fluid level changes in a tissue of a patient may include a support structure for securing the device to a body part of the patient, a processing element operably connected to the support structure, a wireless networking interface operably connected to the support structure and in communication with the processing element and an external computing device via a network, a first transmission module operably connected to the support structure and in communication with the processing element, a second transmission module and a third transmission module operably connected to the support structure and in communication with the processing element. When activated, the first transmission module transmits a first time varying magnetic field through the tissue of the patient. The second and third transmission modules, which are spatially separated from one another, receive first and second versions, respectively, of the first time varying magnetic field.

This invention is a head-worn device (e.g. headband, halo, or headset) with sensors (e.g. electrodes) which record brain activity. In an example, the device can be undulating with concave undulations which rest on the tops of a person's ears. In an example, the device can further comprise right side and left side ear prongs (e.g. arms, segments, or portions) which curve around the posterior and upper surfaces of a person's right and left ears.

This invention is a head-worn device (e.g. headband, halo, or headset) with sensors (e.g. electrodes) which record brain activity. In an example, the device can be undulating with concave undulations which rest on the tops of a person's ears. In an example, the device can further comprise right side and left side ear prongs (e.g. arms, segments, or portions) which curve around the posterior and upper surfaces of a person's right and left ears.

Devices and systems as described herein is configured to sense a signal, such as a signal from an individual. In some embodiments, a signal is a magnetic field. In some embodiments, a source of a signal is an individual's organ, such as a heart muscle. A device or system, in some embodiments, comprises one or more sensors, such as an array of sensors configured to sense the signal. A device or system, in some embodiments, comprises a shield or portion thereof to reduce noise and enhance signal collection.

Devices and systems as described herein is configured to sense a signal, such as a signal from an individual. In some embodiments, a signal is a magnetic field. In some embodiments, a source of a signal is an individual's organ, such as a heart muscle. A device or system, in some embodiments, comprises one or more sensors, such as an array of sensors configured to sense the signal. A device or system, in some embodiments, comprises a shield or portion thereof to reduce noise and enhance signal collection.

This document discusses, among other things, systems and methods for managing pain of a subject. A system includes one or more physiological sensors configured to sense a physiological signal indicative of patient brain activity. The physiological signals may include an electroencephalography signal, a magnetoencephalography signal, or a brain-evoked potential. The system may extract from the brain activity signal one or more signal metrics indicative of strength or pattern of brain electromagnetic activity associated with pain, and generate a pain score using the one or more signal metrics. The pain score can be output to a patient or a process. The system may select an electrode configuration for pain-relief electrostimulation based on the pain score, and deliver a closed-loop pain therapy according to the selected electrode configuration.

The invention relates to a method of localisation of vector magnetometers arranged in a network, comprising the following steps: generation (EMi), by a magnetic field source (S), of m reference magnetic fields with known amplitudes and known and distinct directions; measurement (MESj) of the m reference magnetic fields along n axes of magnetometers in the network, m and n being such that m*n6; determination (LOCj) of the position and orientation of magnetometers of the network from said measurements, relative to the magnetic field source.

The invention also includes a magnetic field measurement instrument that includes a network of vector magnetometers and is capable of implementing the localisation method.

Application to the imagery of biomagnetic fields, for example in magnetocardiography or in magnetoencephalography.

The reconstruction of the current dipole sources in a portion of a body, such as a heart, from measured magnetic field data on a same plane near the heart is accomplished here.

In embodiments, reconstruction of current dipole sources is accomplished by calculating the positions of the possible current dipoles in the heart with respect to the measured data plane and by converting a set of non linear equations to a set of linear equations.

A support device includes: a data acquisition unit which acquires brain activity data of a user; a stimulation unit which gives an electromagnetic stimulus corresponding to the brain activity data, to a head of the user; and a brain wave storage unit which stores a change in the brain activity data. The support device is configured to give an electromagnetic stimulus which causes alpha waves of the brain activity data to change, when acquiring the brain activity data.

The present invention introduces a method, apparatus and computer program for magnetic resonance imaging or magnetoencephalography applications in order to control currents of a coil assembly (20), and thus achieving desired magnetic fields precisely in the measuring volume (21). The approach is an algebraic method where a field vector is generated for the test currents of each coil (20). Vector and matrix algebra is applied and a linear set of equations is formed. Field components and their derivatives up to the desired order can be taken into account. Principal component analysis or independent component analysis can be applied for determination of the dominant external interference components. By checking the condition value for the matrix (33, 45), it is possible to investigate whether a reasonable solution of currents for desired magnetic fields is possible to achieve. Finally, solved currents can be installed into a current supply unit (29) feeding the coils of the assembly (20). The invention can be applied as an active compensation feature for different interference shapes in the MEG application (25), or for the precise creation of the fields and gradients in the MRI application (24).