A magnetism measuring apparatus includes: a sensor array configured to detect magnetic fields generated by a living body; a current source reconfiguration unit configured to reconstruct a current source of a current flowing inside of the living body based on a magnetic field signal obtained from the sensor array. The sensor array includes first sensors configured to detect magnetic field components of many directions and second sensors configured to detect magnetic field components of directions fewer than those of the first sensors.

A biomagnetism measuring device includes a magnetic sensor and a support unit. The magnetic sensor includes a tunnel magneto-resistive element including a fixed magnetic layer, a free magnetic layer and an insulating layer. The insulating layer is disposed between the fixed magnetic layer and the free magnetic layer, and has resistance being changed by a tunnel effect depending on an angle difference between a direction of magnetization of the fixed magnetic layer and a direction of magnetization of the free magnetic layer. The support unit supports the magnetic sensor in such a way that the tunnel magneto-resistive element faces a living body. The magnetic sensor outputs an output signal in accordance with a resistance value of the insulating layer, the resistance value being changed by magnetism emitted from the living body.

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.

Electrical activity propagation along an electrode array within a cardiac chamber is reconstructed. Signals are sampled from the electrode array and the signals are plotted in multi-dimensional space with each axis corresponding to a channel in the electrode array. An excursion direction of global activation in the multi-dimensional space is estimated and a change in vectors of the sampled signals over time is determined. Signals with vectors that change over time in the excursion direction are suppressed.

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 magnetocardiography arrangement for producing stress magnetocardiograms that comprises a magnetocardiograph (1) and a stress unit (2) consisting of non-magnetic components. The magnetocardiograph (1) and the stress unit (2) are arranged in a shielded chamber (4) for shielding against external magnetic fields, and the stress unit (2) is or includes a bicycle ergometer braked by means of pressurized gas or a pressurized gas mixture from a source (6) for the pressurized gas or the pressurized gas mixture arranged outside the shielded chamber (4).

A gas cell includes a cell main body having a first chamber defined by an inner wall, and a first paraffin film provided on the inner wall, wherein in the first chamber, a gas which interacts with an electromagnetic wave is stored, the first paraffin film is a pure paraffin film, and a paraffin constituting the first paraffin film is arranged such that the directions of the molecular axes are aligned.

A magnetic sensor includes a light flux emitting unit, a first cell onto which a light flux, which propagates in a first direction, is incident and that accommodates a medium which changes optical characteristics of the light flux depending on a magnitude of a magnetic field, a first light flux bender that bends some of the plurality of light fluxes in a second direction different from the first direction, a second cell onto which the light flux, which is bent in the second direction in the first light flux bender, is incident and that accommodates a medium which changes optical characteristics of the light flux depending on the magnitude of the magnetic field, a first light detection element that detects optical characteristics of the light flux emitted from the first cell, and a second light detection element that detects optical characteristics of the light flux emitted from the second cell.