A light source unit irradiates a gas cell disposed in a measurement region with linearly polarized light in which the direction of travel is a z-axis direction and the vibration direction of an electric field is a y-axis direction. A polarimeter detects optical characteristics of light passing through the gas cell. A magnetic field generator applies an artificial magnetic field, capable of varying an x-axis component, a y-axis component, and a z-axis component, to the measurement region. A calculation control unit generates a plurality of artificial magnetic fields, calculates a magnetization value or a value corresponding to the magnetization value on the basis of the detection results of the polarimeter, and calculates an original magnetic field present in the measurement region, using an artificial magnetic field when the magnetization value or the value corresponding to the magnetization value satisfies a condition for external value.

A system to generate a representation of a rhythm disorder includes a plurality of sensors disposed at multiple locations spatially in relation to the heart, wherein cardiac information signals are sensed. A processor receives and analyzes the activation onsets of the cardiac information signals to determine an arrangement of activation onsets. A representation that indicates the clinical source of the rhythm disorder is generated based on the arrangement of the activation onsets.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for tracking fiber optic shaping. In some implementations, a server obtains optical signals reflected through a fiber, the fiber comprising one or more embedded sensors and a nano-magnetometer embedded at a distal location of the fiber. The server determines a frequency shift of each of the reflected optical signals, the frequency shift imparted on the reflected optical signals by the one or more embedded sensors. The server determines a phase shift of each of the reflected optical signals, the phase shift imparted on the reflected optical signals by the nano-magnetometer. The server determines characteristics of the fiber using the determined frequency and the phase shift of each of the reflected optical signals, the characteristics comprises a shape of the fiber and a location of the fiber in relation to an external reference.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for tracking fiber optic shaping. In some implementations, a server obtains optical signals reflected through a fiber, the fiber comprising one or more embedded sensors and a nano-magnetometer embedded at a distal location of the fiber. The server determines a frequency shift of each of the reflected optical signals, the frequency shift imparted on the reflected optical signals by the one or more embedded sensors. The server determines a phase shift of each of the reflected optical signals, the phase shift imparted on the reflected optical signals by the nano-magnetometer. The server determines characteristics of the fiber using the determined frequency and the phase shift of each of the reflected optical signals, the characteristics comprises a shape of the fiber and a location of the fiber in relation to an external reference.

A biological signal analyzing apparatus includes an acquisition unit, a detection unit, and a search unit. The acquisition unit is configured to acquire waveform data of biological signals measured by a plurality of sensors. The detection unit is configured to detect a time at which characteristic waveform information about an interictal epileptiform discharge (IED) appears in the waveform data acquired by the acquisition unit. The search unit is configured to search for an onset time at which a signal is generated from a lesion in a brain within a predetermined search range based on the time detected by the detection unit in the waveform data.

A biological signal analyzing apparatus includes an acquisition unit, a detection unit, and a search unit. The acquisition unit is configured to acquire waveform data of biological signals measured by a plurality of sensors. The detection unit is configured to detect a time at which characteristic waveform information about an interictal epileptiform discharge (IED) appears in the waveform data acquired by the acquisition unit. The search unit is configured to search for an onset time at which a signal is generated from a lesion in a brain within a predetermined search range based on the time detected by the detection unit in the waveform data.

A medical apparatus configured to generate, without multiple electrodes, a signal corresponding to electrical impulses of a heart, and to display a waveform of that signal, comprising: a pulse unit comprising sensor(s) for receiving a single channel pulse signal waveform from a live tissue and for generating a digital pulse signal; a memory buffer; one or more processors configured to constantly apply a derivative function to the digital pulse signal and initiate a display signal to display a waveform of the derivative function during a period of time, wherein the waveform of the derivative function has a shape of an ECG signal waveform of the subject taken during the period of time, wherein the derivative function includes P(t)/t, wherein P represents the pulse signal waveform and t is a time variable; and a digital display or printer device configured to display or print the waveform. Multiple channel embodiment also included.

In one embodiment, a first magnetoresistive effect element, a current supply unit and a detecting unit is provided. The first magnetoresistive effect element is provided between first and second electrodes and along a first direction which is a current flowing direction between the first and the second electrode. The first magnetoresistive effect element includes first and second magnetic layers and a first intermediate layer provided between the first and the second magnetic layer and along the first direction and a second direction orthogonal to the first direction. The current supply unit is connected to the first and the second electrode and can supply an alternating current. The detecting unit detects a second harmonic component of an alternating current voltage signal outputted from the first magnetoresistive effect element. A length of the first magnetoresistive effect element in the first direction is larger than a length in the second direction.

Some embodiments described herein relate to a method that includes defining an electro-anatomical model of a heart. The electro-anatomical model can include conduction patterns for multiple patterns or phases identified by a measurement instrument. The electro-anatomical model can also include a voltage map of the heart. A portion of the heart containing a rotor can be identified based on circulation in one phase of the model. The rotor can be determined to be stable based on that portion of the heart having circulation in another phase of the model. The rotor can be characterized as a substrate rotor based on the rotor being stable and based on the voltage or a change in voltage at the portion of the heart containing the rotor. The rotor can be treated or ablated when the rotor is determined to be a substrate rotor.

Described is a low voltage, pulsed electrical stimulation device for controlling expression of, for example, follistatin, a muscle formation promotion protein, by tissues. Epicardial stimulation is especially useful for heart treatment. Follistatin controlled release is also useful for treating other ailments, such as erectile dysfunction, aortic aneurysm, and failing heart valves.