Embodiments of the present invention provide a motion tracking method for MR imaging, comprising: exciting an imaging volume of a detected object; shifting a frequency of an FID signal generated by the imaging volume relative to a center frequency as a position of the imaging volume changes; acquiring the FID signal and calculating a frequency shift of the acquired FID signal relative to the center frequency for multiple times; and obtaining a motion trajectory of the detected object in accordance with a change of the frequency shift as a function of time.

An ODMR member is arranged in a measurement target AC magnetic field. A coil applies a magnetic field of a microwave to the ODMR member. A high frequency power supply causes the coil to conduct a current of the microwave. An irradiating device irradiates the ODMR member with light. A light receiving device detects light that the ODMR member emits. A measurement control unit performs a predetermined DC magnetic field measurement sequence at a predetermined phase of the measurement target AC magnetic field, and in the DC magnetic field measurement sequence, controls the high frequency power supply and the irradiating device and thereby determines a detection light intensity of the light detected by the light receiving device. A magnetic field calculation unit calculates an intensity of the measurement target AC magnetic field on the basis of the predetermined phase and the detection light intensity.

A magnetometer includes a sample signal device; a reference signal device; a microwave field generator operable to apply a microwave field to the sample signal device and the reference signal device; an optical source configured to emit light including light of a first wavelength that interacts optically with the sample signal device and with the reference signal device; at least one photodetector arranged to detect a sample photoluminescence signal including light of a second wavelength emitted from the sample signal device and a reference photoluminescence signal including light of the second wavelength emitted from the reference signal device, in which the first wavelength is different from the second wavelength; and a magnet arranged adjacent to the sample signal device and the reference signal device.

Certain aspects of the present disclosure provide methods and apparatus for closed-loop control of a system using one or more electron paramagnetic resonance (EPR) sensors located on-site. With such EPR sensors, a change can be applied to the system, the EPR sensors can measure the effect(s) of the change, and then adjustments can be made in real-time. This feedback process may be repeated continuously to control the system.

Certain aspects of the present disclosure provide methods and apparatus for closed-loop control of a system using one or more electron paramagnetic resonance (EPR) sensors located on-site. With such EPR sensors, a change can be applied to the system, the EPR sensors can measure the effect(s) of the change, and then adjustments can be made in real-time. This feedback process may be repeated continuously to control the system.

A device for generating and detecting a magnetization of a sample includes a magnetic field generator configured to generate a static magnetic field of a predetermined direction and strength at a sample location, a transmitter configured to provide an additional magnetic field at the sample location, and a receiver configured to detect a magnetization of the sample. An assembly of at least two LC oscillators, the oscillation frequency of which is a function of a value of an inductive element of the LC oscillators and which are frequency-synchronized via a wiring, and forced by a control voltage to have a same oscillation frequency, is used as the receiver and/or the transmitter. A controller configured to control the assembly is connected, the assembly and the controller are configured to generate a magnetic field capable of deflecting a magnetization of the sample out of equilibrium.

A device for generating and detecting a magnetization of a sample includes a magnetic field generator configured to generate a static magnetic field of a predetermined direction and strength at a sample location, a transmitter configured to provide an additional magnetic field at the sample location, and a receiver configured to detect a magnetization of the sample. An assembly of at least two LC oscillators, the oscillation frequency of which is a function of a value of an inductive element of the LC oscillators and which are frequency-synchronized via a wiring, and forced by a control voltage to have a same oscillation frequency, is used as the receiver and/or the transmitter. A controller configured to control the assembly is connected, the assembly and the controller are configured to generate a magnetic field capable of deflecting a magnetization of the sample out of equilibrium.

Technologies relating to a magnetic resonance spectrometer are disclosed. The magnetic resonance spectrometer may include a doped nanostructured crystal. By nanostructuring the surface of the crystal, the sensor-sample contact area of the crystal can be increased. As a result of the increased sensor-sample contact area, the output fluorescence signal emitted from the crystal is also increased, with corresponding reductions in measurement acquisition time and requisite sample volumes.

Technologies relating to a magnetic resonance spectrometer are disclosed. The magnetic resonance spectrometer may include a doped nanostructured crystal. By nanostructuring the surface of the crystal, the sensor-sample contact area of the crystal can be increased. As a result of the increased sensor-sample contact area, the output fluorescence signal emitted from the crystal is also increased, with corresponding reductions in measurement acquisition time and requisite sample volumes.

A biometric method includes: a step (1) for administering, to a target organism from the outside thereof, one of (i) a target molecule A having both an unpaired electron and a magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of .sup.19F, and (ii) a target molecule B and a radical molecule C, the target molecule B having no unpaired electron, and further having a magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of .sup.19F, the radical molecule C having an unpaired electron; and a step (2) for causing electron spin resonance in the unpaired electron of the target molecule A or the radical molecule C by irradiating electromagnetic waves to the target organism, subsequently triggering nuclear magnetic resonance in the magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of .sup.19F in one of the target molecule A and the target molecule B, and further, measuring nuclear magnetic resonance signals. The step (2) is carried out in a magnetic field having such an intensity that the nuclear magnetic resonance signals of the magnetic resonance nucleus in one of the target molecule A and the target molecule B are degenerated, the magnetic resonance nucleus having a gyromagnetic ratio smaller than the same of .sup.19F. The biometric method makes it possible to measure low-sensitivity magnetic resonance nucleus such as .sup.13C, .sup.15N, and .sup.31P, which are important nuclides present in organism, with performance equal to or over that of a high-field MRI device.