30 results about "Magnetic field imaging" patented technology

The present invention provides markers and methods of using markers to identify or treat anatomical sites in a variety of medical processes, procedures and treatments. The markers of embodiments of the present invention are permanently implantable, and are detectable in and compatible with images formed by at least two imaging modalities, wherein one of the imaging modalities is a magnetic field imaging modality. Images of anatomical sites marked according to embodiments of the present invention may be formed using various imaging modalities to provide information about the anatomical sites.

Circuit flaws in microelectronic circuitry present regions of high resistance in which a current distribution deviates from that of a defect-free circuit. The altered current distribution emits a correspondingly altered magnetic field in accordance with Ampere's Law. When compared with the magnetic field of a defect-free circuit, the anomaly in the magnetic field of the defective device is detected and the location of the circuit flaw may be determined therefrom. As the anomaly in the magnetic field is very small in magnitude, a sensitive magnetic microscope is utilized to obtain images of the magnetic fields of a defect-free reference device and a device-under-test. The distance between the magnetic sensor and the devices being scanned is precisely controlled to minimize influences of scanning distance on the difference in measured magnetic field strength. Comparative image analysis reveals the location of the circuit flaw. Maximal image registration through image interpolation, displacement and resampling optimizes the comparative image analysis.

A parallel magnetic resonance imaging (MRI) apparatus configurable to image a physical entity comprises: a main magnetic flux source for providing a uniform fixed magnetic field, Balpha; an RF array system comprising a plurality of RF coils and receivers, said RF system configured for: generating rotating RF excitation magnetic fields B1; and receiving RF signals due to precessing nuclear magnetization on multiple spatially distinct radio frequency coils and associated receiver channels, said RF system being configured to operate in accordance with a B1 sensitivity encoding technique; a control processor for controlling imaging functionality, collecting image data and effecting data processing of the captured image data the control processor being configured with post processing capability for the B1 sensitivity encoding technique; an image display means for displaying processed image data as resultant images; and an auxiliary magnetic field means capable of producing at least one auxiliary uniform Bo step magnetic field imaging region within the main B0 magnetic field; wherein: the auxiliary magnetic field, means is configured to operate in combination with the RF coil system and the B1 sensitivity encoding technique, the imaging apparatus thereby providing faster image acquisition than that attributed to the speed up factor provided solely by the B1 sensitivity encoding technique. The invention also includes a method of imaging using this apparatus. Furthermore, the invention also includes a method and apparatus for three-dimensional MR imaging using a 1D Multiple Acquisition Micro Bo array coupled with a 2D Multiple Acquisition Micro Bo array.

The invention provides various systems, machine readable programs and methods for performing imaging using a MR scanner. The MR scanner includes at least one local radio-frequency transmit coil and at least one local gradient coil. The local radio-frequency transmit coil(s) and local gradient coil(s) cooperate to define an imaging volume. The MR scanner further includes a control system for performing an imaging operation on a patient's anatomy disposed within the imaging volume. The control system permits a selective simultaneous increase of the gradient magnetic field strength and peak B1 field strength by substantially the same factor, f.

The invention discloses a chip-level diamond NV-color center magnetic imaging device and method, and the method achieves the hyperfine magnetic field imaging of the two-dimensional surface of an object, such as a magnetic image of a biological cell. The method comprises the steps: carrying out the polarization of a laser pulse and a microwave pulse; generating fluorescent light generated at the NV-color center of a diamond in an external magnetic field; employing the laser pulse to generate fluorescent light again, wherein the difference result of fluorescent light of two times can reflect the magnetic field intensity of the NV-color center, thereby achieving the conversion of magnetic field information to optical information; and employing a nano-level convex lens group and a distributed optical imaging unit to convert an optical signal into an electric signal. The invention also relates to a packaging method for enabling a whole system to be packaged in a manner of chip level, and the method comprises temperature control and electromagnetic shielding. The method is great in value in the fields of biomedical research and medical diagnosis.

The present invention discloses a novel magnetic sensor device performing direct magnetic field imaging, comprising a probe having a conical tip portion which is configured as a sensor having two superconductors separated by a thin non-superconducting layer (such as a Josephson junction based sensor), where the non-superconducting layer is located at the apex portion of said conical tip, thereby defining electron tunneling region(s) at said apex portion. The technique of the present invention enables the sensor device to be very small and to be brought very close to the sample surface.

The invention relates to a medical magnetic resonance imager monohedral magnet device, belonging to the technical field of medical instruments. The invention comprises a main monohedral magnet, a first gradient coil, a second gradient coil, an imaging zone and a bracket, wherein, the main monohedral magnet comprises a first main magnetic pole, a second main magnetic pole, a first adjusting magnetic pole, a second adjusting magnetic pole, a first pole surface, a second pole surface and a base. The invention has the following advantages: the main monohedral magnet forms an even lamelliform magnetic field imaging zone on the outer side of the magnet; a first monoplane gradient coil and a second monoplane gradient coil provide a gradient magnetic field with favourable degree of linearity in the imaging zone so as to realize phase encoding and frequency encoding of images; by revising the incline angle of a polar surface and adjusting magnetic pole interval, an even amelliform magnetic field can be precisely built. Compared with the traditional magnetic resonance imager magnet device, the device of the invention has the advantages of small volume, light weight and good openness, and greatly lowers the cost of the magnetic resonance imager.

The invention relates to an atom magnetometer and a magnetic field imaging system. First wavelength laser and second wavelength laser are formed through a laser light source and a frequency doubling module. The optical power of the first wavelength laser is adjusted through an optical attenuation module, non-magneto-optical heating of an atomic gas chamber is achieved, and the attenuation amount is adjusted for temperature control. And the second wavelength laser enters the atomic gas chamber to realize magnetic field detection. Therefore, an atom magnetometer can realize non-magnetic heatingand atom pumping detection without coupling of heating laser and pumping laser, and the complexity of an optical path is reduced. And one laser light source in a magnetic field imaging system is connected with a plurality of atom magnetometer probes. Through the position information of the plurality of atom magnetometer probes and the detected magnetic field information, accurate positioning of the magnetic field position can be realized so as to realize multidimensional magnetic field space reconstruction.

A microcosmic electrical impedance imaging device based on a diamond NV color center comprises a magnetic field imaging module adopting a diamond ensemble NV as a weak magnetic field detector; a microwave radiation structure module which adopts an omega-shaped radiation structure as a microwave antenna to radiate a microwave magnetic field to the diamond NV color center; a microelectrode module which is used for injecting alternating current into the buffer solution by adopting a cross-shaped iridium-iridium oxide metal electrode with two pairs of electrode arms. According to the invention, the spatial resolution of the existing magnetic resonance electrical impedance imaging is expanded, and the spatial resolution of the electrical impedance imaging is improved to a micron scale to a submicron scale, so an electrical impedance imaging method on a microcosmic scale is realized, and the method is suitable for conductivity imaging of a cell biological sample.

The invention discloses a near-bit magnetic field imaging positioning measuring instrument and a working method, and belongs to the technical field of oil drilling measurement. The near-bit magnetic field imaging positioning measuring instrument comprises a drill bit, a near-bit magnetic field imaging positioning short section, a power drilling tool, a wireless short pass transmitting assembly, awireless short pass receiving assembly, a ground receiving device and a processing computer. A non-magnetic drill bit and a non-magnetic near-bit magnetic field imaging positioning short section are adopted to form a stable magnetic anomaly detection environment nearby the drill bit, a magnetic field acquisition sensor can perform three-dimensional detection on a three-dimensional space nearby thedrill bit during rotation, the positions of anomalous fields can be accurately measured, and range information is given; and a ground computer visually displays the anomalous fields in front of the drill bit in real time on a screen according to the measured information, the interaction position of nearby sleeves and the drill bit can further be identified, and collision early warning and suggestions on pile wrapping are made.

The present invention discloses a sensor device comprising a probe carrying a three-dimensional magnetic field sensor. The probe has a conical tip portion with an edge being configured as the three-dimensional magnetic field sensor. The sensor at the edge of the tip comprises at least three Josephson junctions, each junction being formed of a superconducting layer interrupted by a barrier. The barrier comprises a non-superconducting layer or a geometrical constriction. The conical tip portion of the probe forms a tapered three-dimensional structure having at least one arc-like part crossing the opening of the tip portion such that the apex has a closed-loop basis and a plurality of complimentary spaced-apart facets defined by the at least one arc, thereby enabling measurement of both in-plane and out-of-plane magnetic fields separately.

A nuclear magnetic resonance (NMR) fringe magnetic field imaging experimental device relates to NMR imaging. The device comprises a servo motor, a voice coil motor, a coarse adjustment non-magnetic lifting platform, a fine adjustment non-magnetic lifting platform, a NMR fringe magnetic field imaging probe, a sample chamber, a probe coil and sample relative-mobile/static conversion pin, a coarse adjustment and fine adjustment non-magnetic lifting platform grating ruler, and a control system. The control system is composed of a principal computer, a PMAC controller, a servo motor driver, and a voice coil motor controller. A coarse adjustment and fine adjustment two-stage lifting high-precision mechanical structure and an advanced closed-loop control algorithm are combined to realize high-precision sample movement with the highest precision of 1micron and complete high-precision and high-resolution NMR fringe magnetic field imaging. Two experimental methods, namely, probe coil and sample relative-mobile imaging and probe coil and sample relative-static imaging, can be completed on one experimental device without the need for any secondary transformation, and that a strong magnetic environment is not affected is guaranteed to the maximum. Closed-loop control makes sample displacement more precise and the result more accurate.