In a magnetic field source detecting apparatus, a magnetic sensor unit detects an intensity and a direction of a measurement target magnetic field on or over a surface of a test target object; and a position estimating unit estimates a position in a depth direction of a magnetic field source that exists at an unspecified position inside a test target object on the basis of the intensities and the directions of the measurement target magnetic field detected by the magnetic sensor at at least two 2-dimensional positions of the surface.

An MRI apparatus equipped with a magnetic shield structure to reduce flux leakage. The MRI apparatus includes: a pair of static magnetic magnets that are disposed on opposite sides of an imaging space; and a pair of gradient coils that are disposed on opposite sides of the imaging space. Each static magnetic magnet has a disk-shaped magnetic material pole 201 and a ring-shaped magnetic material pole 202. Each gradient coil has a first coil 204 that applies a magnetic field gradient in a Z axis direction in an imaging region, and a laminate 301 that shields the disk-shaped magnetic material pole from magnetic flux produced in the first coil. The laminate has a smaller thickness in the Z axis direction on the ring-shaped magnetic material pole side than that in a center portion of the imaging space. A vertical lowest portion of a laminate end portion on the ring-shaped magnetic material pole side of the laminate is in a higher position than a position of a lowest portion of a laminate central portion on the imaging region side of the laminate.

Tools and methods are used to determine the oil, water, and solids volume fractions in a drilling fluid at the rig site. The volume fractions can be determined in-line with returned drilling fluid by using an NMR magnet and a flow line or sample chamber that receives a fluid sample and loads it into the NMR magnet. Using an RF probe, spectrometer, and computing device, data processing and interpretation of NMR data from the spectrometer is performed, while also raising a flag when iron contamination exceeds a predefined threshold.

The invention relates to an MRI apparatus and a method of MRI involving the acquisition of a first and a second MRI image with mutually different orientations between the BO magnetic field and the object to be investigated. For instance, when imaging structures such as a tendon, due to the magic angle effect, this results in a change in image contrast. According to the invention, a coregistration can be performed between the first and the second MRI image. Moreover, the orientation of a structure within the object can be determined on the basis of the different orientations and the image intensity in the first and the second MRI image. The invention further discloses an apparatus for carrying out the method and a method of shimming the BO magnetic field of the apparatus.

The invention relates to an MRI apparatus and a method of MRI involving the acquisition of a first and a second MRI image with mutually different orientations between the BO magnetic field and the object to be investigated. For instance, when imaging structures such as a tendon, due to the magic angle effect, this results in a change in image contrast. According to the invention, a coregistration can be performed between the first and the second MRI image. Moreover, the orientation of a structure within the object can be determined on the basis of the different orientations and the image intensity in the first and the second MRI image. The invention further discloses an apparatus for carrying out the method and a method of shimming the BO magnetic field of the apparatus.

Magnetic field generating unit 2 is fixed to object 7 that moves relative to magnetic field detecting means 3. Magnetic field generating unit 3 has magnetic field generator 4, first support structure 5 that is fixed to object 7 and second support structure 6 that is independent of first support structure 5. Second support structure 6 is supported by first support structure 5 and supports magnetic field generator 4. For example, second support structure 6 is formed of a nonmagnetic material, and magnetic field generator 4 is arranged away from first support structure 5.

Magnetic field generating unit 2 is fixed to object 7 that moves relative to magnetic field detecting means 3. Magnetic field generating unit 3 has magnetic field generator 4, first support structure 5 that is fixed to object 7 and second support structure 6 that is independent of first support structure 5. Second support structure 6 is supported by first support structure 5 and supports magnetic field generator 4. For example, second support structure 6 is formed of a nonmagnetic material, and magnetic field generator 4 is arranged away from first support structure 5.

Magnetic field generating unit is fixed to object that moves relative to magnetic field detecting means. Magnetic field generating unit has magnetic field generator, first support structure that is fixed to object and second support structure that is independent of first support structure. Second support structure is supported by first support structure and supports magnetic field generator. For example, second support structure is formed of a nonmagnetic material, and magnetic field generator is arranged away from first support structure.

Magnetic field generating unit is fixed to object that moves relative to magnetic field detecting means. Magnetic field generating unit has magnetic field generator, first support structure that is fixed to object and second support structure that is independent of first support structure. Second support structure is supported by first support structure and supports magnetic field generator. For example, second support structure is formed of a nonmagnetic material, and magnetic field generator is arranged away from first support structure.

A magnetic resonance imaging (MRI) apparatus is disclosed. The MRI apparatus includes a plurality of magnetic elements affixed in a Halbach dome structure. The Halbach dome structure defines an access aperture configured to allow access to the patient's head to enable neural intervention and defines a patient opening configured to receive a patient's head. In various aspects, the Halbach dome comprises a plurality of access apertures and/or gaps that may be adjustable in size.