112 results about "Perpendicular magnetic field" patented technology

Provided is a vertical magnetic type MRI apparatus, which can image an arbitrary section of a wide range such as the whole body of a specimen at a high speed in a high sensitivity of even a deep portion of the specimen while suppressing the increase in a channel number. A receiving coil unit (500) is constituted to comprise a bed coil unit (600) having its longitudinal direction aligned with the body axis direction of an inspection object (103), and an upper coil unit (700) mounted removably on the bed coil unit (600). This bed coil unit (600) includes a placing face (601) for placing the inspection object (103), and a plurality of lower sub-coils arranged below the placing face (601). The upper coil unit (700) includes a plurality of upper sub-coils connected with the lower sub-coils. The upper sub-coils are arranged separately on an inner support (20-1) having a flexibility for covering the placing face (601) and an outer support (20-2) having a flexibility for covering the outer side of the inner support (20-1). The upper sub-coils and the lower sub-coils are connected by attaching the upper coil unit (700) to the bed coil unit (600), so that a plurality of kinds of sub-coils can be formed.

Measured magnetic field distribution aberrations are decomposed into eigenmode components by means of singular value decomposition, and iron piece arrangements which correspond to each mode are combined and arranged on a shim tray. The eigenmode to be corrected is selected according to the attainable magnetic field precision (homogeneity) and the suitability of the iron piece arrangement. Adjustment can be made whilst being aware of the attainable magnetic field precision (homogeneity), thus incorrect adjustments can also be ascertained and can be automatically corrected during repeated adjustments. If magnetic field adjustment is carried out with the aid of the disclosed method or a device incorporating the disclosed method, the adjustment can be reliably completed during repeated operations. Thus, the device has good magnetic field precision. Furthermore, defective magnets can be detected early by investigating the attainable homogeneity, and the method or device can be adapted to vertical field magnetic devices (open MRIs) and horizontal field MRI magnet devices.

Provided is a thin film magnetic head capable of improving recording performance. The thin film magnetic head comprises a laminate including a main pole layer and an auxiliary pole layer being disposed in a region facing the main pole layer with a non-magnetic layer in between. After magnetic flux generated in a thin film coil is contained in the auxiliary pole layer through the non-magnetic layer, and then is concentrated on a front end neighboring portion of a front end portion in the auxiliary pole layer, the magnetic flux passes through the non-magnetic layer again so as to flow into a front end portion of the main pole layer. A “main magnetic flux incoming route” flowing from a rear end portion to the front end portion in the main pole layer and an “auxiliary magnetic flux incoming route” flowing from the auxiliary pole layer to the front end portion of the main pole layer can be obtained, so an amount of the magnetic flux supplied to a portion of the front end portion of the main pole layer on a trailing side increases. As a sufficient amount of the magnetic flux is supplied to a portion of the front end portion of the main pole layer on the trailing side so that an emitting amount of the magnetic flux increases, thereby a generation intensity and a magnetic field gradient of a perpendicular magnetic field can be obtained.