126 results about "Array coil" patented technology

A RF array coil system and method for magnetic resonance imaging are provided. The array coil system includes an anterior coil section having a main anterior coil section and at least one secondary anterior coil section removably attachable to the main anterior coil section. The array coil system further includes a posterior coil section having a main posterior coil section and at least one secondary posterior coil section removably attachable to the main posterior coil section.

An electric motor comprises a housing, a magnetic rotor and a stator which comprises at least one circuit board. The magnetic rotor comprises a disk with circumferentially arrayed magnetic poles. The circuit board on each side comprises one layer of circumferentially arrayed coil windings arranged in pairs, thus each pair made as a spiral that extends from a center of a start coil winding to a center of an end coil winding with the same turn direction of the spiral in relation to each of centers. The layers are the same in transparent view and shifted angularly in such a way thus centers of the start coil windings from one side of the circuit board coincided and electrically connected by via's with centers of the end coil windings on the other side of the circuit board.

A MRI array coil for imaging a human includes a posterior array, an anterior torso array and an anterior head-neck-upper-chest array. The head-neck-upper-chest array has a head portion mountable to the anterior array and a neck-upper-chest portion hingingly attached to the head portion.

A MRI array coil includes a plurality of first coils in a receive coil array and a plurality of second coils in a transmit coil array. The receive coil array and the transmit coil array are electrically disjoint.

In a linear motor, each arrayed coil unit (160) of a stator yoke (151) is divided into an upper coil (161) and lower coil (162). A cooling pipe (153) is interposed between the upper coil (161) and the lower coil (162).

A magnetic resonance imaging (MRI) array coil system and method for breast imaging are provided. The MRI array coil system includes a top coil portion with two openings configured to receive therethrough objects to be imaged. The MRI array coil system further includes a bottom coil portion having two openings configured to access from sides of the bottom coil portion the objects to be imaged. The top coil portion and bottom coil portion each have a plurality of coil elements configured to provide parallel imaging.

A method and apparatus for acquiring high resolution MR images of a carotid artery. A six-channel RF coil array has three RF coils placed in an overlapping pattern and positioned adjacent to a first region-of-interest (ROI) of an imaging patient. The six-channel RF coil also has three RF coils placed in an overlapping pattern and positioned adjacent to a second ROI of an imaging patient.

An integrated motorized pump (1) comprising an impeller (2) mounted on an axle (3), two magnetic drives (6) electromagnetically coupled to an electric motor (7), a casing (8) with a flowing space (9), an inlet channel (10) and an (11). The impeller (2) has circumferential arrayed magnetic means (13) magnetized in the direction parallel to the axle (3). The electric motor (7) comprising said impeller (2) as a rotor, and two stator plates (20). The stator plates (20) are covered with a liquid tight coating and comprise circumferential arrayed coils (21) etched on circuit board metal layers (22). Each magnetic drive (6) comprises a stator (14) with circumferential arrayed coil windings (16) and two magnetized disks (15). The magnetized disks (15) are mounted on the axle (3) perpendiculary to it and have a circumferential carry of radially extending poles (17).

An electric drive comprising a stator with at least two ring-shaped windings and controllers, and a magnetized rotor with an axis of rotation. Each of said windings comprises at least one coil layer with circumferentially arrayed coils located around said axis, and a layer of electro-insulating material, and each winding is electrically connected to a power source through an individual controller. At least two said windings are electrically connected by their controllers in parallel, with the possibility to function jointly and / or independently. At least two nearest windings are located in such a way that two said coil layers belonging to the different windings are separated by an additional layer of electro-insulating material. The coils of said nearest coil layers of different windings are made the same in transparent view, so that the distances between corresponding parts of said coils of said nearest windings are equal to the thickness of said additional layer of an electro-insulating material. At least two said nearest windings are made as parts of a common multi-layer printed circuit board.

An electric drive comprising a stator with at least two ring-shaped windings and controllers, and a magnetized rotor with an axis of rotation. Each of said windings comprises at least one coil layer with circumferentially arrayed coils located around said axis, and a layer of electro-insulating material, and each winding is electrically connected to a power source through an individual controller. At least two said windings are electrically connected by their controllers in parallel, with the possibility to function jointly and / or independently. At least two nearest windings are located in such a way that two said coil layers belonging to the different windings are separated by an additional layer of electro-insulating material. The coils of said nearest coil layers of different windings are made the same in transparent view, so that the distances between corresponding parts of said coils of said nearest windings are equal to the thickness of said additional layer of an electro-insulating material. At least two said nearest windings are made as parts of a common multi-layer printed circuit board.

The invention relates to an array coil system of an azimuthal electromagnetic wave resistivity logging instrument while drilling, wherein the array coil system (2) is wound in a corresponding hole or groove in a coil carrier (1) and comprises a plurality of groups of transmitting coils and a plurality of groups of receiving coils; the transmitting coils are symmetrically distributed longitudinal coils of different spacing; and the receiving coils are symmetrically distributed on the two sides of the center of the array coil system (2) and comprise longitudinal coils with coil system magnetic dipole direction coaxial with the instrument and transverse coils with coil system magnetic dipole direction vertical with the instrument. According to the array coil system, the characteristics of stratum azimuth, dip, resistivity and anisotropy can be achieved, and information such as stratum structure change and distance from a wellbore to the boundary of a reservoir stratum can also be achieved; and the array coil system has an important effect on accurate geological guidance and reservoir stratum evaluation in a well drilling process. The array coil system is suitable for the technical field of logging in oil and gas exploration.

The invention relates to a method of parallel imaging reconstruction in parallel magnetic resonance imaging reconstruction. Magnetic resonance data is acquired in parallel by an array of separate RF receiver coils. A reconstruction method based on Tikhonov regularization is presented to reduce the SNR loss due to geometric correlations in the spatial information from the array coil elements. In order to reduce the noise amplification of the reconstruction so-called “g-factor”, reference scans are utilized as a priori information of the final reconstructed image to provide regularized estimates for the reconstruction using the L-curve technique. According to the invention the method with the proposed L-curve approach was fully automatic and showed a significant reduction in average g-factors in the experimental_images.

The invention relates to an array induction logging coil system for measuring the formation resistivity. The coil system consists of a transmitting coil and 7 sets of double-receiving coils which consist of a plurality of screening coils and a plurality of main receiving coils, wherein the transmitting coil and each set of the double-receiving coils form a sub array, all 15 coils are wound on a non-conductive frame, the screening coils are connected with the main receiving coils in series, however, the winding directions of the screening coils and the main receiving coils are opposite, the set of the position of the main receiving coils considers the radial investigation depth, the lengthways resolution ratio and the signal focusing and synthesizing treatment requirement, the screening coils are arranged between the transmitting coil and the main receiving coils, the position and the number of the screening coils meet the condition of offsetting direct coupled signals, change the radial investigation depth and the lengthways resolution ratio, and meet the condition that the signal to noise ratio is 2-4; the other screening coils except the first sub array coil in the 7 sub array coils are overlapped with the center positions of the main receiving coils of the former sub array; and the investigation range of the resistivity is wide, so that the coil system can measure the formation resistivity more accurately.

A RF array coil system and method for magnetic resonance imaging are provided. The array coil system includes an anterior coil section having a main anterior coil section and at least one secondary anterior coil section removably attachable to the main anterior coil section. The array coil system further includes a posterior coil section having a main posterior coil section and at least one secondary posterior coil section removably attachable to the main posterior coil section.

An inspection system including a radio frequency (RF) subsystem and a quadrupole resonance (QR) tube array coil. The RF subsystem may include a variable frequency RF source to provide RF excitation signals at a frequency generally corresponding to predetermined, characteristic QR frequencies of a specimen. The QR tube array coil may be implemented using a plurality of conductive tubes defining a cavity of predetermined volume. Typically, the plurality of conductive tubes are spaced at a distance relative to one another to form at least two non-conductive gaps between tubes in the array. After RF excitation signals are applied to the specimen within the cavity, the QR tube array coil may generate a QR output signal responsive to QR signals generated by the specimen.

A cooler for electronic devices provides cool air to the inlet sides of the heat sink by using a radial blower with blades located around air outlets of the heat sink. This blower is driven by a brushless DC electric motor. The motor has an opening in the center allowing for the transfer of incoming air to the center of the heat sink. The rotors outer circumferential arrayed poles are rigidly secured to the frame of the radial blower. The stator of the motor is rigidly secured to the heat sink and has an opening in its center. The stator comprises circumferential arrayed coils on circuit board material. When the current flows through the stator coils, the coils acquire a magnetic polarity. The poles of the rotor and stator coils attract and repel depending on the polarities. The cool air comes simultaneously from opposite sides of the heat sink. For this reason the heat sink has a divider located approximately in the middle of the heat sink fins. The blades of the radial blower are located around the air outlets on the heat sink. Because the ambient air is drawn in from both sides of the heat sink the air path length through the heat sinks channels is effectively halved. This results in an increased cooling ability for the heat sink because of the increase in temperature differentials.

An array coil for sensing signals in magnetic resonance experiments incorporates the traditional loop-butterfly array elements at spaced positions along an axis of the sample with additional stacked twisted loops and / or twisted butterfly elements. The twisted loop and twisted butterfly elements are centered along between the standard loop-butterfly array elements. The twisted array elements are naturally isolated from both the loop and butterfly. Alternatively, for a two dimensional mesh array of loop elements, additional twisted loop array elements are added with both longitudinal and transverse orientations, again centered between loop elements. The goal is to allow separation of loop and / or butterfly elements of linear (Spine), 2D planar arrays (Cardiac) or cylindrical arrays of curved array elements (Head), for improved parallel MRI capabilities such as the SENSE or SMASH techniques, but to recover the SNR lost in between the elements and improve the g-factor of the total array with additional orthogonal array elements.

The present invention relates to an underwater propelling device (10) ia stator (20) comprising circumferential arrayed coils (35) and being adapted to generate a controlled electromagnetic field along an axial direction,a shaftless propellant rotor (30) comprising:at least two magnetized ring-shaped plates, respectively an upper magnetized plate (31) and a lower magnetized plate (32), coaxially spaced-apart along said axial direction and perpendicular thereto such that said circumferential arrayed coils (35) are positioned therebetween, each plate (31, 32) defining a central aperture (31a, 32a) and having a circumferential array of radially extended magnetized poles (34) embedded therein, said magnetized poles (34) generating a magnetic field which interacts with the electromagnetic field of the stator (20) so as to cause the rotation of said plates (31, 32) about a central axis (ZZ′) parallel to said axial direction,at least one ring-shaped propeller (33) defined by its outer periphery and its inner periphery, said propeller being received inside the central apertures (31a, 32a) of said plates (31, 32) and fixedly secured thereto,a plurality of propeller blades (35) projecting inward from the inner periphery of said propeller (33), said blades (35) producing a thrust along the central axis (ZZ′) when the plates (31, 32) rotate,wherein the rotor (30) is axially separated from the stator (20) by a gap, preferably less than 3 mm, so as to permit the formation of a hydraulic film inside said gap, said hydraulic film being adapted to provide lubrication of the rotor, thus reducing friction between the rotor and the stator, and to transmit the axial thrust force of the rotor to the stator.

A volume coil for a magnetic resonance (MR) tomography apparatus has a number of array coils or coil parts arranged on at least one coil carrier. The coil carrier annularly encloses or the coil carriers annularly encloses or enclose a cross-sectional area that can be varied by modifying the position of the coil carriers or parts thereof relative to one another.

A magnetic resonance imaging apparatus includes an array coil in which a plurality of element coils are arranged to receive magnetic resonance signals from a subject, a calculation unit which calculates projection data for the element coils regarding an arrangement direction of the plurality of element coils on the basis of the plurality of magnetic resonance signals received by the plurality of element coils, and a determination unit which determines the positions of the plurality of element coils or the position of the array coil on the basis of the projection data for the plurality of element coils.

An integrated blower for cooling device comprises an electric drive with at least one set of a flat stator and a magnetized rotor, a casing with an inlet and an outlet, and radial impeller. The flat stator integrated with the casing thus the flat stator serves as at least a part of the casing, and the magnetized rotor integrated with the radial impeller. The flat stator comprises circumferential arrayed coils with magnetic axes coincide with a plane of the flat stator. The radial impeller comprises blades attached to a backplate and a shroud, and circumferential arrayed magnetic means thus serve as the magnetized rotor. The magnetic means placed and magnetized along the plane of the flat stator thus magnetic axes of the coils and the magnetic means located at one plane substantially.

An imaging device for imaging an anaesthetized animal such as a rodent (rats or mice or other animals), with the device having a split array coil capable of providing at least two channels for use in a restraining assembly with animal bed for magnetic resonance imaging (MRI) the animal in real-time in a non-destructive manner.

An imaging device for imaging an anaesthetized animal such as a rodent (rats or mice or other), with the device having a split array coil providing at least two channels for use in a restraining assembly and animal bed for magnetic resonance imaging (MRI) the animal in real-time in a non-destructive manner.

The invention relates to a method of parallel imaging reconstruction in parallel magnetic resonance imaging reconstruction. Magnetic resonance data is acquired in parallel by an array of separate RF receiver coils. A reconstruction method based on Tikhonov regularization is presented to reduce the SNR loss due to geometric correlations in the spatial information from the array coil elements. In order to reduce the noise amplification of the reconstruction so-called “g-factor”, reference scans are utilized as a priori information of the final reconstructed image to provide regularized estimates for the reconstruction using the L-curve technique. According to the invention the method with the proposed L-curve approach was fully automatic and showed a significant reduction in average g-factors in the experimental images.

A computer program product (1344, 1346, 1348) comprising machine executable instructions for performing a method of acquiring a magnetic resonance image (1342), the method comprising the steps of: acquiring (100, 200, 300) a set of coil array data (1334) of an imaging volume (1304) using a coil array (1314), wherein the set of coil array data comprises coil element data acquired for each antenna element (1316) of the coil array; acquiring (102, 202, 302) body coil data (1336) of the imaging volume with a body coil (1318), wherein the body coil data and / or the array coil data is sub-sampled; reconstructing (104, 204, 206, 304, 306, 308) a set of coil sensitivity maps (1338) using the set of coil array data and the body coil data, wherein there is a coil sensitivity map for each antenna element of the coil array; acquiring (106, 208, 310) magnetic resonance imaging data (1340) of the imaging volume using a parallel imaging method (1332); and reconstructing (108, 210, 312) the magnetic resonance image using the magnetic resonance imaging data and the set of coil sensitivity maps.

A vertical field MRI RF coil array for neurovascular imaging includes a head section having a solenoid coil element and a quadrature coil element; a neck section having a solenoid coil element and a quadrature coil element; and a chest section having a solenoid coil element and a quadrature coil element.

The invention relates to a wireless charging device, in particular to a wireless magnetic-resonance charging device based on array coils. The wireless magnetic-resonance charging device comprises a power supply, a control circuit, a driving circuit and a transmitting terminal, which are sequentially connected, and a receiving terminal and an electric energy converting circuit, which are sequentially connected, wherein the transmitting terminal comprises a plurality of spiral coils; the receiving terminal is a spiral coil. The wireless magnetic-resonance charging device has the advantages as follows: 1, different from conventional circular coils, the coils adopting efficient array structures can enable an electromagnetic field to be distributed uniformly to a certain extent; 2, the distribution of the electromagnetic field generated by the efficient array coils compared with conventional coils is more regular; 3, under a certain external environmental condition, the distribution of the efficient array coils can be regulated so as to efficiently transmit electric energy; 4, the transmitting array coils and the receiving array coil can have the same or different structures and can be flexibly regulated.