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| Number | Title | Issue Date |
| 6433549 | MR bridge support An apparatus for supporting a patient support bridge member in an MR system where a first end of the bridge is supported by an upright support member on a first side of an MR imaging bore and the bridge extends through the bore so that a second end of the... | 08/13/2002 |
| 6429655 | MR apparatus provided with a gradient coil system The invention relates to an MR apparatus with three gradient coils, the differences between said gradient coils are reduced in that the gradient directions extend obliquely to the direction of the main magnetic field.... | 08/06/2002 |
| 6424154 | Magnetic resonance imaging apparatus The image produced by a magnetic resonance imaging apparatus using a receive coil 2 has inaccuracies due to external circumstances which affect the signal produced by the coil 2. Thus, noise spikes affect the signal, although more usually extensive shield... | 07/23/2002 |
| 6414490 | MRI magnet with enhanced patient entry and positioning A magnetic resonance imaging (MRI) magnet in combination with a mobile patient-positioning device, including a patient support and a method of using same for positioning patients for MRI scanning. The patient support is rotatable through a range of orient... | 07/02/2002 |
| 6411092 | Clad metal foils for low temperature NMR probe RF coils Low-temperature (cryogenic) radio-frequency (RF) coils for nuclear magnetic resonance (NMR) applications include composite multi-layered structures including an internal normal metal layer clad on both sides by external high-purity annealed aluminum layer... | 06/25/2002 |
| 6411187 | Adjustable hybrid magnetic apparatus Adjustable hybrid magnetic apparatus for use in medical and other applications includes an electromagnet flux generator for generating a first magnetic field in an imaging volume, and permanent magnet assemblies for generating a second magnetic field supe... | 06/25/2002 |
| 6404201 | Magnetic resonance imaging RF coil A radio frequency (RF) coil system for resonance imaging/analysis comprising a primary coil element having a plurality of axial conductors spaced to form a generally tubular structure having two ends and defining a coil volume, and a first pair of spoiler... | 06/11/2002 |
| 6400149 | Nuclear magnetic resonance apparatus and method for generating an axisymmetric magnetic field having straight contour lines in the resonance region The present invention is directed to a nuclear magnetic resonance apparatus and method for generating an axisymmetric magnetic field having long, straight contour lines in the resonance region. A magnetically permeable member is used to shape the static m... | 06/04/2002 |
| 6400156 | Nuclear magnetic resonance apparatus and methods of use and facilities for incorporating the same NMR apparatus for achieving construction of improved patient access. Facilities and methods of mobile and fixed site scanning.... | 06/04/2002 |
| 6392412 | Method of correcting higher order field inhomogeneities in a magnetic resonance apparatus The invention concerns a method of correcting field inhomogeneities of higher order in a magnetic resonance apparatus After an excitation pulse and action of a phase gradient in a predetermined direction p, a data point is recorded after two predetermined... | 05/21/2002 |
| 6384604 | "Magnetic resonance apparatus having a gradient coil system with magnetostrictive material" A magnetic resonance apparatus has a gradient coil system that includes a gradient coil arrangement with a conductor and magnetostrictive material, and contains a basic field magnet system for generating a basic magnetic field. The magnetostrictive materi... | 05/07/2002 |
| 6377049 | Residuum rare earth magnet A permanent magnet for an MRI scanner is made by removing extraneous elements from an ore containing rare earth elements to leave elements Pr and Nd therein, and then selectively stripping therefrom a portion of the element Nd as a byproduct to leave an o... | 04/23/2002 |
| 6373251 | Nuclear magnetic resonance apparatus and methods of use and facilities for incorporating the same NMR apparatus for achieving construction of improved patient access. Facilities and methods of mobile and fixed site scanning.... | 04/16/2002 |
| 6369571 | MRI apparatus A magnet for magnetic resonance imaging has an interior working space within the magnet frame sufficient to accommodate a physician and a patient. Because the physician is positioned inside the magnet frame, the physician has unimpeded access to the patie... | 04/09/2002 |
| 6362623 | Gradient coil for MRI apparatus using shielding coil disposed in a high winding density zone In order to reduce the electric current loss and the heat release in a shielding coil, partially shielding coils 1Zts and 1Zbs are employed having their windings positioned corresponding only to a high winding density zone 1Zp, rather than corresponding t... | 03/26/2002 |
| 6351125 | Method of homogenizing magnetic fields An iterative method of homogenizing the magnetic field in the working volume (8) of the main field magnet (1) of a magnetic resonance apparatus uses ferromagnetic homogenizing elements (6) which are mounted at predetermined positions (9) on one or more su... | 02/26/2002 |
| 6348794 | RF coil for magnetic resonance imaging having three separate non-overlapping coils electrically isolated from each other An RF coil which is a coil array using three pieces or more of coils, including three pieces of coils 1, 2 and 3 or more arrayed proximately to each other, coil intermediary connecting capacitors 4, 5 and 6 respectively interposed in the coils, parallel c... | 02/19/2002 |
| 6346816 | Method and apparatus for magnetic resonance imaging Magnet assembly for use in medical magnetic resonance imaging includes means for increasing flux generation in the gap region to provide the capability of scanning smaller volume regions of a patient at increased levels of scanning resolution. The means f... | 02/12/2002 |
| 6342787 | Real-time multi-axis gradient distortion correction using an interactive shim set A magnetic resonance apparatus includes a main magnet (12) which generates a main magnetic field through and surrounding an examination region (14). The main magnetic field contains inhomogeneities which affect image quality. A gradient coil assembly (22)... | 01/29/2002 |
| 6340888 | Magnetic field generator for MRI A magnetic field generator for MRI comprises a pair of plate yokes opposed to each other with space in between. A magnet is provided in each of the opposed surfaces of the pair of plate yokes. A column yoke is connected to the pair of plate yokes. An enha... | 01/22/2002 |
| 6335623 | MRI apparatus A magnet for magnetic resonance imaging has an interior working space within the magnet frame sufficient to accommodate a physician and a patient. Because the physician is positioned inside the magnet frame, the physician has unimpeded access to the patie... | 01/01/2002 |
| 6335670 | Mri system with split rose ring with high homogeneity A pair of pole assemblies (12, 14) are disposed on opposite sides of an examination region (10). A ferrous flux return path includes an overhead ferrous structure (18) above the upper pole assembly and a lower ferrous structure (20) adjacent to the lower ... | 01/01/2002 |
| 6333630 | Magnetic field generating apparatus for magnetic resonance imaging system A magnetic field generating apparatus for a magnetic resonance imaging (MRI) system adopting a C-shaped open magnet support structure includes a pair of polygonal permanent magnets disposed parallel to each other in the horizontal plane, with a predetermi... | 12/25/2001 |
| 6313633 | Magnetic resonance imaging head coil A short radio frequency coil for magnetic resonance imaging of the head to provide a homogeneous magnetic field including parallel conductors forming a first cylindrical portion with end rings supporting the conductors which then continue at an angle to f... | 11/06/2001 |
| 6294915 | Interior alignment light for open magnet MRI A patient alignment device is disclosed for use in open magnet MRI having a movable patient table to move a patient within the open magnet MRI in order to position a desired patient scan area accurately within the field-of-view (FOV) of the open magnet MR... | 09/25/2001 |
| 6291997 | Correction for gradient amplifier hysteresis in acquired MRI data Image artifacts produced by residual magnetization in elements of the gradient field amplifier system are reduced by driving the residual magnetization to a preselected value at the end of each imaging pulse sequence. Reset gradient pulses are produced by... | 09/18/2001 |
| 6291998 | Basic field magnet for an MRI apparatus with a displaceable homogeneity volume A magnet assembly for a magnetic resonance imaging apparatus, has a magnet with a patient receptacle therein, the magnet producing a basic magnetic field having a homogeneity volume within the patient receptacle. Auxiliary components in the form of coils ... | 09/18/2001 |
| 6288546 | Nuclear magnetic resonance apparatus and methods of use and facilities for incorporating the same NMR apparatus for achieving construction of improved patient access. Facilities and methods of mobile and fixed site scanning.... | 09/11/2001 |
| 6281775 | Permanent magnet arrangement with backing plate A permanent magnet arrangement has a pair of permanent magnet groupings supported by a C-shaped yoke. Each magnet grouping comprises a series of circular, concentrically-arranged permanent magnets in a support frame. An adjusting mechanism allows each cir... | 08/28/2001 |
| 6278351 | Multi-coil MRI magnet A single-sided magnet for magnetic resonance imaging has a main field assembly including numerous small outer field coils arrayed around a main axis. The main field assembly may also include a central field coil coaxial with the main axis inside the array... | 08/21/2001 |
| 6275128 | MRI magnetic field generator An object of the present invention is to provide an MRI magnetic field generator with which the magnetic field uniformity within the imaging field of view of the air gap can be adjusted easily and safely, without having to detach the gradient coils, after... | 08/14/2001 |
| 6275039 | Magnetic resonance pre-polarization apparatus Interventional MRI imaging leads to the development of open magnets such as for example C-magnet 1, in which it is correspondingly more difficult to generate a large field in order to obtain a good signal-to-noise ratio. To overcome this, a pre-polarizing... | 08/14/2001 |
| 6259252 | Laminate tile pole piece for an MRI, a method manufacturing the pole piece and a mold bonding pole piece tiles A laminate tile pole piece for an MRI. Each laminate tile has a trapezoidal or annular sector shape. The trapezoidal shape allows the tiles to be attached side by side to form a multiple concentric annular array pole piece without using oddly shaped edge ... | 07/10/2001 |
| 6255822 | MRI apparatus having a short uniform field magnet with an internal space In an MRI apparatus for medical purposes it is desirable to minimize the length of the magnet system for generating the main field, inter alia in order to keep the accessibility of the region to be examined in the imaging volume as high as possible for th... | 07/03/2001 |
| 6252405 | Temperature compensated NMR magnet and method of operation therefor An MRI system includes a magnet which produces the main polarizing magnetic field. Variations in strength of this field are corrected by a temperature compensation system that calculates a compensating flux needed to maintain the field at constant strengt... | 06/26/2001 |
| 6246308 | Superconductive magnet including a cryocooler coldhead A magnet, such as an open or closed magnet, has a first assembly with at least one superconductive main coil and with a first vacuum enclosure enclosing the main coil(s). A first cryocooler coldhead has a rigid first housing and is generally vertically al... | 06/12/2001 |
| 6239680 | Magnetic field stabilization method, magnetic field generating apparatus and magnetic resonance imaging apparatus In order to provide a magnetic field stabilization method, magnetic field generating apparatus and magnetic resonance imaging apparatus that is not affected by the temperature distribution in an installation space, in stabilizing a magnetic field of a mag... | 05/29/2001 |
| 6236210 | Magnetic resonance imaging system A magnetic resonance imaging system includes a lower body which has a flat upper surface, and contains a first magnetic pole, an upper body which has a lower surface disposed in opposed relation to the upper surface of the lower body, and contains a secon... | 05/22/2001 |
| 6236207 | Coil system for magnetic resonance systems with integrated cooling unit A coil system for magnetic resonance systems that surrounds a generally cylindrical examination volume, has coil plies formed by X-gradient coils arranged symmetrically relative to the YZ plane and spaced from one another, and Y-coils arranged symmetrical... | 05/22/2001 |
| 6222366 | High frequency measuring circuit with inherent noise reduction for resonating chemical sensors The concentration of an analyte in a fluid is measured by a quartz crystal microbalance sensor device in the fluid containing a concentration of the analyte. The sensor device exhibits a resonant frequency representative of the concentration of the analyt... | 04/24/2001 |
