Patent application number | Description | Published |
20080197847 | Detuning of an Rf Shielded Mri Scan Room - The present invention relates to a system and method magnetic resonance (MR) imaging. Furthermore the invention relates to the use of a material and to a computer program. In order to provide a technique which allows to prevent standing waves in an RF cage ( | 08-21-2008 |
20080262340 | Moving Table Mri - The invention relates to a MRI system and to a method for producing an image with such an system. In order to provide a MR imaging technique with a high efficient MR signal acquisition, which provides a high level of comfort to a patient, a MRI system and method are suggested, where image data from an object are acquired while the object is moving with variable speed relative to the MRI system, and where the image data are combined and an image of the object is reconstructed. | 10-23-2008 |
20080315878 | Actively Shielded Gradient Coil System Comprising Additional Additional Eddy Current Shield System - The present invention relates to a magnetic resonance imaging (MRI) system. The basic components of a MRI system are the main magnet system, the gradient system, the RF system and the signal processing system. The gradient system comprises normally three orthogonal primary coils and three orthogonal shield coils. The shield coils of the gradient system are usually designed to minimize the generation of eddy currents within the main magnet system. However, such a gradient system designed to minimize the generation of eddy currents is not optimal with respect to mechanical vibrations inside the gradient system. It is also possible to design the shield coils of the gradient system in a way to minimize mechanical vibrations inside the gradient system. However, such a gradient system is not optimal with respect to the minimization of eddy currents. The present invention provides a magnetic resonance imaging system, comprising at least: a main magnet system; a gradient system, said gradient system comprising primary coil-like elements and shield coil-like elements, said shield coil-like elements being designed to provide Lorentz force compensation for the primary coil-like elements thereby minimizing, preferably eliminating, mechanical vibrations inside the gradient system; and an eddy current shield system positioned between said main magnet system and said gradient system, said eddy current shield system being mechanically decoupled from the main magnet system and/or the gradient system. | 12-25-2008 |
20090082659 | MEDICAL EXAMINATION APPARATUS - The invention relates to a medical examination apparatus, in particular an MR apparatus. Known MR apparatus have a cavity for accommodating the patient to be examined that offers only a limited space for the patient. The limited space may lead to claustrophobic reactions jeopardizing the result of a measurement. According to the invention a mirror ( | 03-26-2009 |
20090209842 | MRI GRADIENT COIL ASSEMBLY WITH REDUCED ACOUSTIC NOISE - The invention relates to a magnetic resonance imaging system which comprises means for generating a static magnetic field and a gradient coils system for generating a time varying magnetic gradient field by use of a first electrical current and a second electrical current. The gradient coils system is located in the magnetic field and the gradient coils system has a plurality of vibrational modes. Lorentz forces are generated due to the interaction of the first and/or second electrical currents with the superposition of the static magnetic field and the magnetic gradient field. The gradient coils system and/or the first electrical current are adapted so that the integral of the in-products of said Lorentz forces and a vibrational mode of said plurality of vibrational modes is at a value close to zero, wherein said in-products are determined for all points of the gradient coils system, and wherein the integral is determined by summing the in-products determined for all the points. As the above mentioned integral is close to zero or preferably zero, the Lorentz forces are not able to excite the vibrational mode (for example the lowest order bending mode) of the gradient coils system. Thus acoustical noise that is generated by a vibrating gradient coils system is reduced and the comfort for a patient that is examined by the magnetic resonance imaging system is therefore enhanced. | 08-20-2009 |
20090237076 | MAGNETIC RESONANCE IMAGING APPARATUS, A METHOD AND A COMPUTER PROGRAM FOR COMPENSATION OF A FIELD DRIFT OF THE MAIN MAGNET - In accordance with the technical measure of the invention in order to counteract the positive feedback between the superconducting magnet and the shim iron a pair of superconducting shunts ( | 09-24-2009 |
20090237079 | MAGNETIC RESONANCE DEVICE AND METHOD - The invention relates to a device ( | 09-24-2009 |
20090267601 | RF RECEIVE COIL ASSEMBLY WITH INDIVIDUAL DIGITIZERS AND MEANS FOR SYNCHRONIZATION THEREOF - The invention relates to a device ( | 10-29-2009 |
20100007347 | SPLIT GRADIENT COIL FOR MRI - An MR system comprising an improved gradient coil that does not compromise patient comfort is disclosed herein. The MR system is either a bore-type or a gap-type system and comprises a main magnet ( | 01-14-2010 |
20100277174 | PASSIVE SHIMS TO INCREASE THE EFFECTIVE B0 and B1 UNIFORMITY IN A BODY COIL - A magnetic resonance imaging system ( | 11-04-2010 |
20110210739 | MAGNETIC RESONANCE IMAGING SYSTEM COMPRISING A POWER SUPPLY UNIT ADAPTED FOR PROVIDING DIRECT CURRENT ELECTRICAL POWER - A MRI system for acquiring MRI image data comprising a data acquisition means comprising a plurality of subunits for acquiring MRI image data, a power distribution means for providing the means for acquiring MRI image data with electrical power, the power distribution means comprising: a power supply unit adapted for providing direct current electrical power from an alternating current electrical mains, a power bus adapted for supplying the subunits with the direct current electrical power, control means for controlling the supply of direct current electrical power by the power bus to the subunits. | 09-01-2011 |
20140333306 | USE OF GRADIENT COILS FOR CORRECTING HIGHER ORDER BO FIELD INHOMOGENEITIES IN MR IMAGING - The invention relates to a method of correcting higher order B | 11-13-2014 |