Patent application number | Description | Published |
20080231276 | MAGNETIC RESONANCE SYSTEM WITH RADIO-FREQUENCY SHIELD WITH FREQUENCY-DEPENDENT SHIELDING EFFECT - A magnetic resonance system has a basic magnet that generates a static basic magnetic field in an examination volume, and a whole-body antenna that emits a homogeneous radio-frequency field in the examination volume, the homogeneous radio-frequency field exhibiting an excitation frequency so that nuclei in an examination subject in the examination volume are excited to emit magnetic resonance signals, and a radio-frequency shield. The radio-frequency shield is arranged between the whole-body antenna and the basic magnet. The whole-body antenna is arranged between the radio-frequency shield and the examination volume. The radio-frequency shield is fashioned to exhibit a high shielding effect in a shielding frequency range that encompasses the excitation frequency. The shielding effect drops to a significantly lower shielding effect on both sides at side bands adjoining the shielding frequency range. The shielding frequency range and the side bands exhibit bandwidths that are significantly smaller than the excitation frequency. | 09-25-2008 |
20080315113 | BEAM GUIDANCE MAGNET - A beam guidance magnet for deflecting a beam of electrically charged particles along a curved particle path is provided. The beam guidance magnet includes a coil system that does not include a ferromagnetic material affecting the beam guidance and has curved coils stretched out along the particle path, the coils being arranged in pairs in mirror symmetry to the beam guidance plane. The coil system includes two primary coils and two substantially flat secondary coils. The two primary coils include primary coil sides and primary coil end parts bent upward relative to the beam guidance plane. The two substantially flat secondary coils are disposed between the primary coil end parts. Supplementary coils are disposed in the field range of the respective curved secondary coil end parts. | 12-25-2008 |
20090090871 | Radiation treatment system with a beam control magnet - A radiation treatment system with a beam control magnet for deflecting a beam of electrically charged particles along a curved particle path. The beam control magnet is subdivided along a parting plane perpendicular to the direction of the particle path into a first region and a second region. The quadrupole moments of the beam control magnet have different signs in the first region and the second region. | 04-09-2009 |
20090101832 | DEFLECTING A BEAM OF ELECTRICALLY CHARGED PARTICLES ONTO A CURVED PARTICLE PATH - A device for deflecting a beam of electrically charged particles onto a curved particle path is provided. The device includes at least one beam guidance magnet having a coil system which has at least one coil that is curved along the particle path for the purpose of deflecting the beam onto a curved particle path, and at least one scanner magnet for variably deflecting the beam in a y,z plane at right angles to the particle path, characterized in that the device has at least one correction system which is embodied to influence the particle path in a regulated or controlled manner with the aid of electric and/or magnetic fields as a function of the position of the beam in the y,z plane. The invention also relates to a corresponding method for deflecting a beam of electrically charged particles onto a curved particle path. | 04-23-2009 |
20090321654 | BEAM GUIDING MAGNET FOR DEFLECTING A PARTICLE BEAM - A beam guiding magnet includes a first and second coil system, which are designed such that the dipole moments of the first and second coil systems point in opposite directions. Since the dipole moments of the first and second coil systems point in opposite directions, the two dipole moments at least partially compensate for one another. The resultant dipole moment of the beam guiding magnet may be reduced. The beam guiding magnet may take into account that the remote field of a beam guiding magnet can be lowered by a reduction in the dipole moment of the beam guiding magnet. The dipole moment decreases with the cube of the distance from the beam guiding magnet. A quadruple moment, which on attenuation of the dipole moment represents the next strongest field component, decreases with the fifth power of that distance. | 12-31-2009 |
20090322329 | MAGNETIC RESONANCE APPARATUS AND METHOD FOR DETERMINING A PULSE SEQUENCE TO FEED AN RF RADIATING COIL - In a magnetic resonance apparatus having an RF radiating coil and gradient coils, and in a method for operating such a magnetic resonance apparatus, a pulse sequence, composed of multiple time steps, is specified for operating the gradient coils to time-dependently select regions of a selected slice of a selected volume of a subject. A non-linear equation system is then solved to obtain feed parameters for individual channels of the transmit coil for each time step, with specification of a desired target magnetization, and dependent on the pulse sequence specified for the gradient coils. The non-linear equation system is based on discrete values for time and space variable and, in addition to equations resulting from the Bloch equation, which are non-linear in their feed parameters, includes at least one additional equation that describes boundary conditions for the examination of the subject. | 12-31-2009 |
20100108318 | METHOD AND DEVICE FOR THE IN-SITU EXTRACTION OF A HYDROCARBON-CONTAINING SUBSTANCE, WHILE REDUCING THE VISCOSITY THEREOF, FROM AN UNDERGROUND DEPOSIT - A device for the in-situ extraction of a hydrocarbon-containing substance, while reducing the viscosity thereof, from an underground deposit, has at least one injection pipeline extending in the deposit and at least one production pipeline leading out of the deposit, which together form a so-called well pair. The injection and production pipelines each have a starting region extending above ground in some areas, and an active region connecting to the starting region inside the deposit. With the method, during a heating phase hot steam is applied to the injection and production pipelines, while during a production phase hot steam is applied only to the injection pipeline. Furthermore, the active region of the injection pipeline is additionally configured as an induction heater regarding the surrounding area in the deposit. In the associated device, for example, the well pair formed by the injection pipeline and production pipeline can be configured as electrodes. | 05-06-2010 |
20100252249 | DEVICE FOR IN SITU EXTRACTION OF A SUBSTANCE COMPRISING HYDROCARBONS - A device for in situ extraction of a substance including hydrocarbons while reducing the viscosity thereof from an underground storage site is provided. The device includes at least one production pipeline leading out of the storage site, and at least two electrodes which are inductively and resistively effective relative to at least parts of the storage site. | 10-07-2010 |
20100274086 | POSITION CONTROL OF MEDICAL APPLIANCES IN THE HUMAN BODY BY MEANS OF PHASE DIFFERENCE MEASUREMENT - A system measures a change in position of a medical appliance, such as an endoscopy capsule. A device uses this measurement in order to influence the position of the medical appliance. The medical appliance sends a signal that is received by a multiplicity of spatially separate receiving devices. The time profile of the phase differences between the received signals and a reference signal provides an indication of whether the medical appliance has moved. In the event of a movement being detected, a maneuvering device can be regulated by a regulating means in such a way that the maneuvering device generates forces and/or torques and applies them to the medical appliance to counteract the detected movement. | 10-28-2010 |
20100308825 | METHOD AND DEVICE FOR SELECTING BODY MODEL POSITIONS FOR SAR MONITORING OF A MAGNETIC RESONANCE TRANSMIT ARRAY - In a method and a device for specific absorption rate monitoring in a magnetic resonance system wherein multiple transmit coils are independently charged with respective currents, a primary model point voxel and at least one auxiliary model point voxel are automatically selected from among multiple voxels that model a modeled examination subject. The primary model point voxel is that voxel in which an absolute maximum of a total field variable occurs that is produced by the respective electrical fields emitted by the transmit coils. The at least one auxiliary model point voxel is that voxel in which a relative maximum of the variable occurs. The primary model point voxel and the at least one auxiliary model point voxel are stored, and specific absorption rate monitoring of an actual examination subject in the magnetic resonance system is implemented during the acquisition of magnetic resonance data in respective voxels of the actual examination subject corresponding to the stored primary model point voxel and the stored at least one auxiliary model point voxel. | 12-09-2010 |
20100327867 | METHOD TO DETERMINE PARAMETERS TO CONTROL THE GRADIENT COILS AND RADIO-FREQUENCY COILS OF A MAGNETIC RESONANCE DEVICE - In a method for examination subject-specific determination of parameters for activating gradient coils and radio-frequency of a coil array of a magnetic resonance device to generate a radio-frequency pulse with which nuclear spins in an examination region of an examination subject are moved out of a rest state by an arbitrary angle, a control unit activates phases and amplitudes of currents in the radio-frequency coils and respective currents in the gradient coils in a time-dependent manner in discrete steps to generate gradient fields. In a processor in communication with the control unit, parameters for the activation are automatically calculated dependent on measured sensitivity maps of the radio-frequency coils at the examination subject. The processor optimizes a non-linear equation system within the numerical calculation of the parameters involving a desired magnetization and a theoretical calculated real magnetization. The Jacobian matrix of the real magnetization is calculated in the determination of the parameters dependent on the direction of decline of the magnetization. The matrix elements of the Jacobian matrix consist of products of individual rotations that are determined from the optimized parameters. In the calculation of each matrix element, only factors in which the corresponding parameter is associated with the time step of the matrix element are determined. | 12-30-2010 |
20110006055 | Apparatus for the Inductive Heating of Oil Sand and Heavy Oil Deposits by way of Current-Carrying Conductors - An apparatus for the inductive heating of oil sand and heavy oil deposits by way of current-carrying conductors is provided. The conductors include individual conductor groups, wherein the conductor groups are designed in periodically repeating sections of defined length defining a resonance length, and wherein two or more of the conductor groups are capacitively coupled. In this way, each conductor can be advantageously insulated and may include a single wire. | 01-13-2011 |
20110042063 | Apparatus for in-situ extraction of bitumen or very heavy oil - An apparatus for the in situ extraction of bitumen or very heavy oil from oil sand deposits, and applying heat energy to the deposit to reduce the viscosity of the bitumen is provided. A high-frequency generator feeds electric power to a linearly extended conductor loop at a predefined depth of an oil sand deposit, the inductance of the conductor loop is compensated in some sections or continuously. Advantageously, one of the conductors of the conductor loop may be disposed substantially in a vertical direction above the extraction pipe. | 02-24-2011 |
20110042085 | Method and Apparatus for In Situ Extraction of Bitumen or Very Heavy Oil - A method to extract bitumen or very heavy oil in situ from oil sand seams close to the Earth's surface is provided. Energy is introduced via at least two pipes at a given, repeatable distance from the seam, a predefined geometry is maintained in relation to the well pair. The associated apparatus includes at least one additional pipe which is alternatively designed as an electrode or also for feeding vapor and is placed above the injection pipe. | 02-24-2011 |
20110048717 | METHOD AND DEVICE FOR "IN-SITU" CONVEYING OF BITUMEN OR VERY HEAVY OIL - A method is for conveying bitumen or heavy oil in a deposit is provided. The bitumen or very heavy oil is liquefied by way of an inductive conductor loop as a heater and is led away using an extraction pipe, wherein the conductor loop and the extraction pipe are disposed relative to one another such that the heating and thus extraction of bitumen or very heavy oil is maximized. To this end, one of the conductors of the conductor loop is disposed substantially vertically above the extraction pipe. | 03-03-2011 |
20110146968 | Installation for the in Situ Extraction of a Substance Containing Carbon - An installation for the in-situ extraction of a substance including hydrocarbons from an underground deposit is provided. The conductor and return conductor of the inductor lines are guided essentially vertically in the capping to the bottom of the deposit, at a small maximum lateral distance of 10 m compared to the length of the lines, but especially less than 5 m. Preferably, the inductor lines are guided horizontally in the deposit and are at different distances in certain areas. Furthermore, the electrical conductors and return conductors perpendicularly extending in the capping preferably combine to form a conductor pair. In this way, the conductor pair can be introduced into a single borehole which reaches into the reservoir and splits only once it has arrived in the reservoir. | 06-23-2011 |
20110146981 | Method and Device for the "In-Situ" Conveying of Bitumen or Very Heavy Oil - A method for the “in situ” extraction of bitumen or very heavy oil is provided. An electric/electromagnetic heater to reduce the viscosity of bitumen or very heavy oil with at least two linearly expanded conductors are configured in a horizontal alignment at a predetermined depth of the reservoir. The conductors are connected to each other in an electrically conducting manner inside or outside of the reservoir, and together form a conductor loop, and are connected to an external alternating current generator outside of the reservoir for electric power. The heating of the reservoir is predetermined in a chronologically and/or locally variable manner in accordance with the electric parameters, and may be changed outside of the reservoir for optimizing the feed volume during the conveying of the bitumen. At least one generator is present in the related device, wherein the parameters thereof are variable for the electric power. | 06-23-2011 |
20120286778 | METHOD AND DEVICE FOR DETERMINING A MAGNETIC RESONANCE SYSTEM CONTROL SEQUENCE - A method for determining a magnetic resonance system control sequence that includes a multichannel pulse with a plurality of individual RF pulses to be transmitted in parallel by a magnetic resonance system via different independent RF transmit channels is provided. Using a predefined target magnetization, a multichannel pulse is determined in an RF pulse optimization method. Pulse shapes of the RF pulses for the different RF transmit channels are each described by a linear combination of trial functions. Coefficients of the linear combinations of trial functions are determined in the RF pulse optimization method. | 11-15-2012 |
20130062064 | METHOD AND DEVICE FOR THE "IN-SITU" TRANSPORT OF BITUMEN OR EXTRA-HEAVY OIL - A technique is provided for extracting a substance containing hydrocarbon from a reservoir, wherein the reservoir is applied with thermal energy in order to reduce the viscosity of the substance. As per the technique, at least two conductor loops for the inductive energization are provided as electric/electromagnetic heating elements. Each of the at least two conductor loops has at least two extended conductors, which are guided horizontally inside the reservoir. At least two alternating current generators are provided for electric power, each being connected to a respective conductor loop. The technique involves operating a first of the at least two alternating current generators and at least a second of the at least two alternating current generators synchronously with respect to their frequency and with a fixed phase position in relation to one another. | 03-14-2013 |
20130090896 | METHOD FOR DETERMINING AN OPTIMAL STRUCTURE OF A HIGH-FREQUENCY SHIELD OF A HIGH-FREQUENCY ANTENNA OF A MAGNETIC RESONANCE ARRANGEMENT - A method determines an optimal structure of a high-frequency shield of a high-frequency antenna of a magnetic resonance arrangement. The high-frequency shield shields the high-frequency antenna from a gradient-coil arrangement. A three-dimensional initial structure of the high-frequency shield is defined in accordance with structural parameters and jointly with the high-frequency antenna, the gradient-coil arrangement, or both the high-frequency antenna and the gradient-coil arrangement. The structural parameters are optimized via an optimization method with respect to at least one optimization criterion. | 04-11-2013 |
20130192831 | DEVICE AND METHOD FOR THE RECOVERY, IN PARTICULAR IN-SITU RECOVERY, OF A CARBONACEOUS SUBSTANCE FROM SUBTERRANEAN FORMATIONS - A device is provided for extracting a hydrocarbon-containing substance from a reservoir. Thermal energy can be applied to the reservoir in order to reduce the viscosity of the substance. The device includes at least one conductor loop for inductively supplying electric current, to provide electric and/or electromagnetic heating, and a fluid conducting device for transporting and introducing a solvent fluid into the reservoir, to further reduce the viscosity of the substance. | 08-01-2013 |