Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A control device for a magnetic resonance system activates the coils of a transmission array and a gradient magnet system of the magnetic resonance system by causing an excitation pulse to be supplied to each coil. A magnetization that exhibits a first actual inhomogeneity thereby is generated in an excitation volume of the magnetic resonance system. The control device determines the excitation pulse for each coil using a start pulse and a maximum allowable inhomogeneity. The respective start pulse has a total time duration. When the control device activates the coils of the transmission array and of the gradient magnet system corresponding to the start pulse, a magnetization that exhibits a second actual inhomogeneity that is smaller than the maximum permissible inhomogeneity is generated in the excitation volume.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An outer balloon is provided in the interior thereof with a coil conductor for a local endo coil for intracorporeal placement for recording magnetic resonance signals, which can be deployed for the purpose of receiving signals. In addition to the coil, a filling medium is fed into the balloon, so that the deployed coil conductor is surrounded at least in sections by at least one material having a dielectric constant ?r>1.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A control device for a magnetic resonance system activates the coils of a transmission array and a gradient magnet system of the magnetic resonance system by causing an excitation pulse to be supplied to each coil. A magnetization that exhibits a first actual inhomogeneity thereby is generated in an excitation volume of the magnetic resonance system. The control device determines the excitation pulse for each coil using a start pulse and a maximum allowable inhomogeneity. The respective start pulse has a total time duration. When the control device activates the coils of the transmission array and of the gradient magnet system corresponding to the start pulse, a magnetization that exhibits a second actual inhomogeneity that is smaller than the maximum permissible inhomogeneity is generated in the excitation volume.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: In a method and magnetic resonance apparatus wherein a homogenous magnetization is generated in a spatial examination volume of the apparatus during examination of a subject, individual resonator segments of a body coil, that are electromagnetically decoupled from each other, are separately activated by a control and evaluation device according to sets of predetermined segment-specific excitation parameters stored in the control and evaluation device. The resonator segments are temporally sequentially excited in an excitation sequence, using different excitation parameter sets with phase distributions of the nuclear magnetization distributions in the examination volume constructively superimposing to form a resulting homogenous entire nuclear magnetization distribution in the examination volume.