Abstract: A method and control device operate a magnetic resonance system in order to execute a first pulse sequence that includes an excitation phase and an acquisition phase. In the excitation phase, a first gradient is applied in a gradient direction to generate a spatially dependent basic magnetic field. A selective radio-frequency excitation pulse is executed, wherein the selective radio-frequency excitation pulse excites a first material and does not excite a second material in a first partial region of an examination volume, and wherein the selective radio-frequency excitation pulse does not excite the first material and excites the second material in a second partial region of the examination volume. In the acquisition phase, non-selective refocusing pulses are executed in order to acquire raw data of the first and second partial region of the examination volume, which acquisition is spatially coded along the gradient direction.

Abstract: A method for controlling a magnetic resonance system outputs a pulse sequence including a first slice-selective excitation pulse that excites a first slice with a first magnetization. The pulse sequence includes a second slice-selective excitation pulse that excites a second slice with the first magnetization and a third slice-selective excitation pulse that excites the first slice with a second magnetization that cancels the first magnetization. The pulse sequence also includes and a fourth slice-selective excitation pulse that excites the second slice with a magnetization that cancels the first magnetization. The first slice and the second slice intersect.

Abstract: A method and a control sequence determination device are provided for determining a magnetic resonance control sequence that includes a multichannel pulse train with a number of individual RF pulse trains sent out in parallel by a magnetic resonance system over different independent radio-frequency transmit channels. The multichannel pulse train is calculated based on a predetermined target function with a predetermined target magnetization in an RF pulse optimization method. The RF pulse optimization method takes account of the magnetization in the form of a non-linear equation and of a local radio-frequency load and in a plurality of volume elements in the form of quadratic equation systems.

Abstract: A method for determining an activation sequence for a magnetic resonance device is provided. The activation sequence includes single pulses to be emitted simultaneously for a plurality of individually activatable high-frequency transmission channels. The method includes determining an amplitude and a phase of a plurality of square-wave subpulses, of which the single pulse is composed, by a pulse optimization method for a predefined target magnetization for each of the single pulses. The method also includes determining optimized, layer-selective subpulses for each square-wave subpulse of the plurality of square-wave subpulses while retaining phase and integral of the square-wave subpulse with regard to a bandwidth of the plurality of square-wave subpulses and/or the quality of a profile of a layer to be excited.

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: A method and control a sequence determination device for determining a magnetic resonance system-activation sequence are provided. The magnetic resonance system-activation sequence includes a multichannel pulse having a plurality of individual HF pulses to be emitted in a parallel manner by the magnetic resonance system by way of different independent high-frequency transmit channels. A multichannel pulse is calculated based on a predefined MR excitation quality using an HF pulse optimization method, and an HF pulse length is optimized with respect to an HF energy parameter.

Abstract: A method and a control sequence determination device for determining a magnetic resonance system control sequence is disclosed. The magnetic resonance system control sequence includes a multi-channel pulse with a plurality of individual high-frequency (HF) pulses to be transmitted in parallel by the magnetic resonance system via different independent high-frequency transmission channels. In one embodiment, the method includes calculating a multi-channel pulse based on an MR excitation quality parameter in an HF pulse optimization method. An HF pulse includes a plurality of successive HF partial pulses in discrete time steps. The method further includes considering, in the course of the HF pulse optimization method, a transmission bandwidth of an HF partial pulse to be transmitted during a discrete time step. A method for operating a magnetic resonance system and a magnetic resonance system that includes the control sequence determination device are disclosed.

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: 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: 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 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 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.