Abstract: A magnetic resonance system includes a magnet device, which is arranged in an outer housing and an inner housing located therein. A monitoring method includes determining a value of a vibration amplitude of the outer housing or an intermediate housing located between the inner housing and the outer housing at a vibration frequency; providing a transmission ratio between the vibration amplitude and the operating parameter at the vibration frequency; and determining a value of the operating parameter as a function of the determined value of the vibration amplitude by means of the transmission ratio.

Abstract: A magnetic resonance device comprising a gradient coil assembly having gradient coils is described. The gradient coils are supported by at least one cylindrical coil carrier for generating gradient fields. As part of the gradient coil assembly, at least one vibration sensor is provided for measuring vibrations of the gradient coil assembly at least in a radial direction of oscillation.

Abstract: In a method for actuating a shim coil arrangement of a magnetic resonance data acquisition scanner that has a shim controller that operates said shim coil arrangement, and a gradient coil arrangement operated by a gradient controller, the gradient controller determine a gradient pulse shape, in accordance with specifications of a magnetic resonance data acquisition sequence, that is activated by the gradient coil arrangement, when the sequence is executed in said scanner. A modifies the gradient pulse shape and provides the modified gradient pulse shape to the shim controller and the shim controller generates shim settings dependent on the modified gradient pulse shape, and actuates said shim coil arrangement according to the shim settings during activation of the gradient pulse shape by the gradient coil arrangement during execution of the sequence in said scanner.

Abstract: In a method and an apparatus for magnetic resonance tomography, an eddy current field is compensated by taking into account its progression over time and its dependence on a sensed value, by having a sensor determine the sensed value and, on the basis of the sensed value, a current strength for a conductor in order to generate an opposing field to reduce the eddy current field is determined, and supplied to the conductor.

Abstract: A gradient coil for magnetic resonance imaging has at least two conductors that are independent of one another, designed to jointly generate a magnetic field gradient and a magnetic field of a higher order in the examination region of a magnetic resonance scanner.

Abstract: In a method and an apparatus for magnetic resonance tomography, an eddy current field is compensated by taking into account its progression over time and its dependence on a sensed value, by having a sensor determine the sensed value and, on the basis of the sensed value, a current strength for a conductor in order to generate an opposing field to reduce the eddy current field is determined, and supplied to the conductor.

Abstract: In a method for actuating a shim coil arrangement of a magnetic resonance data acquisition scanner that has a shim controller that operates said shim coil arrangement, and a gradient coil arrangement operated by a gradient controller, the gradient controller determine a gradient pulse shape, in accordance with specifications of a magnetic resonance data acquisition sequence, that is activated by the gradient coil arrangement, when the sequence is executed in said scanner. A modifies the gradient pulse shape and provides the modified gradient pulse shape to the shim controller and the shim controller generates shim settings dependent on the modified gradient pulse shape, and actuates said shim coil arrangement according to the shim settings during activation of the gradient pulse shape by the gradient coil arrangement during execution of the sequence in said scanner.

Abstract: A connecting device for a magnetic system of an imaging system includes a holding element for connection of the connecting device to a power supply connection of the magnetic system, and a connecting element for connection of the connecting device to a power supply cable for operation of the magnetic system. The connecting device also includes an oscillation damping device having a spring element. The oscillation damping device is operable to dampen oscillations of the magnetic system that act on the connecting device by way of the holding element, with respect to the connecting element.

Abstract: The present embodiments relate to a method for reducing mechanical vibrations in a magnetic resonance imaging system that includes a gradient system having a gradient coil body and an electrically conductive shroud that at least partly encloses the gradient coil body. The method includes determining a mechanical natural vibration mode of the gradient coil body in the magnetic resonance imaging system, and determining excitation force components for the natural vibration mode. The method also includes determining electrically conductive areas of the gradient system, which during operation of the magnetic resonance imaging system, generate a Lorentz force component that contributes to the excitation force components. The method further includes modifying the determined electrically conductive areas such that a minimal number of the Lorentz force components coincide with the excitation force components.

Abstract: A cylindrical gradient coil arrangement is provided for a magnetic resonance device. The arrangement includes at least one conductive structure that forms at least one gradient coil and a cooling device that uses a cooling fluid to cool the at least one conductive structure. The arrangement includes an outer carrier structure and an inner carrier structure. The outer carrier structure includes two tubular, coaxial outer sections with different diameters. The inner, tubular carrier structure is arranged between and coaxially with the outer sections. The conductive structure is placed on the inner carrier structure. The inner carrier structure is spaced from the outer sections by a clearance. The clearance forms a cooling channel through which the cooling fluid of the cooling device may flow. The inner carrier structure is fastened to the outer carrier structure at least in a point-by-point manner.

Abstract: A supply line apparatus for an electrical connection of a gradient coil unit in a magnetic resonance device includes a first supply line unit and a second supply line unit. The second supply unit is disposed at least partially coaxially to the first supply line unit. The first supply line unit and/or the second supply line unit has at least one conducting supply line element. The supply line apparatus includes an oscillation decoupling unit that has at least one oscillation-suppressing supply line element.

Abstract: The invention relates to the invention provides innovative long-lived and hydrolysis-stable biobased plastics based on polyhydroxyalkanoate (PHA) and featuring sufficient melt stability, a method for producing them and their use.

Abstract: In a computerized, automated method to determine the conductor structure of a gradient coil of a magnetic resonance device, the conductor structure is determined depending on the theoretical oscillation response of at least one metallic structure of the magnetic resonance device that is arranged adjacent to the gradient coil at the installation point, with the oscillation response of the metallic structure being determined dependent on theoretical eddy currents generated in the structure by the gradient coil.

Abstract: A cylindrical gradient coil arrangement is provided for a magnetic resonance device. The arrangement includes at least one conductive structure that forms at least one gradient coil and a cooling device that uses a cooling fluid to cool the at least one conductive structure. The arrangement includes an outer carrier structure and an inner carrier structure. The outer carrier structure includes two tubular, coaxial outer sections with different diameters. The inner, tubular carrier structure is arranged between and coaxially with the outer sections. The conductive structure is placed on the inner carrier structure. The inner carrier structure is spaced from the outer sections by a clearance. The clearance forms a cooling channel through which the cooling fluid of the cooling device may flow. The inner carrier structure is fastened to the outer carrier structure at least in a point-by-point manner.

Abstract: The present embodiments relate to a method for reducing mechanical vibrations in a magnetic resonance imaging system that includes a gradient system having a gradient coil body and an electrically conductive shroud that at least partly encloses the gradient coil body. The method includes determining a mechanical natural vibration mode of the gradient coil body in the magnetic resonance imaging system, and determining excitation force components for the natural vibration mode. The method also includes determining electrically conductive areas of the gradient system, which during operation of the magnetic resonance imaging system, generate a Lorentz force component that contributes to the excitation force components. The method further includes modifying the determined electrically conductive areas such that a minimal number of the Lorentz force components coincide with the excitation force components.

Abstract: A connecting device for a magnetic system of an imaging system includes a holding element for connection of the connecting device to a power supply connection of the magnetic system, and a connecting element for connection of the connecting device to a power supply cable for operation of the magnetic system. The connecting device also includes an oscillation damping device having a spring element. The oscillation damping device is operable to dampen oscillations of the magnetic system that act on the connecting device by way of the holding element, with respect to the connecting element.

Abstract: A supply line apparatus for an electrical connection of a gradient coil unit in a magnetic resonance device includes a first supply line unit and a second supply line unit. The second supply unit is disposed at least partially coaxially to the first supply line unit. The first supply line unit and/or the second supply line unit has at least one conducting supply line element. The supply line apparatus includes an oscillation decoupling unit that has at least one oscillation-suppressing supply line element.

Abstract: The present invention relates to novel long-lasting and hydrolysis-resistant bio-based plastics based on polyester resins, the use thereof and the process for the production thereof.

Abstract: The present invention provides innovative long-lasting and hydrolysis-stable biobased plastics based on polyhydroxyalkanoate (PHA), a method for producing them and their use.

Abstract: A detector unit for arrangement in a field generating unit of a magnetic resonance device has an RF transmission/reception system for transmitting RF pulses into, or receiving magnetic resonance signals from, an examination volume of the field generation unit. The RF transmission/reception system surrounds a patient tunnel at a radial distance from a tunnel axis thereof, and is divided into two sub-systems located at a distance from each other along the direction of the tunnel axis, so as to form a substantially annular cavity or interstice therebetween.