Abstract: In an MR tomography apparatus damping laminated sheets are provided for reducing vibrations The MR tomography apparatus has a magnet body which is surrounded by a magnet housing which surrounds and delimits an interior volume. A gradient coil system is located in this interior volume. On an inner side of the magnet housing that delimits the interior volume, a damping laminated sheet structure is provided for absorbing acoustic vibrations which are produced on switching of the gradient coil system.

Abstract: Magnetic resonance tomography device has a gradient coil system that is fashioned such that the natural oscillation modes of the gradient coil system and the Lorentz forces are optimally orthogonally oriented toward one another, and a scalar product of the natural oscillation mode and the Lorentz force is formed for each point of the gradient coil system. A summation of these products, results in a value that is as close to zero as possible for each natural oscillation mode with the natural oscillation modes being prescribed by a weight- and/or spring rigidity distribution of the carrier structure, by weights that are introduced into the carrier structure and/or by components that modify the spring rigidity, or by heavy end rings and/or by setting the Lorentz forces by fashioning the conductor arrangement of the primary coil and/or a secondary coil, if present, and/or additional conductor sections given tubular gradient coil systems.

Abstract: In a method for operating a magnetic resonance tomography apparatus that contains a basic field magnet, a gradient system with gradient coils and a control system that controls the currents in the gradient coils, among other things, on the basis of pulse sequences, noise that is caused by a pulse sequence upon implementation thereof is identified before a start of the pulse sequence. When an identified noise lies above a selectable value, the pulse sequence is modified, so that the modified pulse sequence does not exceed the selectable value when it is implemented.

Abstract: A magnetic resonance tomography apparatus has a basic field magnet system and a gradient coil system. At least a part of a vacuum housing of an evacuatable space is thereby formed by at least a surface region of the basic field magnet system and by at least a surface region of the gradient coil system. Propagation of oscillations (vibrations) of the gradient coil system to the basic field magnet system via an intermediate layer between those surfaces of the gradient coil system and of the basic field magnet system that face each other is prevented by a vacuum in the evacuatable space. In economical and space-saving fashion, the vacuum housing of the evacuatable space is formed to a large part by systems that are already needed for the operation of the apparatus.

Abstract: In a method for the operation of a magnetic resonance apparatus having at least one gradient coil and elements for generating a force acting on the gradient tube, with which natural oscillation modes of the gradient tube are excited, so as to oppose oscillations of the gradient tube produced by Lorentz forces, drive signals are supplied for the excitation of the elements, and the amplitudes and/or the phases of the drive signals are varied for adjusting the force generated by the elements and acting on the gradient tube so as to compensate modifications of the oscillatory behavior of the gradient tube. The drive signals are varied dependent on at least one measured value representing a criterion for the change of the oscillatory behavior.

Abstract: A magnetic resonance apparatus has a gradient tube at which at least one gradient coil with current flowing therein in operation is arranged, and at which a number of elements for generating a force acting on the gradient tube as needed are arranged, with the positions of the elements being selected dependent at least on the vibratory mode of the gradient tube, so that a counteracting mode is excited given drive of the elements. The elements serving for the excitation of X and/or Y modes are distributed in the middle and around the circumference of the gradient tube with respect to the length of the gradient tube and/or the elements serving for the excitation of the Z mode are distributed along the length and the circumference of the gradient tube.

Abstract: A magnetic resonance apparatus has a gradient coil system which has at least one flexible and thermally conductive damping structure that contains a flexible matrix and thermally conductive, particulate fillers. At least parts of a cooling device of the gradient coil system are arranged within the damping structure.

Abstract: A support assembly especially suitable as a drive unit support includes a block of resilient material having inserts made of substantially harder material with facing surfaces which extend in nonparallel directions to at least partially extinguish sound waves of disturbing vibration frequencies by interference after reflection from the surfaces.

Abstract: A quick-change tool holder for a lathe including a tool carriage, the holder comprising a support member adapted to be mounted on the tool carriage, a tool holder member adjacent the support member and including a first bore extending generally perpendicularly from the support member, and a second bore extending at about a right angle from the first bore. The holder also includes a mechanism for attaching the tool holder member to the support member, which mechanism comprises a mounting member which is detachably mounted on the support member, which is received in the first bore in the tool holder member, and which includes a bore.