摘要:
A gradient coil system for a magnetic resonance apparatus has gradient coils and at least one cooling tube for cooling the gradient coils using a coolant flowing through the cooling tube. The cooling tube is formed of a flexible thermoplastic material, augmented with a filler, and has a thermal conductivity greater than 0.5 W/mK.
摘要:
Magnetic resonance device (1) with an assembly (3) having a recess, in which a gradient coil unit (9) is attached with at least one attachment means (15, . . . 15D), the attachment means (15 ... 15D) having two members (21,23), between which an elastic element (25) is disposed, only one of the members (21,23) in each instance being in contact with either the gradient coil unit (9) or the assembly (3), with the attachment means (15, . . . 15D) acting as an attachment means (15, . . . 15D) having no elastic element (25) in a first attachment state, in which at least a minimum force (FMIN) presses the two members (21, 23) together, in that the two members (21, 23) have stop surfaces (31), which are in contact with each other due to the minimum force acting on the members (21, 23) [lacuna] compressed elastic element (25) and with the attachment means (15, . . . 15D) acting as a spring unit in a second fixing state, in that the elastic element (25) pushes the members (21, 23) apart in the event of forces smaller than the minimum force (FMIN) and causes the attachment means (15, . . . 15D) to be fixed in relation to the gradient coil unit (9) and the assembly (3). This has the advantage that there is no loosening of the attachment means in particular even in the event of thermal fluctuations.
摘要:
In a shim board system with at least one shim board formed by an insulating substrate and at least one conductor trace on the substrate for generation of a shim magnetic field, in particular for homogenization of the basic magnetic field of a magnetic resonance apparatus, the insulating substrate is fashioned as a mesa in at least one segment similar to the conductor trace and following the curve of the conductor trace. Upon sealing, this allows a good saturation of the shim board system with sealing compound.
摘要:
In a method for the production of an insulated plate for a gradient coil, bodies that serve as spacers for the creation of flow paths for a casting resin are produced on a base by a plate having apertures therein being used to spread the bodies on the base or to mold the bodies on the base from a moldable material.
摘要:
In a method for manufacturing a gradient coil system for a magnetic resonance apparatus, the conductor arrangement of the gradient coil system is produced by successively applying respective layers of metal powder sinter material on a workpiece platform, and successively sintering the respective layers by the application of radiation, such as laser radiation, to the individual layers, and the conductor arrangement is assembled with other components to produce the gradient coil system. A gradient coil system manufactured in accordance with this method includes a number of assembled components, including an electrical conductor arrangement, with the electrical conductor arrangement having conductors formed by radiation-sintered metal powder material.
摘要:
Supporting tube made from reinforced plastic for magnetic resonance scanners with tracks for a patient bed and load-bearing shells formed on both sides, opening upwardly, with fastening members on the undersides is manufactured including the guide rails and the under embedded fastening members from mold-cast plastic and is locally provided with cast-in reinforcements only in the region bf the load-bearing shells.
摘要:
New initiators which are suitable for cationic polymerization have the following structure: ##STR1## such that following apply: R.sup.1 and R.sup.2 are alkyl or cycloalkyl or they, together with the S atom, form a heterocyclic ring,R.sup.3 is H or alkyl,R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are H, alkyl, or alkoxy,X.sup.-- is a non-nucleophilic anion.Reaction resin mixtures with initiators of this type contain, in addition to a cationically polymerizable monomer and/or oligomer, 0.01 to 10% by mass of the initiator.
摘要:
Curable reaction resin mixtures which are suitable for stereolithography have the following composition:a cationically curable monomer and/or oligomer,an initiator with the following structure: ##STR1## where the following applies: R.sup.1 and R.sup.2 are alkyl or cycloalkyl, or together with the S atom they form a heterocyclic ring,R.sup.3 is H or alkyl,R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are H, alkyl or alkoxy,X.sup.- is a non-nucleophilic anion,and optionally a filler, pigment and/or additive.
摘要:
An electrical device is produced using components that are designed and fabricated of material that is substantially free of flame retardant additives. At least some of the components are coated with a flame retardant coating to give those components fire protection capability that satisfies applicable regulations. The frame retardant coating can be applied to the components either before assembly thereof to form the electrical device, or can be applied to the assembled apparatus.
摘要:
For generating of magnetic resonance exposures of an examination subject, a dielectric element with high dielectric constant is positioned on the examination subject to locally influence the B1 field distribution, the dielectric element being formed primarily of material whose magnetic resonance line(s) is/are shifted by at least a specific degree relative to the magnetic resonance line of water protons for a given magnetic field. In a measurement for generation of a magnetic resonance exposure a measurement sequence is used, such in the acquisition of the raw image data the dielectric material of the dielectric element supplies no signal contributions for the image generation and/or the signals caused by the dielectric material of the dielectric element can be separated from the signals caused by the examination subject.