In a method and apparatus to acquire magnetic resonance image data; an examination subject is positioned in a magnetic resonance apparatus to acquire magnetic resonance image data of the examination subject with a magnetic resonance sequence, and sequence parameters of the magnetic resonance sequence are established. First control commands of the magnetic resonance sequence are generated using the established sequence parameters. The first control commands are optimized so as to generate an optimized magnetic resonance sequence, the optimization of the first control commands including a conversion of the first control commands into optimized control commands. A test to review the optimized magnetic resonance sequence is implemented, the test including a comparison of the first control commands with the optimized control commands. The optimized magnetic resonance sequence is executed to acquire the magnetic resonance image data with the optimized control commands depending on the result of the test.

An apparatus for detachably fastening an NMR probe head with a pedestal box to an NMR magnet system of an NMR spectrometer has a holding system rigidly connected to the magnet system. A base plate of the holding system fastens detachably to the probe head pedestal box. A receiving device on or in the base plate receives all electric, electronic, optical, pneumatic, and thermal feed lines and optionally discharge lines required for the operation of the probe head. A lower side of the base plate in contact with an upper side of the pedestal box comprises multiple connecting elements into which the feed lines and discharge lines merge. The upper side of the pedestal box comprises receiving elements into which the feed lines and discharge lines from the connecting elements merge in a predetermined relative assembled position.

A nuclear magnetic flowmeter (1) for determining the flow of a medium flowing through a measuring tube (2), having a magnetic field generator (3) having permanent magnets for generating a magnetic field interfusing the medium over a magnetic field section L.sub.M, having a pre-magnetization section L.sub.VM located within the magnetic field section L.sub.M and having a measuring device also located in the magnetic field section L.sub.M including a coil-shaped antenna (4) with the length L.sub.1 serving as a measuring antenna. At least one coil-shaped antenna (5) is provided in the pre-magnetization section L.sub.VM for generating a pulse or pulse sequence spoiling the magnetization of the medium in the direction of the magnetic field.

Various methods and systems are provided for a common mode trap for a magnetic resonance imaging (MRI) apparatus. In one embodiment, a common mode trap comprises: a first conductor and a second conductor counterwound around a length of a central conductor, the first and the second conductors radially spaced a distance from the central conductor, the first and second conductors fixed to a first side of the central conductor; and a third conductor and a fourth conductor counterwound around the length of the central conductor, the third and fourth conductors are radially spaced the distance from the central conductor, the third and fourth conductors fixed to a second side of the central conductor opposite the first side. In this way, the density of common mode trap conductors in a common mode trap may be increased, thereby increasing the mutual inductance between the common mode trap and the central conductor.

Flow measurement of hydrogen density, volumetric concentrations, and longitudinal relaxation times and transverse relaxation times have all n components in pairs different to each other. The method has the steps of: enclosing a mixture inside a probe volume and polarizing the mixture with a magnetic field; measuring the mixture enclosed inside the probe volume in terms of its longitudinal or transverse relaxation behaviour by means of pulsed electromagnetic waves at least n times with a different volumetric share of its components to measure at least n different relaxation curves; obtaining the relaxation times from the relaxation curves; obtaining the thermal equilibrium magnetizations M.sub.0 of the individual components from the relaxation curves; and correlating yielded thermal equilibrium magnetizations M.sub.0 of the individual components to calculate the hydrogen densities and the volumetric share of the components for each relaxation curve.

A rotation mechanism includes a bearing mechanism and a drive mechanism. Prior to loading of a sample unit, bearing gas is supplied to a bearing mechanism. In the course of inserting the sample unit, bearing gas is sprayed to a surface of the sample tube from around the sample tube to thereby center the sample unit.

The present disclosure provides a system. The system may include a medical device, a couch, one or more imaging devices, and a control device. The medical device may include a cavity. The couch may be configured to support a subject. The one or more imaging devices may be configured to acquire image data. The image data may indicate at least one of a target portion of the subject or posture information of a user. The control device may be configured to control a movement of the couch based on at least one of position information of the target portion of the subject or the posture information of the user.

In a method and a control sequence determination device for determining a magnetic resonance system control sequence includes at least one radio-frequency pulse train to be emitted by a magnetic resonance system, a target magnetization is acquired and a k-space trajectory is determined. A radio-frequency pulse train for the k-space trajectory is then determined in an RF pulse optimization method using a target function, wherein the target function includes a combination of different trajectory curve functions, of which at least one trajectory curve function is based on a trajectory error model. A method for operating a magnetic resonance system uses such a control sequence and a magnetic resonance system has such a control sequence determination device.

A method for operating a nuclear magnetic flowmeter in which the necessary time for determining a longitudinal relaxation time constant of the medium is reduced in comparison to the prior art by at least one nuclear-magnetic measuring process being carried out on a magnetized medium in the measuring tube. The at least one nuclear-magnetic measuring process includes an inversion pulse and acquisition sequences, each acquisition sequence beginning at a starting point in time in respect to the at least one nuclear-magnetic measuring process and has an activating pulse, a first waiting interval, a first refocusing pulse, an echo interval with a duration, a second refocusing pulse, a second waiting interval and a deactivating pulse. An echo signal is measured in the echo interval, and a longitudinal relaxation time constant of the medium is determined using the echo signals.

In a method for providing application information for a magnetic resonance examination of a patient using a magnetic resonance apparatus, position data are provided to a control computer of the apparatus from a mobile accessory unit, wherein the mobile accessory unit is arranged during the magnetic resonance examination at least partially around the patient's body region that is to be examined. The control computer generates application information as a function of the position data from the mobile accessory unit, and emits the application information to a user.