Abstract: A method for generating a spatially resolved magnetic resonance dataset using a coil arrangement includes providing at least one correction datum based on receiver characteristics of the coil arrangement. The method also includes providing a magnetic resonance dataset with spatially resolved signal intensity data, and correcting the at least one signal intensity datum in the magnetic resonance dataset by the correction datum before or after providing the magnetic resonance dataset.

Abstract: A method for determining a position of a mobile device relative to a B0 field magnet along a z-coordinate axis, and a device and a magnetic resonance tomography unit for performing the method are provided. The device includes a magnetic field strength sensor arranged in a fixed relative position. A characteristic magnetic field strength Bref of the B0 field magnet that emerges for a plurality of x-y coordinate pairs with a same reference z-coordinate zref is ascertained. The device is moved along the z-coordinate axis until the magnetic field strength sensor measures the characteristic magnetic field strength Bref.

Abstract: A local transmit coil for a magnetic resonance tomograph is provided. The local transmit coil includes a signal transmission device for signal transmission to the magnetic resonance tomograph, and a transmission antenna for generating a magnetic excitation field. The local transmit coil further includes an evaluation device for monitoring a function of the local transmit coil. The evaluation device is configured to transmit a status signal relating to the local transmit coil via the signal transmission device.

Abstract: A method for generating a spatially resolved magnetic resonance dataset using a coil arrangement includes providing at least one correction datum based on receiver characteristics of the coil arrangement. The method also includes providing a magnetic resonance dataset with spatially resolved signal intensity data, and correcting the at least one signal intensity datum in the magnetic resonance dataset by the correction datum before or after providing the magnetic resonance dataset.

Abstract: A method for determining a position of a mobile device relative to a B0 field magnet along a z-coordinate axis, and a device and a magnetic resonance tomography unit for performing the method are provided. The device includes a magnetic field strength sensor arranged in a fixed relative position. A characteristic magnetic field strength Bref of the B0 field magnet that emerges for a plurality of x-y coordinate pairs with a same reference z-coordinate zref is ascertained. The device is moved along the z-coordinate axis until the magnetic field strength sensor measures the characteristic magnetic field strength Bref.

Abstract: A local transmit coil for a magnetic resonance tomograph is provided. The local transmit coil includes a signal transmission device for signal transmission to the magnetic resonance tomograph, and a transmission antenna for generating a magnetic excitation field. The local transmit coil further includes an evaluation device for monitoring a function of the local transmit coil. The evaluation device is configured to transmit a status signal relating to the local transmit coil via the signal transmission device.

Abstract: In a method for determining a compensation setting for an eddy current field that is caused by a temporally variable gradient field of a magnetic resonance apparatus, at least two magnetic resonance data sets arising from different spatial positions are generated using the gradient field, and from the magnetic resonance data sets, the compensation setting of a filter is calculated, with which a control quantity of the gradient field can be pre-distorted, such that the sum from the gradient field and at least one component of the eddy current field exhibits a desired time curve, and the gradient field used for the magnetic resonance data sets is generated with a predetermined initial setting of the filter that at least approximately takes into account the component of the eddy current field.

Abstract: In a method for the compensation of disturbances due to vibrations in a magnetic resonance tomography apparatus s having a cryo-head seated on a cryostat for cooling a superconducting magnet and having a compensation device for correcting the magnetic field fluctuations generated due to the vibrations of the cryo-head, the compensation device sets the synthesizer frequency and/or the gradient currents according to the time curve of the field terms of the 0th and/or 1st orders acquired in a tune-up.

Abstract: In a method for determining a compensation setting for an eddy current field that is caused by a temporally variable gradient field of a magnetic resonance apparatus, at least two magnetic resonance data sets arising from different spatial positions are generated using the gradient field, and from the magnetic resonance data sets, the compensation setting of a filter is calculated, with which a control quantity of the gradient field can be pre-distorted, such that the sum from the gradient field and at least one component of the eddy current field exhibits a desired time curve, and the gradient field used for the magnetic resonance data sets is generated with a predetermined initial setting of the filter that at least approximately takes into account the component of the eddy current field.

Abstract: In a method for the compensation of disturbances due to vibrations in a magnetic resonance tomography apparatus s having a cryo-head seated on a cryostat for cooling a superconducting magnet and having a compensation device for correcting the magnetic field fluctuations generated due to the vibrations of the cryo-head, the compensation device sets the synthesizer frequency and/or the gradient currents according to the time curve of the field terms of the 0th and/or 1st orders acquired in a tune-up.

Abstract: In an operating method for a magnetic resonance tomography apparatus a sequence of digital signals is transmitted to the digital-analog converter. An analog signal is emitted from the digital-to-analog converter for each digital signal to a coil system for producing a gradient magnetic field. A signal processor produces a processed digital signal which is supplied to the digital-to-analog converter to produce the analog signal. A difference between the incoming digital signal and the processed digital signal Is determined by the signal processor and is added to the next incoming digital signal or at least for a portion thereof.

Abstract: In a method for acquiring eddy currents that are caused by switched magnetic field gradients and that contain cross-terms, at least the cross-terms can be determined from the selected slice within a short time, by the steps of introducing a spatially expansive phantom into the examination region of the magnetic resonance apparatus, activating a measuring gradient pulse that exhibits a prescribable pulse width, and after the deactivation of the measuring gradient pulse generating at least two imaging sequence blocks following one another at the spacings (t1, t2, tn) with at least two-dimensional, complex data set being generated from their imaging signals, the phase information contained therein being proportional to the magnetic field strength.

Abstract: In an operating method for a magnetic resonance tomography apparatus a sequence of digital signals is transmitted to the digital-analog converter. An analog signal is emitted from the digital-to-analog converter for each digital signal to a coil system for producing a gradient magnetic field. A signal processor produces a processed digital signal which is supplied to the digital-to-analog converter to produce the analog signal. A difference between the incoming digital signal and the processed digital signal Is determined by the signal processor and is added to the next incoming digital signal or at least for a portion thereof.

Abstract: In a method for avoiding image occlusions in nuclear magnetic resonance tomography apparatus that are operated with multi-echo sequences, at a time t.sub.0, a cross-magnetization in spins is generated in an examination subject with an excitation radio-frequency pulse. At times t.sub.1, t.sub.3, t.sub.5 . . . , at least two refocusing radio-frequency pulses that re-phase the cross-magnetization follow and read-out intervals follow at times t.sub.2, t.sub.4, t.sub.6 . . . The following condition is satisfied in at least one direction for the gradients G activated during the pulse sequence: ##EQU1## Even given quadratic gradient terms, thus, no phase difference occurs between a primary and a stimulated echo path. The presence of such a phase difference causes an image occlusion, and thus such occlusions are avoided by eliminating such a phase difference.

Abstract: In a method for the compensation of eddy currents caused by gradients in nuclear magnetic resonance apparatus a gradient pulse is activated and a nuclear magnetic resonance signal is excited in a slice of a spatially extended phantom, the nuclear magnetic resonance signal is acquired after the end of the gradient pulse and during the decay time of the eddy currents caused by said gradient pulse and the eddy current magnetic field is identified from the phase curve of this nuclear magnetic resonance signal. A filter for the gradient system that generates the gradient pulse is calculated on the basis of the eddy current magnetic field identified in this way.