Magnetic resonance facility operation

A magnetic resonance device comprising:

• a control device operable to perform a method for operating a magnetic resonance device in which a measurement gradient pulse is used to record magnetic resonance signals for sampling k-space along a trajectory section, wherein the measurement of the magnetic resonance signals takes place at recording times forming a measurement sampling pattern in a recording time window during the measurement gradient pulse and a shape function describing a time profile of the measurement gradient pulse is used to assign magnetic resonance signals to k-space points, wherein, in order to ascertain correction information relating to deviations of a real time profile of the measurement gradient pulse from an assumed target profile of the measurement gradient pulse in the recording time window to be used in an imaging measurement during an ascertaining process,
• wherein the magnetic resonance device is operable to measure a first correction to ascertain first magnetic resonance signals of the trajectory section by applying the measurement sampling pattern to the measurement gradient pulse under predetermined measurement conditions, and
• wherein the magnetic resonance device is operable to measure a second correction to ascertain second magnetic resonance signals of the trajectory section under the predetermined measurement conditions using a reference sampling pattern at gradient conditions of the measurement gradient pulse and/or a reference gradient pulse for which fewer deviations from an assigned reference target profile are expected;
• and
• a correction unit operable to, when a deviation criterion comparing the first and second magnetic resonance signals is satisfied, ascertain a correction function for the shape function as correction information by aligning the first and the second magnetic resonance signals to one another to improve a quality of magnetic resonance image data produced by the magnetic resonance device.

A non-transitory electronically readable data carrier on which a computer program is stored, and when executed on a control device of a magnetic resonance device, performs a method for operating a magnetic resonance device in which a measurement gradient pulse is used to record magnetic resonance signals for sampling k-space along a trajectory section, wherein the measurement of the magnetic resonance signals takes place at recording times forming a measurement sampling pattern in a recording time window during the measurement gradient pulse and a shape function describing a time profile of the measurement gradient pulse is used to assign magnetic resonance signals to k-space points, wherein, in order to ascertain correction information relating to deviations of a real time profile of the measurement gradient pulse from an assumed target profile of the measurement gradient pulse in the recording time window to be used in an imaging measurement during an ascertaining process, the method comprises:

• measuring a first correction to ascertain first magnetic resonance signals of the trajectory section by applying the measurement sampling pattern to the measurement gradient pulse under predetermined measurement conditions;
• measuring a second correction to ascertain second magnetic resonance signals of the trajectory section under the predetermined measurement conditions using a reference sampling pattern at gradient conditions of the measurement gradient pulse and/or a reference gradient pulse for which fewer deviations from an assigned reference target profile are expected;
• and
• when a deviation criterion comparing the first and second magnetic resonance signals is satisfied, ascertaining a correction function for the shape function as correction information by aligning the first and the second magnetic resonance signals to one another to improve a quality of magnetic resonance image data produced by the magnetic resonance device.