Method for evaluating a pilot tone signal in a magnetic resonance facility, magnetic resonance facility, computer program and electronically readable data medium

A magnetic resonance facility comprising:

• at least one transmit coil configured to emit an excitation signal;
• a high-frequency coil arrangement configured to measure a pilot tone signal generated by the excitation signal, wherein the pilot tone signal describes a movement of a patient;
• and
• a control facility configured to extract movement information via a breakdown of the pilot tone signal, wherein the movement information is assigned to a movement component,
• wherein the breakdown of the pilot tone signal is effected on a basis of signal components having assigned weightings,
• wherein, for the purpose of extracting the movement information, a part of a base assigned to the movement component is selected by a selection criterion, and
• wherein, for the purpose of determining the base and the weightings, a non-negative matrix factorization is performed, in the context of which a signal matrix, which is formed from the pilot tone signal, is formulated as a product of a non-negative signal component matrix that describes the base and a non-negative weighting matrix that describes the weightings.

A computer program, which, when executed on a control facility of a magnetic resonance facility, causes the magnetic resonance facility to:

• record a pilot tone signal using a high-frequency coil arrangement of the magnetic resonance facility, wherein the pilot tone signal describes a movement of a patient;
• and
• extract movement information via a breakdown of the pilot tone signal, wherein the movement information is assigned to a movement component,
• wherein the breakdown of the pilot tone signal is effected on a basis of signal components having assigned weightings,
• wherein, for the purpose of extracting the movement information, a part of a base assigned to the movement component is selected by a selection criterion, and
• wherein, for the purpose of determining the base and the weightings, a non-negative matrix factorization is performed, in the context of which a signal matrix, which is formed from the pilot tone signal, is formulated as a product of a non-negative signal component matrix that describes the base and a non-negative weighting matrix that describes the weightings.