Method and apparatus for determining respiration phase, magnetic resonance imaging method and system

An apparatus for determining a respiration phase of a respiration signal, comprising:

• extraction circuitry configured to extract a distance characteristic value, a score characteristic value, and an area characteristic value from the respiration signal, the distance characteristic value, the score characteristic value, and the area characteristic value indicating waveform variation between two adjacent waveforms in the respiration signal;
• and
• determining circuitry configured to (i) train a respiration signal model according to the distance characteristic value, the score characteristic value, and the area characteristic value, and (ii) determine the respiration phase of the respiration signal using the respiration signal model,
• wherein a magnetic resonance imaging (MRI) apparatus uses the determined respiration phase of the respiration signal to perform magnetic resonance imaging of an examination region of an examination subject, and
• wherein the area characteristic value represents a ratio of (i) an area formed by two crest points of the two adjacent waveforms in the respiration signal and a trough point between the two adjacent waveforms in the respiration signal to (ii) an area formed by a second waveform of the two adjacent waveforms in the respiration signal.

A non-transitory readable storage medium having a program stored thereon that, when executed by one or more processors, cause the one or more processors to:

• extract a distance characteristic value, a score characteristic value, and an area characteristic value from a respiration signal, the distance characteristic value, the score characteristic value, and the area characteristic value indicating a waveform variation between two adjacent waveforms in the respiration signal;
• train a respiration signal model according to the distance characteristic value, the score characteristic value, and the area characteristic value;
• determine a respiration phase of the respiration signal using the respiration signal model;
• and
• perform a magnetic resonance imaging of an examination region of an examination subject using the determined respiration phase,
• wherein the area characteristic value represents a ratio of (i) an area formed by two crest points of the two adjacent waveforms in the respiration signal and a trough point between the two adjacent waveforms in the respiration signal to (ii) an area formed by a second waveform of the two adjacent waveforms in the respiration signal.