Method for producing MR (magnetic resonance) images of a moving object using navigator signals

A method for generating MR (magnetic resonance) images at comparable motion states of a moving object the object, having a repetitive motion pattern, wherein the images are obtained through excitation of a nuclear spin system within the object, the method comprising the steps of:

• a) selecting at least one contiguous region of successive data points as an indicator for a comparability of motion states;
• b) executing an MR measuring sequence with an excitation RF pulse applied in a presence of a first slice selection gradient having a first polarity, wherein all irradiated RF (radio frequency) pulses and switched gradients applied prior to or during occurrence of the contiguous region of step a) remain substantially unchanged for each individual MR measurement of the sequence, the individual measurements having a time separation which is shorter than a repetition rate of the motion pattern;
• and
• c) encoding MR data of step b) to produce an MR image of at least one motion state from the individual measurements, wherein the contiguous region comprises a partial region in which a second slice selection gradient is applied having a second polarity which is opposite to the first polarity of the first slice selection gradient, thereby rephasing the nuclear spin system in the partial region.