Magnetic resonance imaging method and apparatus based on two-dimensional fast spin echo

A magnetic resonance imaging apparatus using a two-dimensional fast spin echo sequence, which uses a Balanced Steady State Free Precession Line Acquisition with Undersampling (BLADE) artifact correction sequence to perform data acquisition of magnetic resonance signal, the apparatus comprising:

• a first adjustment parameter determiner configured to determine a first adjustment parameter to preset an initial contrast of a magnetic resonance image;
• a second adjustment parameter determiner configured to determine a second adjustment parameter to obtain an optimized contrast of the magnetic resonance image and a specified data acquisition time of the BLADE artifact correction sequence;
• an echo signal evolution curve determiner configured to calculate an initial predetermined echo signal evolution curve based on the first adjustment parameter, and to determine an optimized echo signal evolution curve based on the first adjustment parameter and the second adjustment parameter;
• a variable flip angle train determiner configured to calculate an initial variable flip angle train based on the initial predetermined echo signal evolution curve, and to calculate an actual variable flip angle train based on to the optimized echo signal evolution curve;
• and
• a magnetic resonance imaging scanner configured to:
• apply the actual variable flip angle to the two-dimensional fast spin echo sequence;
• and
• use the BLADE artifact correction sequence corresponding to the second adjustment parameter to acquire magnetic resonance signals and enable the magnetic resonance image to satisfy the optimized contrast.

A magnetic resonance imaging apparatus based on a two-dimensional fast spin echo sequence, which uses a Balanced Steady State Free Precession Line Acquisition with Undersampling (BLADE) artifact correction sequence to perform data acquisition of magnetic resonance signal, the apparatus comprising:

• a processor that is configured to:
• determine a first adjustment parameter to preset an initial contrast of a magnetic resonance image;
• after the first adjustment parameter to preset the initial contrast of the magnetic resonance image, (i) calculate an initial predetermined echo signal evolution curve based on the first adjustment parameter, and (ii) calculate an initial variable flip angle train based on the initial predetermined echo signal evolution curve;
• determine a second adjustment parameter to obtain an optimized contrast of the magnetic resonance image and a specified data acquisition time of the BLADE blade-artifact correction sequence;
• determine an optimized echo signal evolution curve based on the first adjustment parameter and the second adjustment parameter;
• and
• calculate an actual variable flip angle train based on to the optimized echo signal evolution curve;
• and
• a magnetic resonance imaging scanner configured to:
• apply the actual variable flip angle to the two-dimensional fast spin echo sequence;
• and
• use the BLADE artifact correction sequence corresponding to the second adjustment parameter to acquire magnetic resonance signals and enable the magnetic resonance image to satisfy the optimized contrast.