MAGNETIC RESONANCE IMAGING SCANNER WITH PRECISELY ALIGNED MAGNETIC FIELD-MODIFYING STRUCTURE

摘要

In a method for aligning a magnetic field modifying structure (74) in a magnet bore (12) of a magnetic resonance imaging scanner (8), a reference magnetic field map of the magnet bore (12) is measured without the magnetic field modifying structure (74) inserted. The magnetic field modifying structure (74) is inserted into the magnet bore (12). A second magnetic field map of the magnetic bore (12) is measured with the magnetic field modifying structure (74) inserted. At least one odd harmonic component of the first and second magnetic field maps is extracted. The magnetic field modifying structure (74) is aligned in the magnet bore (12) based on a comparison of the odd harmonic component of the first and second magnetic field maps.