Method and magnetic resonance system for imaging a partial region of an examination subject

An imaging apparatus comprising:

• a magnetic resonance data acquisition unit having a field of view, a gradient coil system, and a basic field magnet that generates a basic magnetic field;
• said magnetic resonance data acquisition unit having a patient opening therein that is configured to receive an examination subject in the magnetic resonance data acquisition unit, with a partial region of the examination subject, of which a magnetic resonance image is to be obtained, being located at least in part at an edge of said field of view;
• a processor configured to operate said magnetic resonance data acquisition unit with a data acquisition pulse sequence in order to acquire magnetic resonance data of said partial region in a multi-slice measurement in which a slice selection gradient and a readout gradient are activated in order to cause the gradient coil system of the magnetic resonance data acquisition unit to produce a slice selection gradient field and a readout gradient field, while the basic magnetic field is generated by the basic field magnet of the magnetic resonance data acquisition unit;
• said processor being configured to operate said magnetic resonance data acquisition unit with said pulse sequence in order to optimize each voxel in said image, that is located at said edge of said field of view, in each of said measurement slices of said partial region, by configuring at least one of said slice selection gradient, or said readout gradient within said pulse sequence, as an at least one configured gradient in said pulse sequence, in order to make a distortion caused by a non-linearity of the respective gradient field of said at least one configured gradient, cancel a distortion caused by a basic magnetic field inhomogeneity of said basic magnetic field that exists at each of said voxels being optimized at said edge of said field of view;
• and
• an image computer configured to reconstruct a magnetic resonance image of said partial region from said acquired magnetic resonance data.

A non-transitory, computer-readable data storage medium encoded with programming instructions, said data storage medium being loaded into a computerized control and evaluation unit of an imaging apparatus said imaging apparatus comprising:

• a magnetic resonance data acquisition unit having a field of view;
• a gradient coil system that generates respective gradient fields, each exhibiting a gradient;
• a basic field magnet that generates a basic magnetic field;
• and
• an opening configured to receive an examination subject in the magnetic resonance data acquisition unit with a partial region of the examination subject, of which a magnetic resonance image is to be obtained, being located at least in part at an edge of said field of view;
• said programming instructions causing said control and evaluation system to:
• operate said magnetic resonance data acquisition unit with a data acquisition pulse sequence in order to acquire magnetic resonance data of said partial region in a multi-slice measurement in order to cause a slice selection gradient and a readout gradient to be activated by the gradient coil system of the data acquisition unit that respectively produce a slice selection gradient field and a readout gradient field, while the basic magnetic field is generated by the basic field magnet of the magnetic resonance data acquisition unit;
• operate said magnetic resonance data acquisition unit with said pulse sequence in order to optimize each voxel in said image, that is located at said edge of said field of view, by configuring at least one of said slice selection gradient, or said readout gradient within said pulse sequence, as an at least one configured gradient in said pulse sequence, in order to make a distortion caused by a non-linearity of the respective gradient field of said at least one configured gradient, cancel a distortion caused by a basic magnetic field inhomogeneity of a basic magnetic field that exists at each of said voxels being optimized at said edge of said field of view;
• and
• reconstruct a magnetic resonance image of said partial region from said acquired magnetic resonance data.