Phase correction method, phase correction apparatus, and mri apparatus

A phase correction apparatus comprising processing circuitry configured to:

• acquire first k-space data acquired in a first readout direction and second k-space data acquired in a second readout direction that is opposite to the first readout direction;
• weight first real space data to generate first adjusted data with a predetermined weighting, wherein weight coefficients in the predetermined weighting vary depending on a pixel position in a readout direction and become lower in a region where a variance of a phase difference is larger than a predetermined variance, the first real space data being obtained by performing one-dimensional Fourier transform on the first k-space data;
• weight second real space data to generate second adjusted data with the predetermined weighting, the second real space data being obtained by performing one-dimensional Fourier transform on the second k-space data;
• calculate a correction amount for correcting a phase difference between the first adjusted data and the second adjusted data;
• and
• correct a phase difference between data that are different from each other in polarity of a gradient pulse in the readout direction during acquisition, by using the correction amount.

An MRI apparatus comprising:

• a static magnetic field magnet configured to generate a static magnetic field;
• a gradient coil configured to generate a gradient magnetic field;
• and
• processing circuitry configured to
• acquire first k-space data as data of MR signals by applying the gradient magnetic field in a first readout direction,
• acquire second k-space data as data of MR signals by applying the gradient magnetic field in a second readout direction that is opposite to the first readout direction,
• weight first real space data to generate first adjusted data with a predetermined weighting, wherein weight coefficients in the predetermined weighting vary depending on a pixel position in a readout direction and become lower in a region where a variance of a phase difference is larger than a predetermined variance, the first real space data being obtained by performing one-dimensional Fourier transform on the first k-space data;
• weight second real space data to generate second adjusted data with the predetermined weighting, the second real space data being obtained by performing one-dimensional Fourier transform on the second k-space data,
• calculate a correction amount for correcting a phase difference between the first adjusted data and the second adjusted data;
• and
• correct a phase difference between data that are different from each other in polarity of the gradient magnetic field in the readout direction during acquisition, by using the correction amount.