Phase correction method
AssigneeSiemens Aktiengesellschaft
InventorVladimir Jellus
Life of this patent
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Abstract
A method corrects for a phase error in an MR image, in which MR signals of an examination subject are acquired, complex images of the examination subject are generated, phase differences of the phase values for various image points of the complex images are established with an averaged phase value of image points from a first surrounding region of a respective image point, and a phase correction is executed dependent on how well the phase differences correspond to a predetermined phase value, where the order of the image points in which the phase correction is implemented is dependent on how well the phase values in the image points correspond to the predetermined phase value.
Claims24
A method for correcting a phase error in an MR image, comprising:
- acquiring MR signals of an examination subject;
- generating complex images of the examination subject from the acquired MR signals;
- establishing phase differences of phase values for various image points of the complex images with, respectively, an averaged phase value of image points from a first surrounding region of a respective image point;
- executing a phase correction dependent on how well the phase differences correspond to a predetermined phase value, an order of the image points in which the phase correction is implemented depends on how well the phase values in the image points correspond to the predetermined phase value;
- and
- providing a user readable or machine readable output related to the phase correction.
A method for phase error correction in a magnetic resonance (MR) image, comprising:
- acquiring MR signals from an examination subject;
- through a processor, generating a complex image of the examination subject from the acquired signals, said complex image comprising a plurality of image points each having a phase value;
- in said processor, automatically determining which image points, among said plurality of image points, are in need of phase correction by, for each image point under consideration for phase correction, forming an average of respective phase values of image points within a predetermined region surrounding the image point under consideration for phase correction, forming a difference between the phase value of image point under consideration for phase correction and said average, comparing said difference to a predetermined difference value to obtain a difference comparison and, for at least some image points under consideration for phase correction that have a non-zero difference comparison, correcting the respective phases thereof in an order dependent on said difference comparison;
- in said processor, generating a corrected complex image by replacing the phase for said at least some image points with a corrected phase;
- and
- making said corrected complex image available at an output of the processor as a data file in a form convertible into a humanly perceptible image of the examination subject.
Dependencies are inferred from the claim text.