Method and apparatus for reducing artifacts in a magnetic resonance image dataset
AssigneeSiemens Healthcare GmbH
InventorsRalf Kartaeusch, Dominik Paul
Life of this patent
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Abstract
In a method and magnetic resonance (MR) apparatus for reducing artifacts in an image dataset reconstructed from MR raw data that were acquired by radial sampling using different coil elements, for each of at least some of the coil elements, exclusion information is determined that identify MR data from that coil element that are responsible for at least one artifact, by a comparison of a sensitivity map, which defines a spatial reception capability of that coil element, with at least one comparison dataset obtained from at least a portion of the MR data from that coil element. At least the MR data identified from the exclusion information are excluded from the reconstruction of the image dataset.
Claims12
A method for reducing artifacts in a magnetic resonance (MR) image dataset, comprising:
- operating an MR data acquisition scanner to acquire MR signals from a subject using a plurality of different reception coil elements, each having a respective reception sensitivity, and entering the acquired MR signals into a memory as k-space data, by radial sampling;
- for each of at least some of the reception coil elements, providing a computer with a sensitivity map that defines a spatial reception capability of the respective coil element corresponding to the reception sensitivity of the respective coil element;
- for each of said at least some of said reception coil elements, identifying exclusion information, by a comparison in said computer of the sensitivity map for the respective coil element, with at least one comparison dataset obtained from at least a part of the MR signals received by the respective coil element;
- in said computer, using said exclusion information to exclude at least some of the MR signals received by the respective reception coil element, or the k-space data corresponding thereto, as being likely to produce an artifact in an image reconstructed from said k-space data;
- and
- in said computer, reconstructing said image from said k-space data without using the excluded MR signals, and making the reconstructed image available from the computer in electronic form, as a datafile.
A magnetic resonance (MR) apparatus comprising:
- an MR data acquisition scanner comprising a plurality of different reception coil elements, each reception coil element having a reception sensitivity associated therewith;
- a computer operate configured to said MR data acquisition scanner to acquire MR signals from a subject using said plurality of different reception coil elements, and entering the acquired MR signals into a memory as k-space data, by radial sampling;
- for each of at least some of the reception coil elements, said computer being provided with a sensitivity map that defines a spatial reception capability of the respective coil element corresponding to the reception sensitivity of the respective coil element;
- said computer being configured to identify, for each of said at least some of said reception coil elements, exclusion information, by a comparison of the sensitivity map for the respective coil element, with at least one comparison dataset obtained from at least a part of the MR signals received by the respective coil element;
- said computer being configured to use said exclusion information to exclude at least some of the MR signals received by the respective reception coil element, or the k-space data corresponding thereto, as being likely to produce an artifact in an image reconstructed from said k-space data;
- and
- said computer being configured to reconstruct said image from said k-space data without using the excluded MR signals, to and make the reconstructed image available from the computer in electronic form, as a datafile.
A non-transitory, computer-readable data storage medium encoded with programming instructions, said storage medium being loaded into a control computer of a magnetic resonance (MR) apparatus comprising an MR data acquisition scanner having a plurality of different reception coil elements, each having a respective reception sensitivity, said programming instructions causing said control computer to:
- operate said MR data acquisition scanner to acquire MR signals from a subject using said plurality of different reception coil elements, and enter the acquired MR signals into a memory as k-space data, by radial sampling;
- for each of at least some of the reception coil elements, receive a sensitivity map that defines a spatial reception capability of the respective coil element corresponding to the reception sensitivity of the respective coil element;
- for each of said at least some of said reception coil elements, identify exclusion information, by a comparison of the sensitivity map for the respective coil element, with at least one comparison dataset obtained from at least a part of the MR signals received by the respective coil element;
- use said exclusion information to exclude at least some of the MR signals received by the respective reception coil element, or the k-space data corresponding thereto, as being likely to produce an artifact in an image reconstructed from said k-space data;
- and
- reconstruct said image from said k-space data without using the excluded MR signals, and make the reconstructed image available from the control computer in electronic form, as a datafile.
Dependencies are inferred from the claim text.