Magnetic resonance imaging method and apparatus with motion-corrected model-based acceleration of parameter mapping
First Claim
1. A method for generating magnetic resonance (MR) image data, comprising:
- operating an MR data acquisition scanner to execute an MR data acquisition sequence to acquire an MR signal from a subject, said MR signal being produced by a relaxation of nuclear spins in the subject after excitation of said nuclear spins in said MR data acquisition sequence;
entering numerical values representing said MR signal into a memory organized as k-space, thereby populating said memory with k-space data;
providing an image reconstruction computer with a reconstruction algorithm that uses a modeling of said relaxation that requires said MR signal to exhibit a model signal behavior in order to apply said reconstruction algorithm to said MR signal;
when said MR signal does not exhibit said model signal behavior due to motion of the subject, applying a motion correction procedure to said k-space data to give the MR signal represented by the k-space data said model signal behavior, and thereby obtaining motion-corrected k-space data;
in said reconstruction computer, applying said reconstruction algorithm, including said modeling of said relaxation, to reconstruct image data from the motion-corrected k-space data; and
making the image data available from the reconstruction computer in electronic form as a datafile.
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Abstract
In a magnetic resonance (MR) method and apparatus, an image reconstruction algorithm is used to reconstruct image data from k-space data that represent an acquired MR signal, and the reconstruction algorithm makes use of a model that requires the MR signal to exhibit a signal behavior from a relaxation model. In order to permit the reconstruction algorithm to be used when the acquired MR signal does not exhibit the model signal behavior due to motion of the subject, the k-space data are motion-corrected so as to produce corrected k-space data that represent said model signal behavior, and image data are reconstructed from the corrected k-space data using the reconstruction algorithm.
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Citations
12 Claims
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1. A method for generating magnetic resonance (MR) image data, comprising:
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operating an MR data acquisition scanner to execute an MR data acquisition sequence to acquire an MR signal from a subject, said MR signal being produced by a relaxation of nuclear spins in the subject after excitation of said nuclear spins in said MR data acquisition sequence; entering numerical values representing said MR signal into a memory organized as k-space, thereby populating said memory with k-space data; providing an image reconstruction computer with a reconstruction algorithm that uses a modeling of said relaxation that requires said MR signal to exhibit a model signal behavior in order to apply said reconstruction algorithm to said MR signal; when said MR signal does not exhibit said model signal behavior due to motion of the subject, applying a motion correction procedure to said k-space data to give the MR signal represented by the k-space data said model signal behavior, and thereby obtaining motion-corrected k-space data; in said reconstruction computer, applying said reconstruction algorithm, including said modeling of said relaxation, to reconstruct image data from the motion-corrected k-space data; and making the image data available from the reconstruction computer in electronic form as a datafile. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A magnetic resonance (MR) apparatus comprising:
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an MR data acquisition scanner; a control computer configured to operate the MR data acquisition scanner to execute an MR data acquisition sequence to acquire an MR signal from a subject, said MR signal being produced by a relaxation of nuclear spins in the subject after excitation of said nuclear spins in said MR data acquisition sequence; a memory accessible by said control computer; said control computer being configured to enter numerical values representing said MR signal into a memory organized as k-space, thereby populating said memory with k-space data; an image reconstruction computer provided with a reconstruction algorithm that uses a modeling of said relaxation that requires said MR signal to exhibit a model signal behavior in order to apply said reconstruction algorithm to said MR signal; when said MR signal does not exhibit said model signal behavior due to motion of the subject, said image reconstruction computer being configured to apply a motion correction procedure to said k-space data to give the MR signal represented by the k-space data said model signal behavior, to thereby obtain motion-corrected k-space data; said reconstruction computer being configured to apply said reconstruction algorithm, including said modeling of said relaxation, to reconstruct image data from the motion-corrected k-space data; and said reconstruction computer being configured to make the image data available from the reconstruction computer in electronic form as a datafile. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification