MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD
First Claim
1. A magnetic resonance imaging apparatus comprising:
- static magnetic field generation means configured to generate a static magnetic field in an imaging space in which an object to be examined is placed;
gradient magnetic field generation means configured to generate a gradient magnetic field formed in X-axis direction, Y-axis direction and Z-axis direction in the imaging space;
high-frequency magnetic field generation means configured to generate a high-frequency magnetic field in the imaging space;
reception means configured to receive a nuclear magnetic resonance signal generated from the object;
signal processing means configured to reconstruct a magnetic resonance image based on the nuclear magnetic resonance signal received by the reception means; and
control means configured to control the gradient magnetic field generation means, the high-frequency magnetic field generation means, the reception means and the signal processing means,characterized in further comprising;
approximation means configured to approximate the output error of the gradient magnetic field with respect to the respective directions of the gradient magnetic field using the combination of multiple parameter values;
evaluation means configured to evaluate combination of the multiple parameter values based on image quality of the reconstructed magnetic resonance image considering the output error of the gradient magnetic field approximated by the approximation means; and
determination means configured to determine a desired combination from among the combinations of the multiple parameter values based on the evaluation result by the evaluation means.
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Abstract
Disclosed is a magnetic resonance imaging apparatus comprising static magnetic field generation means, gradient magnetic field generation means, high-frequency magnetic field generation means, reception means, signal processing means, and control means which controls the gradient magnetic field generation means, the high-frequency magnetic field generation means, the reception means, and the signal processing means, wherein said apparatus comprises: approximation means that approximates the output error of the gradient magnetic field using a combination of multiple parameter values with respect to each direction of the gradient magnetic field; evaluation means that evaluates the combinations of multiple parameter values based on the image quality of a magnetic resonance image that is reconstructed while taking into account the output error of the gradient magnetic field that has been approximated by the approximation means; and determination means that, based on the result of the evaluation by the evaluation means, determines a desired combination among the combinations of multiple parameter values.
27 Citations
15 Claims
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1. A magnetic resonance imaging apparatus comprising:
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static magnetic field generation means configured to generate a static magnetic field in an imaging space in which an object to be examined is placed; gradient magnetic field generation means configured to generate a gradient magnetic field formed in X-axis direction, Y-axis direction and Z-axis direction in the imaging space; high-frequency magnetic field generation means configured to generate a high-frequency magnetic field in the imaging space; reception means configured to receive a nuclear magnetic resonance signal generated from the object; signal processing means configured to reconstruct a magnetic resonance image based on the nuclear magnetic resonance signal received by the reception means; and control means configured to control the gradient magnetic field generation means, the high-frequency magnetic field generation means, the reception means and the signal processing means, characterized in further comprising; approximation means configured to approximate the output error of the gradient magnetic field with respect to the respective directions of the gradient magnetic field using the combination of multiple parameter values; evaluation means configured to evaluate combination of the multiple parameter values based on image quality of the reconstructed magnetic resonance image considering the output error of the gradient magnetic field approximated by the approximation means; and determination means configured to determine a desired combination from among the combinations of the multiple parameter values based on the evaluation result by the evaluation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A magnetic resonance imaging method for reducing artifacts generated due to the output error of gradient magnetic fields, comprising:
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(1) a step that approximates the output error of the gradient magnetic field in the respective directions of the gradient magnetic field using the combination of multiple parameter values; (2) a step that evaluates the combination of the multiple parameter values based on image quality of the reconstructed magnetic resonance image considering the output error of the gradient magnetic field approximated by the step (1); and (3) a step that determines a desired combination from among the combinations of the multiple parameter values based on the evaluation result by the step (2). - View Dependent Claims (15)
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Specification