Magnetic resonance image correction method and magnetic resonance imaging apparatus using the same
First Claim
Patent Images
1. A method for magnetic resonance image correction comprising the steps of:
- subjecting a reference magnetic resonance T2 image and a second magnetic resonance T2 * image to a fast Fourier transform;
calculating a cross-correlation between the reference magnetic resonance T2 * image and the second magnetic resonance T2 * image,calculating scale and rotation correction values for the second magnetic resonance T2 * image comprising scale and rotation deviation values of said second magnetic resonance T2 * image relative to said reference magnetic resonance T2 * image,correcting said second magnetic resonance T2 * image using the scale and rotation correction values to produce a scale/rotation-corrected second magnetic resonance T2 * image,subjecting the scale/rotation-corrected second magnetic resonance T2 * image to a fast Fourier transform,calculating a cross-correlation between the reference magnetic resonance T2 * image and the scale/rotation-corrected second magnetic resonance T2 * image,calculating a position correction value for the scale/rotation-corrected second magnetic resonance T2 * image comprising a position deviation value of the scale/rotation-corrected second magnetic resonance T2 * image relative to the reference magnetic resonance T2 * image, andcorrecting the scale/rotation-corrected second magnetic resonance T2 * image using the position correction value to produce a position-corrected second magnetic resonance T2 * image.
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Abstract
Cross-correlation between a first magnetic resonance image as a reference image and a second magnetic resonance image to be adjusted relative to the first magnetic resonance image is taken, deviation of the second magnetic resonance image to the first magnetic resonance image as correction values is calculated, and the second magnetic resonance image based on the correction values is corrected.
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Citations
14 Claims
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1. A method for magnetic resonance image correction comprising the steps of:
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subjecting a reference magnetic resonance T2 image and a second magnetic resonance T2 * image to a fast Fourier transform; calculating a cross-correlation between the reference magnetic resonance T2 * image and the second magnetic resonance T2 * image, calculating scale and rotation correction values for the second magnetic resonance T2 * image comprising scale and rotation deviation values of said second magnetic resonance T2 * image relative to said reference magnetic resonance T2 * image, correcting said second magnetic resonance T2 * image using the scale and rotation correction values to produce a scale/rotation-corrected second magnetic resonance T2 * image, subjecting the scale/rotation-corrected second magnetic resonance T2 * image to a fast Fourier transform, calculating a cross-correlation between the reference magnetic resonance T2 * image and the scale/rotation-corrected second magnetic resonance T2 * image, calculating a position correction value for the scale/rotation-corrected second magnetic resonance T2 * image comprising a position deviation value of the scale/rotation-corrected second magnetic resonance T2 * image relative to the reference magnetic resonance T2 * image, and correcting the scale/rotation-corrected second magnetic resonance T2 * image using the position correction value to produce a position-corrected second magnetic resonance T2 * image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A magnetic resonance imaging apparatus comprising:
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a magnetostatic field-forming magnet for applying a uniform magnetostatic field to a body to be tested; a gradient magnetic field-forming coil for applying a gradient magnetic field to said body to be tested; means for applying radio frequency magnetic field to said body to be tested; means for receiving a plurality of magnetic resonance signals from said body to be tested obtained according to the application of said radio frequency magnetic field; means for forming an image from said plurality of magnetic resonance signals; means for obtaining a reference magnetic resonance T2 * image and a second magnetic resonance T2 * image using said means for forming an image; scale/rotation correction means for calculating a cross-correlation between the reference magnetic resonance T2 * image and the second magnetic resonance T2 * image, calculating scale and rotation correction values for the second magnetic resonance T2 * image comprising scale and rotation deviation values of said second magnetic resonance T2 * image relative to said reference magnetic resonance T2 * image, and correcting said second magnetic resonance T2 * image using the scale and rotation correction values to produce a scale/rotation-corrected second magnetic resonance T2 * image, position correction means for calculating a cross-correlation between the reference magnetic resonance T2 * image and the scale/rotation-corrected second magnetic resonance T2 * image, calculating a position correction value for the scale/rotation-corrected second magnetic resonance T2 * image comprising a position deviation value of the scale/rotation-corrected second magnetic resonance T2 * image relative to the reference magnetic resonance T2 * image, and correcting the scale/rotation-corrected second magnetic resonance T2 * image using the position correction value to produce a position-corrected second magnetic resonance T2 * image, and means for displaying the position-corrected second magnetic resonance T2 * image. - View Dependent Claims (11, 12, 13, 14)
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Specification