Correction of MR images for motion artifacts using navigator echoes and autocorrection
AssigneeMayo Foundation for Medical Education and Research
InventorsRichard L. Ehman, Joel P. Felmlee, Armando Manduca, Kiaran P. McGee
Life of this patent
Estimating the term…
Abstract
Navigator echo signals are acquired during an MRI scan in which image data is acquired. The navigator echo signals are used to estimate an initial correction of the acquired image data for patient motion during the scan. The initially corrected image data is then autocorrected in an iterative process which measures image quality and makes further corrections to the image data until the measured image quality is within tolerance.
Claims9
A method for correcting a medical image for artifacts, the steps comprising:
- a) acquiring a navigator signal;
- b) acquiring a series of views to form an image data set;
- c) comparing the navigator signal with views in the image data set;
- d) correcting the views in the image data set based on the comparison in step c);
- e) reconstructing an image from the acquired image data set;
- f) evaluating the quality of the reconstructed image by calculating a metric based on the image;
- g) iteratively minimizing the metric by making further corrections to views in the image data set and repeating steps e) and f).
A method for correcting an MRI image for artifacts caused by patient motion, the steps comprising:
- a) acquiring an NMR navigator signal which has phase information indicative of patient positioning;
- b) acquiring a k-space image data set as a series of views;
- c) comparing phase information in the NMR navigator signal with phase information in acquired views;
- d) correcting views in the k-space image data set based on the comparison in step c);
- e) reconstructing an MR image from the k-space image data set;
- f) evaluating the quality of the MR image by calculating a metric based on the MR image;
- g) iteratively minimizing the metric by making further corrections to views in the k-space image data set and repeating steps e) and f).
Dependencies are inferred from the claim text.