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Generic Magnetic Resonance Imaging Gradient Delay Correction Method for Radial and Spiral Acquisitions
Vanderbilt researchers have developed a way to correct for ubiquitous gradient delay errors in radial and spiral MRI data using only the data necessary to acquire the images. No extra data is required and no special scan must be done to perform the corrections using this unique method.
• Gradient delays and eddy currents can cause differences between specified and acquired k-space trajectories, causing errors and leading to image degradation. Gradient inhomogeneity problems are exacerbated in radial scans
• Current scanners use readout profile alternation to correct for gradient delays in radial and spiral data
• Correction for gradient delays is not possible with new golden angle (a spatial sampling method) scans or when chemical shift effects (dislocation of protons by Fourier transformation when converting from frequency to spatial domain) are important
• Traditionally, data is acquired in a special way and these errors are inferred, but that requirement cannot be met for all scans.
• Method can be integrated into MR scanner acquisition sequence with no noticeable increase in time
• Correction of gradient delay errors in MRI data when other methods are unavailable or impractical
• Ability to correct gradient delay errors using acquired data itself
• Eliminates need for extra data collection or special scanning or calibration to perform corrections
Intellectual Property Status
Figure 1. Uncorrected phantom images (above) and phantom images corrected with the proposed invention (below)