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METHOD AND MAGNETIC RESONANCE APPARATUS CORRECTION OF MULTIPLE DISTORTION EFFECTS DURING MAGNETIC RESONANCE IMAGING
METHOD AND MAGNETIC RESONANCE APPARATUS CORRECTION OF MULTIPLE DISTORTION EFFECTS DURING MAGNETIC RESONANCE IMAGING
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机译:磁共振成像期间多重畸变效应的方法和磁共振装置校正
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摘要
Magnetic resonance (MR) data are acquired from a volume segment of an examination object and an MR image composed of multiple image pixels is reconstructed therefrom. For a magnetic field assumed to have been generated by the scanner, a summed field deviation is calculated, from which a respective displacement vector is calculated for each image pixel. A signal portion is assigned to each image pixel that has been displaced with the respective displacement vector from the respective image pixel. The summed field deviation is the sum of deviations caused by at least two of: non-linearities in gradient coils, Maxwell fields, field inhomogeneities independent of the gradients, and dynamic field disturbances.
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