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• W2147927957 startingPage "169" @default.
• W2147927957 abstract "Metallic implants in MRI cause spin-echo (SE) images to be distorted in the slice and frequency-encoding directions. Chang and Fitzpatrick (IEEE Trans Med Imaging 1992;11:319-329) proposed a distortion correction method (termed the CF method) based on the magnitude images from two SE acquisitions that differ only in the polarity of the frequency-encoding and slice-selection gradients. In the present study we solved some problems with the CF method, primarily by modeling the field inhomogeneities as a single 3D displacement field built by 3D cubic B-splines. The 3D displacement field was applied in the actual distortion direction in the slice/frequency-encoding plane. To account for patient head motion, a 3D rigid body motion correction was also incorporated in the model. Experiments on a phantom containing an aneurysm clip showed that the knot spacing between the B-splines is a very important factor in both the final image quality and the processing speed. Depending on the knot spacing and the image volume size, the number of unknowns range from a few thousands to over 100,000, leading to processing times ranging from minutes to days. Optimal knot spacing, a means of increasing the processing speed, and other parameters are investigated and discussed." @default.
• W2147927957 created "2016-06-24" @default.
• W2147927957 creator A5067061176 @default.
• W2147927957 creator A5071198636 @default.
• W2147927957 date "2005-06-20" @default.
• W2147927957 modified "2023-10-13" @default.
• W2147927957 title "Correction of MR image distortions induced by metallic objects using a 3D cubic B-spline basis set: Application to stereotactic surgical planning" @default.
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• W2147927957 doi "https://doi.org/10.1002/mrm.20528" @default.
• W2147927957 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15968661" @default.
• W2147927957 hasPublicationYear "2005" @default.
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