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An inverse problem approach to the correction of distortion in epi images (2000)
| Content Provider | CiteSeerX |
|---|---|
| Author | Munger, Patrice Crelier, Gerard R. Peters, Terry M. Pike, G. Bruce |
| Abstract | Abstract—Magnetic resonance imaging using the echo planar imaging (EPI) technique is particularly sensitive to main @ HA field inhomogeneities. The primary effect is geometrical distortion in the phase encoding direction. In this paper, we present a method based on the conjugate gradient algorithm to correct for this geometrical distortion, by solving the EPI imaging equation. Two versions are presented: one that attempts to solve the full four-dimensional (4-D) imaging equation, and one that independently solves for each profile along the blip encoding direction. Results are presented for both phantom and in vivo brain EPI images and compared with other proposed correction methods. Index Terms—Conjugate gradient method, distortion, echo-planar imaging (EPI), image processing, magnetic resonance imaging (MRI), reconstruction. I. |
| File Format | |
| Volume Number | 19 |
| Journal | IEEE Trans. on Medical Imaging |
| Language | English |
| Publisher Date | 2000-01-01 |
| Access Restriction | Open |
| Subject Keyword | Inverse Problem Approach Epi Image Geometrical Distortion Epi Imaging Equation Index Term Conjugate Gradient Method Echo Planar Imaging Conjugate Gradient Algorithm Correction Method Main Ha Field Inhomogeneity Echo-planar Imaging Primary Effect Magnetic Resonance Imaging Image Processing Vivo Brain Epi Image Abstract Magnetic Resonance |
| Content Type | Text |
| Resource Type | Article |
