TY - JOUR
T1 - Conjugate phase MRI reconstruction with spatially variant sample density correction
AU - Noll, Douglas C.
AU - Fessler, Jeffrey A.
AU - Sutton, Bradley P.
N1 - Manuscript received August 30, 2004; November 15, 2004. This work was supported in part by the National Institutes of Health (NIH) under Grant R01 DA015410. The Associate Editor responsible for coordinating the review of this paper and recommending its publication was X. Hu. Asterisk indicates corresponding author. *D. C. Noll is with the Department of Biomedical Engineering, University of Michigan, 1107 Carl A. Gerstacker, 2200 Bonisteel Blvd, Ann Arbor, MI 48109-2099 USA (e-mail: [email protected]).
PY - 2005/3
Y1 - 2005/3
N2 - A new image reconstruction method to correct for the effects of magnetic field inhomogeneity in non-Cartesian sampled magnetic resonance imaging (MRI) is proposed. The conjugate phase reconstruction method, which corrects for phase accumulation due to applied gradients and magnetic field inhomogeneity, has been commonly used for this case. This can lead to incomplete correction, in part, due to the presence of gradients in the field inhomogeneity function. Based on local distortions to the k-space trajectory from these gradients, a spatially variant sample density compensation function is introduced as part of the conjugate phase reconstruction. This method was applied to both simulated and experimental spiral imaging data and shown to produce more accurate image reconstructions. Two approaches for fast implementation that allow the use of fast Fourier transforms are also described. The proposed method is shown to produce fast and accurate image reconstructions for spiral sampled MRI.
AB - A new image reconstruction method to correct for the effects of magnetic field inhomogeneity in non-Cartesian sampled magnetic resonance imaging (MRI) is proposed. The conjugate phase reconstruction method, which corrects for phase accumulation due to applied gradients and magnetic field inhomogeneity, has been commonly used for this case. This can lead to incomplete correction, in part, due to the presence of gradients in the field inhomogeneity function. Based on local distortions to the k-space trajectory from these gradients, a spatially variant sample density compensation function is introduced as part of the conjugate phase reconstruction. This method was applied to both simulated and experimental spiral imaging data and shown to produce more accurate image reconstructions. Two approaches for fast implementation that allow the use of fast Fourier transforms are also described. The proposed method is shown to produce fast and accurate image reconstructions for spiral sampled MRI.
KW - Image reconstruction
KW - Magnetic field inhomogeneity
KW - Magnetic resonance imaging
KW - Spiral imaging
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U2 - 10.1109/TMI.2004.842452
DO - 10.1109/TMI.2004.842452
M3 - Article
C2 - 15754983
AN - SCOPUS:14744291655
SN - 0278-0062
VL - 24
SP - 325
EP - 336
JO - IEEE transactions on medical imaging
JF - IEEE transactions on medical imaging
IS - 2
ER -