Characterization of and correction for artifacts in linogram MRI.
Chemical shift differences, field inhomogeneity, and gradient nonlinearity result in artifacts in magnetic resonance imaging. Three artifacts are characterized for linogram imaging and it is shown that, based on computer simulations and theory, linogram MRI behaves similarly to 2DFT. A correction technique similar to a scheme for 2DFT imaging based on the Dixon technique and coordinate transform methods is proposed. The algorithm is applied to correct for field inhomogeneity and gradient nonlinearity-induced artifacts in both simulations and images of a clinical phantom. The results show good correlation with the theory. It is concluded that linogram imaging offers certain attractive features of both 2DFT and PR imaging techniques, and is a potentially viable alternative to PR imaging in the presence of field inhomogeneity.
Gai
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Department of Radiology, University of Pennsylvania, Philadelphia 19104, USA.
Axel
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D000273:Adipose Tissue; D000465:Algorithms; D016477:Artifacts; D001834:Body Water; D001921:Brain / Q000033:anatomy & histology; D003198:Computer Simulation; D019327:Copper Sulfate; D005583:Fourier Analysis; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D011522:Protons
D011522:Protons; D019327:Copper Sulfate