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- W3089456674 abstract "The purpose of this study is to develop a method for the Bloch image simulation of biological tissues including various chemical components and T2* distribution. The nuclear spins in the object material were modeled as a spectral intensity function Sr→ω defined by superposition of Lorentz functions with various central precession frequencies and the half width of 1/(πT2′), where 1/T2′ is a relaxation rate attributable to microscopic field inhomogeneity in a voxel. Four-dimensional numerical phantoms were created to simulate Sr→ω and used for MRI simulations of the phantoms containing water and fat protons. Single slice multiple (16) gradient-echo sequences (ΔTE = 2.2 and 1.384 ms) were used for experiments at 1.5 T and 3 T and MRI simulations to evaluate the validity of the approach. Experimentally measured image intensities of the multiple gradient-echo imaging sequences were well reproduced by the MRI simulations. The correlation coefficients between the experimentally measured image intensities and those numerically simulated were 0.9895 to 0.9992 for the 4-component phantom at 1.5 T and 0.9580 to 0.9996 for the 7-component phantom at 3 T. T2* and chemical shift effects were successfully implemented in the MRI simulator (BlochSolver). Because this approach can be applied to other MRI simulators, the method developed in this study is useful for MRI simulation of biological tissues containing water and fat protons." @default.
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- W3089456674 date "2020-12-01" @default.
- W3089456674 modified "2023-09-23" @default.
- W3089456674 title "Development of a method for the Bloch image simulation of biological tissues" @default.
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- W3089456674 doi "https://doi.org/10.1016/j.mri.2020.09.024" @default.
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