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• W2029123845 abstract "Abstract A novel linear parameterization for the variable flip angle method for longitudinal relaxation time T 1 quantification from spoiled steady state MRI is derived from the half angle tangent transform, τ, of the flip angle. Plotting the signal S at coordinates x = Sτ and y = S /τ, respectively, establishes a line that renders signal amplitude and relaxation term separately as y ‐intercept and slope. This representation allows for estimation of the respective parameter from the experimental data. A comprehensive analysis of noise propagation is performed. Numerical results for efficient optimization of longitudinal relaxation time and proton density mapping experiments are derived. Appropriate scaling allows for a linear presentation of data that are acquired at different short pulse repetition times, TR << T1 thus increasing flexibility in the data acquisition by removing the limitation of a single pulse repetition time. Signal bias, like due to slice‐selective excitation or imperfect spoiling, can be readily identified by systematic deviations from the linear plot. The method is illustrated and validated by 3T experiments on phantoms and human brain. Magn Reson Med, 2011. © 2011 Wiley‐Liss, Inc." @default.
• W2029123845 created "2016-06-24" @default.
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• W2029123845 date "2011-03-22" @default.
• W2029123845 modified "2023-10-10" @default.
• W2029123845 title "Identification of signal bias in the variable flip angle method by linear display of the algebraic ernst equation" @default.
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• W2029123845 doi "https://doi.org/10.1002/mrm.22849" @default.
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