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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: J Magn Reson Imaging. 2018 Oct 25;49(5):1475–1488. doi: 10.1002/jmri.26325

FIG. 4.

FIG. 4.

Comparison of relative error in R2* measurements (i.e., accuracy) for 3 signal models by varying UTE-A acquisition parameters as a function of SNR (top row), ∆TE (middle row), and TEmax (bottom row). SNR was held at 50 for varying ∆TE and TEmax. Noise subtraction and quadratic models showed high accuracy for varying acquisition parameters, except for high R2* values obtained for the longest ∆TE of 1.8 ms. The constant offset model overestimated R2* for the lowest SNR and for high R2* values obtained using longer ∆TEs (≥1ms), and R2* results were dependent on TEmax.