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• W2729161330 endingPage "e3753" @default.
• W2729161330 startingPage "e3753" @default.
• W2729161330 abstract "T2 * mapping offers access to a number of important structural and physiological tissue parameters. It is robust against RF field variations and overall signal scaling. However, T2 * measurement is highly sensitive to magnetic field errors, including perturbations caused by breathing motion at high baseline field. The goal of this work is to assess this issue in T2 * mapping of the brain and to study the benefit of field stabilization by feedback field control. T2 * quantification in the brain was investigated by phantom and in vivo measurements at 7 T. Repeated measurements were made with and without feedback field control using NMR field sensing and dynamic third-order shim actuation. The precision and reliability of T2 * quantification was assessed by studying variation across repeated measurements as well as fitting errors. Breathing effects were found to introduce significant error in T2 * mapping results. Field control mitigates this problem substantially. In a phantom it virtually eliminates the effects of emulated breathing fluctuations in the head. In vivo it enhances the structural fidelity of T2 * maps and reduces fitting residuals along with standard deviation. In conclusion, feedback field control improves the fidelity of T2 * mapping in the presence of field perturbations. It is an effective means of countering bulk susceptibility effects of breathing and hence holds particular promise for efforts to leverage high field for T2 * studies in vivo." @default.
• W2729161330 created "2017-07-14" @default.
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• W2729161330 date "2017-07-05" @default.
• W2729161330 modified "2023-10-13" @default.
• W2729161330 title "Feedback field control improves the precision of <i>T</i> ₂ * quantification at 7 T" @default.
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• W2729161330 doi "https://doi.org/10.1002/nbm.3753" @default.
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