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• W2126031944 abstract "Abstract Xenon polarization Transfer Contrast (XTC) MRI pulse sequences permit the gas exchange of hyperpolarized xenon‐129 in the lung to be measured quantitatively. However, the pulse sequence parameter values employed in previously published work were determined empirically without considering the now‐known gas exchange rates and the underlying lung physiology. By using a theoretical model for the consumption of magnetization during data acquisition, the noise intensity in the computed gas‐phase depolarization maps was minimized as a function of the gas‐phase depolarization rate. With such optimization the theoretical model predicted an up to threefold improvement in precision. Experiments in rabbits demonstrated that for typical imaging parameter values the optimized XTC pulse sequence yielded a median noise intensity of only about 3% in the depolarization maps. Consequently, the reliable detection of variations in the average alveolar wall thickness of as little as 300 nm can be expected. This improvement in the precision of the XTC MRI technique should lead to a substantial increase in its sensitivity for detecting pathological changes in lung function. Magn Reson Med 57:1099–1109, 2007. © 2007 Wiley‐Liss, Inc." @default.
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• W2126031944 date "2007-05-29" @default.
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• W2126031944 title "XTC MRI: Sensitivity improvement through parameter optimization" @default.
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• W2126031944 doi "https://doi.org/10.1002/mrm.21241" @default.
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