Renal longitudinal relaxation time (T1) is an established indicator of pathophysiological tissue status. We have applied image registration techniques to correct for motion during saturation recovery (SR) acquisitions with multiple recovery times used for T1 mapping in kidneys of paediatric patients. All registration techniques were successful in improving the intra and inter-session repeatability of the T1 estimates, as well as the quality of the underlying saturation recovery fits on a challenging patient population, as assessed by intra- and inter-scan repeatability and analysis of the root mean squared error of the SR fits.
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