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MRI of lung parenchyma is challenging because of the rapid decay of signal by susceptibility effects of aerated lung on routine fast spin-echo sequences. To assess lung signal intensity in children on ultrashort echo-time sequences in comparison to a fast spin-echo technique. We conducted a retrospective study of lung MRI obtained in 30 patients (median age 5years, range 2months to 18years) including 15 with normal lungs and 15 with cystic fibrosis. On a fast spin-echo sequence with radial readout and an ultrashort echo-time sequence, bot