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A representative respiratory waveform using the initial phase of each 3D radial free induction decay (FID) from a neonatal ultrashort echo-time (UTE) MRI scan, shown over a 3 s duration, with a temporal resolution of 5 ms. Data acquired during the 12.5% of the respiratory cycle associated with endexpiration (pink) and end-inspiration (green) were binned to reconstruct respiratory-gated UTE MR images.
