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Effect of bandwidth on signal-to-noise ratio. Three-dimensional spoiled gradient echo axial reformat with a readout bandwidth of (a) 142 kHz, (b) 62.5 kHz and (c) 31.25 kHz in an 18-year-old girl with asthma. Note that lower bandwidth reduces the lung parenchyma signal because of longer echo time, as shown in (c), where the area of trapped air (arrow) in the left lower lobe is less clearly identified than in (a)
