Effects of lung volume and scan plane on (a,c) fractional lung water density and (b,d) T2*. The results are from data acquired at RV, FRC, and TLC for a maximum TE2 (3.4 msec at RV, 2.4 msec at FRC, and 1.8 msec at TLC). There was a significant main effect for lung volume at P <0.0001.