Fig. 4.

Semi-logarithmic plots of signal decay as a function of delay time, t_d, in the excised lung. Data were selected from various anatomical locations as indicated in Fig. 3E: (A) tracheal region (i); (B) major bronchial region (ii); (C) and (D) lung parenchymal regions (iii) and (iv), respectively. Colors are in accordance with Fig. 3E. Linear correlation coefficients, or Pearson's r, and relaxation rates are shown in the annotation for each plot.