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Figure 6d: ADC maps derived from coronal sections acquired with diffusion-weighted ³He MR imaging (8/4.5, 128 x 128 matrix, 1.5-cm section thickness, 7° flip angle). (a) Subject 1. ADC (0.166 cm²/sec) map in nonsmoker (Table 2) with (b) histogram for the typical section. (c) Subject 14. ADC map (0.268 cm²/sec) in smoker (Table 2) with (d) histogram for the typical section. Whole-lung mean ADC values are reported in Table 2. Graduated color bars represent values in squared millimeters per second.