Figure 7.
Comparison between anatomical images (left-hand panels) and ADC maps (right) collected on a human breast-scan volunteer. (A) Multi-scan T2 turbo spin echo image. (B) Axial slice, twice-refocused EPI. (C) Single-slice SPEN (sequence in Fig. 2B). The corresponding ADC maps (D, E) were originally weighted by bPGSE-values 0 250 500 750 1000, arising from δ= 26.3 ms, ∆ = 43.4 ms. In the SPEN case, corrected b-values were used to derive the maps. Scanning parameters for the multi-scan image: cubic FOV= 360 mm on each side; resolution = 0.8×0.6 mm2 on a 2.5 mm slice; total scan duration = 1080ms (without fat suppression). For EPI: square FOV = 360x360 mm2, resolution = 1.9×1.9 mm2, 2.5 mm slice, total scan duration (with GRAPPA parallel imaging, not used in the SPEN case) = 150 ms. SPEN parameters: FOV = 300×120 mm2, resolution = 1.6×1.6 mm2 on a 2.5 mm slice, T90 = 47.8 ms, Ge = 0.06 G/cm, Ta = 66.1 ms and Ga = 0.043 G/cm, total scan duration = 200ms . For both EPI and SPEN, fat suppression was used.