Figure 1. Representative19Fluorine head images (left) at 2.5 (top), 7.5 (middle), and 62 (bottom) min, respectively, after the onset of sevoflurane administration. Corresponding1Hydrogen images (right) are displayed for anatomic reference. The19Fluorine image at 2.5 min was the sum of five coronal slices of a three-dimensional data set, which had a final size of 128 x 128 x 32 and a field of view (FOV) of 4 x 4 x 4 cm3. The other two19Fluorine images were obtained using the two-dimensional sequence of Figure 5in the Appendix, with a slice thickness of 7 mm and an FOV of 6 x 6 cm2.