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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: Phys Med Biol. 2010 Feb 11;55(5):R1–R63. doi: 10.1088/0031-9155/55/5/R01

Figure 21.

Figure 21

B1 field map (effective flip angle) acquired with the body coil (a) and with the head coil (d). R2 images of a blank unirradiated polymer gel dosimeter acquired with the body coil and head coil are shown in (c) and (f) showing the effect of the inhomogeneous B1 field for the head coil. The field-of-view (FOV) is 320 × 320 mm2. Corresponding longitudinal profiles through the center are also shown (b and e). The plot in figure (g) gives the relation between the change in R2 and the flip angle for a nominal flip angle of 90° (De Deene et al 2000b). Reproduced with permission.