Fig 4. RF shim values vs. cross sectional body area and RL/AP ratio.

RF shim values power ratio and phase difference vs. (a) cross sectional body area and (b) RL/AP ratio. They do not correlate with cross sectional body area (R² = 0.01, p = 0.2 and R² = 0.01, p = 0.3, respectively), and phase difference does not correlate with AP/RL ratio (R² = 0.04, p = 0.06), but power ratio weakly correlates with AP/RL ratio (R² = 0.05, p<1e-5).