Fig. 3

3D isosurface plots of the space-dependent probe absorption in the presence of the NDD effect for the scheme -I with isovalue = 0.6. (a) \(R_{10}\) = 0, \(\phi\) = 0; (b) \(R_{10}\) = 0, \(\phi\) = 0.219\(\pi\); (c) \(R_{10}\) = 0.001 MHz, \(\phi\) = 0.219\(\pi\); (d) \(R_{10}\) = 0.001 MHz, \(\phi\) = 0.221\(\pi\). Other common parameters: C = 9, \(R_1\) = \(R_2\) = 1.6 MHz, \(R_3\) = 1.13 MHz, \(\Delta _p\) = 4.2 MHz, \(\Delta _1\) = \(\Delta _2\) = 0.