The effect on ΔT is shown versus particle radius with varying magnetic field amplitudes (a) without MRI due to an alternating-sinusoidal magnetic field, (b) with a 0.2 T MRI field, an alternating-sinusoidal magnetic field, and, (c) with a 0.2 T MRI field, a rotating magnetic field. Again, the RF frequency is 300 kHz, τ is a function of nanoparticle radius, as plotted in Figure 1 and nanoparticle concentration is ϕ = 0.005. A 1 cm radius tumor is considered throughout.