Figure 6

Theoretical stent's temperature in the MRI examination. (a) The time-dependent stent’s temperature T _s (t) given by Equation 8. The start of the rf irradiation is marked by an arrow on the time axis. The time-dependent blood temperature T _b (t) exiting the stent has the same form, except that the steady-state temperature increase is reduced to εΔT with 0 ≤ ε ≤ 1. (b) Radial distribution of the temperature T(r) within the vessel wall surrounding the stent (0 ≤ r ≤ d) in the steady state, as given by Equation 11. At the contact surface to the stent, the vessel wall heats up to the stent temperature, T(r = 0) = T _s , whereas at the vessel’s outer surface, the temperature drops to the body temperature, T(r = d) = T ₀, via a ln(1 + r/R) radial dependence.