Absolute error in Yv for an infinitely long cylinder, plotted as a function of the vessel angle, θ, for different values of δθ. The various curves are calculated using Eq. (7) for which the following parameters were used: Hct=0.44, Δχdo = 4 · π · 0.27 ppm, TE = 18ms, Bo = 3 Tesla and Yv=70%. The curves are plotted for 6 different values of δθ, ±1°, ±12° and ±20° closely matching the parameters in the simulations.