Fig. 4.

Schematic of the qBOLD model describing the transverse MR signal decay in the presence of a blood vessel network. ${\mathrm{R}}_2^{{}^{\prime }}$ is inferred from the long-term regime, and DBV is inferred from the mismatch between the linear intercept of this fit and spin echo signal (t = 0 ms). [Modified from Stone and Blockley (2017)]