BOLD background gradient contributions in diffusion-weighted fMRI--comparison of spin-echo and twice-refocused spin-echo sequences.

The interaction ('cross terms') between diffusion-weighting gradients and susceptibility-induced background gradient fields around vessels has an impact on apparent diffusion coefficient (ADC) measurements and diffusion-weighted functional magnetic resonance imaging (DFMRI) experiments. Monte-Carlo (MC) simulations numerically integrating the Bloch… CONTINUE READING