BOLD sensitivity and vessel size specificity along CPMG and GRASE echo trains

Purpose To assess the vessel size specificity and sensitivity of rapid CPMG and GRASE for functional BOLD imaging for different echo train lengths, echo spacings, field strength, and refocusing flip angle schemes. In addition, the behavior of signals acquired before and after the refocusing time points is analyzed. Methods Evolution of magnetization within a network of artificial cylinders is simulated with Monte Carlo methods for all relevant...