The measurement equation of the Balloon hemodynamic model (Friston 2002) which represent the BOLD signal is V0[ k1(1 - q) + k2(1-q/v) + k3(1-v)], I saw from different papers that the authors used the BOLD (%) percent change, if I simulated the BOLD signal using the Balloon model (with measurement equation above, a Blocked design example) with the parameters as in Friston 2002, the BOLD signal reach a value of 0.015 but as I said before large numbers of paper used the BOLD (%) which reach a value as I saw from 1 to 1.5.
what is the mathematical relation to calculate the BOLD (%)?
Mohammed,
Far from my area of expertise but please see attached.
Cheers,
Christopher
http://fmriserver.ucsd.edu/tliu/pdf/obata04_transients.pdf
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