asl2p | R Documentation |
Theoretical models for the acquisition of pulsed ASL data.
See Buxton etal. (1998) for more details.
asl2p(beta, TI, T1b = 1.3, T1 = 1, tau = 1, alpha = 0.9, lambda = 0.9,
Mob = 4095)
asl3p(beta, TI, T1b = 1.3, T1 = 1, alpha = 0.9, lambda = 0.9,
Mob = 100)
beta |
is a vector (lenth = 2 or 3) of kinetic parameters. |
TI |
is a vector of inversion times (TIs) in seconds. |
T1b |
is the longitudinal relaxation time of blood. |
T1 |
is the longitudinal relaxation time of tissue. |
tau |
is the first TI in the second paper (?). |
alpha |
is the fraction of maximum possible change in the longitudinal magnetization that was achieved. |
lambda |
is the equilibrium tissue/blood partition coefficient of water. |
Mob |
is the equilibrium magnetization of arterial blood. |
A theoretical curve of pulsed ASL signal as a function of time.
Brandon Whitcher bjw34032@users.sourceforge.net
Buxton, R.B., Frank, L.R., Wong, E.C., Siewert, B., Warach, S. and Edelman, R.R. (1998) A General Kinetic Model for Quantitative Perfusion Imaging with Arterial Spin Labeling, Magnetic Resonance in Medicine, 40, 383-396.
TI <- seq(0, 3, length=256)
beta <- c(f=0.8, deltaT=0.5)
plot(TI, asl2p(beta, TI), type="l", lwd=2,
xlab="Time (sec)", ylab="Signal", main="Pulsed ASL: Standard Model")
abline(v=1.5, lwd=2, col=2)
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