Signal for any sequence operating in the linear regime.
Parameters:
S0 (float) – Signal scaling factor (arbitrary units).
R1 (array-like) – Longitudinal relaxation rate in 1/sec.
noise_sdev (float, optional) – standard deviation of the signal noise.
If this is non-zero, the signal is computed from the mean of the
Rician distributions. A noise_sdev=0 has no effect.
Returns:
Signal in arbitrary units, of the same length as R1.
