new_snr_fixed_point

Import in python using from mcutils.scripts.non_central_chi.variance import new_snr_fixed_point

mcutils.scripts.non_central_chi.variance.new_snr_fixed_point(current_snr, ncoils, observed_snr)

Computes the next step in the fixed point root finding method

Defined as equation 19 in Koay & Basser (2006, JMR, doi:10.1016/j.jmr.2006.01.016)

Parameters

• current_snr – current best estimate of true signal over true noise

• ncoils – number of coils

• observed_snr – observed signal over noise ratio

Returns

new estimate of true signal over true noise ratio