scale_amp_molar {spant}

Apply water reference scaling to a fitting results object to yield metabolite quantities in millimolar (mM) units (mol / Litre of tissue).

Description

See the LCModel manual (section 10.2) on water-scaling for details on the assumptions and relevant references. Use this type of concentration scaling to compare fit results with LCModel and TARQUIN defaults. Otherwise scale_amp_molal_pvc is generally the preferred method.

Usage

scale_amp_molar(fit_result, ref_data, w_att = 0.7, w_conc = 35880, ...)

Arguments

fit_result

a result object generated from fitting.

ref_data

water reference MRS data object.

w_att

water attenuation factor (default = 0.7). Assumes water T2 of 80ms and a TE = 30 ms. exp(-30ms / 80ms) ~ 0.7.

w_conc

assumed water concentration (default = 35880). Default value corresponds to typical white matter. Set to 43300 for gray matter, and 55556 for phantom measurements.

...

additional arguments to get_td_amp function.

Value

a fit_result object with a rescaled results table.