scale_amp_molar: Apply water reference scaling to a fitting results object to...

In spant: MR Spectroscopy Analysis Tools

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.

spant documentation built on Oct. 23, 2023, 5:06 p.m.