scale_amp_molal_pvc: 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 / kg of tissue water).

Description

Details of this method can be found in "Use of tissue water as a concentration reference for proton spectroscopic imaging" by Gasparovic et al MRM 2006 55(6):1219-26. 1.5 Tesla relaxation assumptions are taken from this paper. For 3 Tesla data, relaxation assumptions are taken from "NMR relaxation times in the human brain at 3.0 Tesla" by Wansapura et al J Magn Reson Imaging 1999 9(4):531-8.

Usage

scale_amp_molal_pvc(fit_result, ref_data, p_vols, te, tr, ...)

Arguments

fit_result	result object generated from fitting.
ref_data	water reference MRS data object.
p_vols	a numeric vector of partial volumes expressed as percentages. For example, a voxel containing 100% white matter tissue would use : p_vols = c(WM = 100, GM = 0, CSF = 0).
te	the MRS TE in seconds.
tr	the MRS TR in seconds.
...	additional arguments to get_td_amp function.

Value

A fit_result object with a rescaled results table.

spant documentation built on Sept. 11, 2024, 9:13 p.m.