Perform l2 regularisation artefact suppression.

Perform l2 regularisation artefact suppression using the method proposed by Bilgic et al. JMRI 40(1):181-91 2014.

l2_reg(
  mrs_data,
  thresh = 0.05,
  b = 1e-11,
  A = NA,
  xlim = NA,
  thresh_xlim = NULL,
  A_append = NULL,
  ret_norms = FALSE
)

Arguments

mrs_data

input data for artefact suppression.

thresh

threshold parameter to extract lipid signals from mrs_data based on the spectral integration of the thresh_xlim region in magnitude mode.

b

regularisation parameter.

A

set of spectra containing the artefact basis signals. The thresh parameter is ignored when A is specified.

xlim

spectral limits in ppm to restrict the reconstruction range. Defaults to the full spectral width.

thresh_xlim

spectral limits in ppm to integrate for the threshold map.

A_append

additional spectra to append to the A basis.

ret_norms

return the residual norm and solution norms.

Value

l2 reconstructed mrs_data object.