Perform zeroth-order phase correction based on expected baseline regions.

Default arguments are appropriate for water suppressed 1H MRS of the brain. The following options are suitable for a water signal at 4.65 ppm: ppm_start = c(5.2, 4.0), ppm_end = c(5.3, 4.1), xlim = c(5.2, 4.1)

Usage

auto_phase_bl(
  mrs_data,
  ppm_start = c(0.5, 4),
  ppm_end = c(0, 4.2),
  xlim = c(1.8, 4),
  mean_dyns = FALSE,
  ret_phase = FALSE
)

Arguments

mrs_data

an object of class mrs_data.

ppm_start

a vector of ppm values designating baseline regions.

ppm_end

a vectors of ppm values designating baseline regions.

xlim

region containing signal of interest, eg strong metabolite resonances.

mean_dyns

phase the mean spectrum and apply the same value to each dynamic.

ret_phase

return phase values (logical).

Value

MRS data object with corrected phase.