calc_spec_snr {spant}

Calculate the spectral SNR.

Description

SNR is defined as the maximum signal value divided by the standard deviation of the noise.

Usage

calc_spec_snr(
  mrs_data,
  sig_region = c(4, 0.5),
  noise_region = c(-0.5, -2.5),
  p_order = 2,
  interp_f = 4,
  full_output = FALSE
)

Arguments

mrs_data

an object of class mrs_data.

sig_region

a ppm region to define where the maximum signal value should be estimated.

noise_region

a ppm region to defined where the noise level should be estimated.

p_order

polynomial order to fit to the noise region before estimating the standard deviation.

interp_f

interpolation factor to improve detection of the highest signal value.

full_output

output signal, noise and SNR values separately.

Details

The mean noise value is subtracted from the maximum signal value to reduce DC offset bias. A polynomial detrending fit (second order by default) is applied to the noise region before the noise standard deviation is estimated.

Value

an array of SNR values.