Normalize and Detrend Neuroimaging Data

Combined fast preprocessing: removes volume mean offsets and linear trends in a single efficient operation.

Usage

normalize_detrend(vec, mask = NULL)

Arguments

vec

A NeuroVec object (4D neuroimaging data)

mask

Optional NeuroVol mask. If NULL, uses all non-zero voxels.

Value

A NeuroVec with volume offsets and linear trends removed

Details

Combines normalize_volumes and detrend_time in a single pass for efficiency. The operations are applied in order:

1. Remove volume-wise mean offset

2. Remove linear trend from each voxel's timeseries

Uses fast C++ parallel implementation via RcppParallel.

Examples

if (FALSE) { # \dontrun{
vec <- neuroim2::read_vec("functional.nii.gz")
vec_clean <- normalize_detrend(vec)
} # }