A Novel Spectrum Contrast Mapping Method for Functional Magnetic Resonance Imaging Data Analysis.

ABSTRACT: Many studies reported that spontaneous fluctuation of the blood oxygen level-dependent signal exists in multiple frequency components and changes over time. By assuming a reliable energy contrast between low- and high-frequency bands for each voxel, we developed a novel spectrum contrast mapping (SCM) method to decode brain activity at the voxel-wise level and further validated it in designed experiments. SCM consists of the following steps: first, the time course of each given voxel is subjected to fast Fourier transformation; the corresponding spectrum is divided into low- and high-frequency bands by given reference frequency points; then, the spectral energy ratio of the low- to high-frequency bands is calculated for each given voxel. Finally, the activity decoding map is formed by the

SUBMITTER: Yu Q 

PROVIDER: S-EPMC8455948 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature