@inproceedings{daa34ca421014599a4a86531c4e9f53a,
title = "Model-free optimal de-drifting and enhanced detection in fMRI data",
abstract = "Discriminating between active and non-active brain voxels in noisy functional magnetic resonance imaging (fMRI) data plays an important role when investigating task-related activations of the neuronal sites. A novel method for efficiently capturing drifts in the functional magnetic resonance imaging (fMRI) data is presented that leads to enhanced fMRI activation detection. The proposed algorithm apply a first order differencing to the fMRI time series samples in order to remove the drift effect. Using linear least-squares, a consistent hemodynamic response function (HRF) of the fMRI voxel is estimated as a first-step that leads to an optimal estimate of the drift based on a wavelet thresholding technique. The de-drifted fMRI voxel response is then obtained by removing the estimated drift from the fMRI time-series. Its performance is assessed using a visual task real fMRI data set. The application results reveal that the proposed method, which avoids the selection of a model to remove the drift component, leads to an improved activation detection performance in fMRI data.",
keywords = "activation detection, consistent estimation, functional MRI, optimal de-drifting",
author = "Adnan Shah and Seghouane, \{Abd Krim\}",
year = "2013",
doi = "10.1109/MLSP.2013.6661963",
language = "English",
isbn = "9781479911806",
series = "IEEE International Workshop on Machine Learning for Signal Processing, MLSP",
booktitle = "2013 IEEE International Workshop on Machine Learning for Signal Processing - Proceedings of MLSP 2013",
note = "2013 16th IEEE International Workshop on Machine Learning for Signal Processing, MLSP 2013 ; Conference date: 22-09-2013 Through 25-09-2013",
}