Data-driven haemodynamic response function extraction using Fourier-wavelet regularised deconvolution.

BMC Medical Imaging
Alle Meije WinkJos B T M Roerdink

Abstract

We present a simple, data-driven method to extract haemodynamic response functions (HRF) from functional magnetic resonance imaging (fMRI) time series, based on the Fourier-wavelet regularised deconvolution (ForWaRD) technique. HRF data are required for many fMRI applications, such as defining region-specific HRFs, effciently representing a general HRF, or comparing subject-specific HRFs. ForWaRD is applied to fMRI time signals, after removing low-frequency trends by a wavelet-based method, and the output of ForWaRD is a time series of volumes, containing the HRF in each voxel. Compared to more complex methods, this extraction algorithm requires few assumptions (separability of signal and noise in the frequency and wavelet domains and the general linear model) and it is fast (HRF extraction from a single fMRI data set takes about the same time as spatial resampling). The extraction method is tested on simulated event-related activation signals, contaminated with noise from a time series of real MRI images. An application for HRF data is demonstrated in a simple event-related experiment: data are extracted from a region with significant effects of interest in a first time series. A continuous-time HRF is obtained by fitting a no...Continue Reading

References

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Citations

Jun 14, 2013·Computational and Mathematical Methods in Medicine·Yu LeiBin Yan
Jun 11, 2015·Journal of Integrative Neuroscience·Xi ZhuBen H Jansen
Dec 23, 2014·IEEE Transactions on Medical Imaging·Karthik Ramakrishnan SreenivasanGopikrishna Deshpande
Jul 29, 2015·Neural Networks : the Official Journal of the International Neural Network Society·Paolo AvesaniDiego Sona
Jul 7, 2011·NeuroImage·Michael BarnathanFeroze B Mohamed
Feb 2, 2017·Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism·Rebecca J WilliamsG Bruce Pike

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Software Mentioned

SUREShrink
Coiflets
ForWaRD
Matlab
SPM2

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