cardioX: Short-Time Localized Sliding Estimate of Cardiac Component for Physiological Noise Removal in fMRI

Christine Law¹

The conventional technique for physiological noise reduction in fMRI uses Fourier analysis over long duration usually spanning the entire record. We propose, instead, a sliding window technique (cardioX) that more closely approximates the cardiac component variation over the short term. CardioX removes more cardiac energy in its frequency band than the coventional method.