Subtraction Research Papers - Academia.edu (original) (raw)

M. Negishi, R. T. Constable Diagnostic Radiology, Yale University, School of Medicine, New Haven, CT, United States, Biomedical Engineering and Neurosurgery, Yale University, School of Medicine, New Haven, CT, United States Introduction... more

M. Negishi, R. T. Constable Diagnostic Radiology, Yale University, School of Medicine, New Haven, CT, United States, Biomedical Engineering and Neurosurgery, Yale University, School of Medicine, New Haven, CT, United States Introduction Simultaneous Imaging for Tomographic Electrophysiology (SITE), or simultaneous EEG-fMRI recording, is becoming an important tool for correlating electrophysiological changes with hemodynamic changes in the brain. EEG data recorded during fMRI acquisition is contaminated with large gradient, RF pulse, and cardiac pulse artifacts. Hence, effective artifact removal is essential for SITE. Because RF and gradient artifacts are periodical, they are commonly removed by average waveform subtraction methods. However, since spectra of these artifacts include frequency bands much higher than common EEG sampling rates, average waveform subtraction requires EEG sampling timing correction beforehand. EEG sampling time correction involves recording of exact image a...