Simultaneous EEG and ƒMRI Made Easy
نویسنده
چکیده
It is attractive to consider an approach similar to the ballistocadiogram suppression in removal of the gradient artifacts. However, small timing shifts of the digital sampling with respect to the gradient activity will result in incomplete removal of the artifact. With a sampling frequency fs and an artifact frequency (e.g., due to gradients) of f0, sampling errors of = 2πf0/fs are to be expected. With as the residual artifact (the difference between the original and phase shifted signal) it is easy to show that:
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