Representative frequency spectra acquired with GE-EPI.

<p>The stimulation frequency was 25 Hz. Displayed are frequency spectra with the range adjusted to the residual time ΔT of 10 ms (<b>a</b>) and SNR maps at the target frequency of 25 Hz (<b>b</b>) for complex (top), magnitude (middle), and phase (bottom) datasets. Each frequency spectrum was acquired in the existence (stimulation) and absence (control) of stimulation (5 nT). The vertical scale of the spectra represents mean SNR of pixels in ROI. Black arrows indicate the peak produced by the stimulation.