BOLD-based fMRI is currently the method of choice for the spatially resolved investigation of neuronal activity, although this technique only allows indirect measurements of activity by evaluating hemodynamic effects. Recently, a spin-lock-based technique for the direct measurement of neuro-electro-magnetic oscillations was presented, which impressively demonstrated imaging of the alpha activity. In the corresponding publication, however, elementary parameters of the spin-lock preparation were specified ad hoc. In the present work it is shown that the choice of these preparation parameters is of essential importance. For example, a clever choice of the spin-lock time can improve and stabilize the signal detection.
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