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Cincotta M.,Unit Operativa di Neurologia dellAzienda Sanitaria di Firenze | Giovannelli F.,Unit Operativa di Neurologia dellAzienda Sanitaria di Firenze | Giovannelli F.,University of Florence | Borgheresi A.,Unit Operativa di Neurologia dellAzienda Sanitaria di Firenze | And 6 more authors.
Brain Stimulation | Year: 2010

The stability of hand-held coil positioning with neuronavigated versus conventional transcranial magnetic stimulation (TMS) is still underinvestigated. Eleven operators naïve for neuronavigation were asked to position and maintain a figure-of-eight-shaped coil over a dipole probe placed within of a polystyrene reproduction of the human head and scalp, in correspondence of the right primary motor cortex. Ten monophasic magnetic pulses were delivered at 46% maximal stimulator output (MSO) in two different experimental conditions: (1) assisted by an optically tracked neuronavigational system; and (2) without neuronavigation. With neuronavigated stimulation, both standard deviation and coefficient of variation of the voltages induced in the dipole probe were significantly lower than without neuronavigation. Results were confirmed in four operators performing a longer-lasting experiment using 50 magnetic pulses in each condition, at an intensity of at 40% MSO. Findings show that optically tracked neuronavigation improves the stability of focal coil positioning. © 2010 Elsevier Inc. All rights reserved. Source

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