da Silva, Rubem A.

Fonoff, Erich T.

Freire, Raimundo C.S.

Luana Vidal, Thais

Marcolin, Marco A.

Martins, Viviane S.G.

Neto, Arlindo G.S.B.

Tejo, Francisco de A.F.

UPCommons. Portal del coneixement obert de la UPC

19TH IMEKO TC-4 Measurements of Electrical Quantities32   Noninvasive System of Transcranial Magnetic Stimulation Focused and Deep  Model of Errors Caused by Discrepancies of Input Channels in Multiresolution ADCViviane S. G. Martins54, Francisco de A. F. Tejo54, Raimundo C. S. Freire54, Rubem A. da Silva54, Arlindo G. S. B. Neto79, Marco A. Marcolin80, Erich T. Fonoff80, Thais Luana Vidal54Miroslav Kamenský81, Karol Kovác81, Gabriel Války81The Transcranial Magnetic Stimulation (TMS) is a non-invasive stimulation process which induces an electric field in the brain, to excite or inhibit groups of neurons. However, the current technology reaches only the motor cortex, about 1.5 cm deep, greatly restricting the areas of stimulation. This paper pro-poses new geometries of TMS to reach further internal brain structures, such as the basal ganglia, with improved focality.Multiresolution analog-to-digital converter (MRADC) is ob-viously used in Time domain electromagnetic interference (TDEMI) measuring system for very fast signal sampling with sufficient dynamic range. TDEMI system offers quick investi-gation of EMI spectrum, which is necessary for mass produc-tion EMI testing. Properties of resulting spectrum influenced by imperfections in MRADC are analyzed in the paper. Errors being analyzed are incurred by circuits used in parallel input channels typical for MRADC. Extended mathematical error model has been created covering both slope and offset dis-crepancies of input channels.Keywords- multiresolution quantization, time domain EMI measurement, offset and slope errors, spectrum measure-ment.Modelling of errors of MRADC system:Sketch of COS model formation based on time domain pulsesPicture representing a TMS system.09BM163 10EM046

Noninvasive system of transcranial magnetic stimulation focused and deep

Noninvasive system of transcranial magnetic stimulation focused and deep

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