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J Med Syst. 2010 Feb;34(1):15-24.

Design and construction of a low cost dsPIC controller based repetitive transcranial magnetic stimulator (rTMS).

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Department of Electronic and Computer Education, Faculty of Technical Education, Gazi University, 06500 Teknikokullar, Ankara, Turkey.


In this work, a digital signal peripheral interface controller (dsPIC) based repetitive transcranial magnetic stimulator (rTMS) was designed and tested under low voltages. In addition, some limited knowledge of TMS, especially design parameters and notions concerned with it, also were investigated. The reason employing the dsPIC in the design is that design parameters can effectively be controlled. Pulse width modulation and switching output of the control unit, which is necessary to control the rTMS device, were controlled in a more effective way. The other novelty is that developed system can be used for therapeutic or diagnostic purposes in future work provided by digital signal processing performance of dsPIC. Bounded-cylindrical in shape head model made from nonmagnetic material, was used during the tests of the system. Spectrum analyses of clicking sounds were performed with FFT by using MATLAB. The effectiveness of the designed system have been proved by its' measurement results compared with previous works.

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