Abstract
Previous research showed that pulsed functional magnetic stimulation can activate brain tissue with optimum intensity and frequency. Conventional stimulation coils are always set as a figure-8 type or Helmholtz. However, the magnetic fields generated by these coils are uniform around the target, and their magnetic stimulation performance still needs improvement. In this paper, a novel type of stimulation coil is proposed to shrink the irritative zone and strengthen the stimulation intensity. Furthermore, the electromagnetic field distribution is calculated and measured. Based on numerical simulations, the proposed coil is compared to traditional coil types. Moreover, the influential factors, such as the diameter and the intersection angle, are also analyzed. It was demonstrated that the proposed coil has a better performance in comparison with the figure-8 coil. Thus, this work suggests a new way to design stimulation coils for transcranial magnetic stimulation.
Highlights
Transcranial magnetic stimulation (TMS) devices have been widely used in clinics and for medical research
Using repeated stimulations, ailments, such as epilepsy and depression, can be alleviated [3,4]. Despite such advances, the intensity and the stimulated areas are still limited by the signal generator system and the stimulation coil design
Transcranial magnetic stimulation is a non-invasive diagnostic and therapeutic technique that is based on the current induced by an applied magnetic field
Summary
Using repeated stimulations, ailments, such as epilepsy and depression, can be alleviated [3,4] Despite such advances, the intensity and the stimulated areas are still limited by the signal generator system and the stimulation coil design. Despite the great progress of the use of magnetic fields in nerve stimulation, the study on stimulation coil is mainly a study of qualitative theory analysis and lacks in a systems optimization method that is exercisable. To improve the performance of magnetic stimulation, it is necessary to pay attention to both field strength and the focality.
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