Abstract
Hemorrhage imaging is one of the most common applications of magnetic induction tomography (MIT). Depth and the mass of stroke stimulated (MSS) are the most important issues that need to be solved for this application. Transcranial magnetic stimulation (TMS) is a technique belonging to the deep brain stimulation (DBS) field, which aims at overcoming human diseases such as depression. TMS coils, namely, circular, figure-8, and H-coils, play an important role in TMS. Among these, H-coils individually focus on the issues of achieving effective stimulation of deep region. MIT and TMS mechanisms are similar. Herein, for the first time, improved TMS coils, including figure-8 and H-coils, are applied as MIT excitation coils to study the possibility of achieving the mass of stroke stimulated and deep detection through MIT. In addition, the configurations of the detection coils are varied to analyze their influence and determine the optimal coils array. Finally, MIT is used to detect haemorrhagic stroke occurring in humans, and the application of deep MIT to the haemorrhagic stroke problem is computationally explored. Results show that among the various coils, the improved H-coils have MSS and depth characteristics that enable the detection of deep strokes through MIT. Although the detecting depth of the figure-8 coil is weaker, its surface signal is good. The deep MIT technique can be applied to haemorrhagic detection, providing a critical base for deeper research.
Highlights
Magnetic induction tomography (MIT) is a technique that uses excitation coils to produce an eddy current field in tissues and uses detection coils to detect tissues and image the internal conductivity of the tissue
From the top of the head to the center, we observed the electric field strength generated at the target object
Revealed that from the top of the head, the electric field generated by the circular planar coil (S coil) is the largest in the given detection area, up to ∼306 V/m, whereas the figure-8 coil’s electric field is of only 162 V/m and that of the H-coil is only 58 V/m
Summary
Magnetic induction tomography (MIT) is a technique that uses excitation coils to produce an eddy current field in tissues and uses detection coils to detect tissues and image the internal conductivity of the tissue. MIT is suitable to detect brain strokes. Hemorrhage and ischemic strokes can be fatal or can cause severe non-recoverable damage. Researchers have been simulating MIT application to assess strokes in the human brain, including both two-dimensional (2D) and three-dimensional (3D) models, using various models ranging from a simple sphere model to a real head model. MIT is advantageous in terms of studying the human brain because existing research is available on it
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