Nele De Geeter

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Accurate simulations on detailed realistic head models are necessary to gain a better understanding of the response to transcranial magnetic stimulation (TMS). Hitherto, head models with simplified geometries and constant isotropic material properties are often used, whereas some biological tissues have anisotropic characteristics which vary naturally with(More)
BACKGROUND Repetitive transcranial magnetic stimulation (rTMS) is used to treat neurological and psychiatric disorders such as depression and addiction amongst others. Neuro-imaging by means of SPECT is a non-invasive manner of evaluating regional cerebral blood flow (rCBF) changes, which are assumed to reflect changes in neural activity. OBJECTIVE rCBF(More)
In transcranial magnetic stimulation (TMS), an applied alternating magnetic field induces an electric field in the brain that can interact with the neural system. It is generally assumed that this induced electric field is the crucial effect exciting a certain region of the brain. More specifically, it is the component of this field parallel to the neuron's(More)
This paper presents a fractal mechanical model for branching systems, with application to the respiratory system. Assuming a dichotomously branching tree, each airway tube is modeled by a Kelvin-Voigt model (a spring in parallel with a dashpot) using morphological values. The model allows investigations on the viscoelastic properties within the context of(More)
Accurate estimation of the human head conductivity is important for the diagnosis and therapy of brain diseases. Induced Current - Magnetic Resonance Electrical Impedance Tomography (IC-MREIT) is a recently developed non-invasive technique for conductivity estimation. This paper presents a formulation where a low number of material parameters need to be(More)
This paper presents a fractal mechanical model for branching systems, with application to the respiratory system. Assuming a dichotomously branching tree, each airway tube is modeled by a Kelvin-Voigt model (a spring in parallel with a dashpot) using morphological values. The model allows investigations on the viscoelastic properties within the context of(More)
A widely applied method for simulating the induced eddy currents in biological tissues is the impedance method (IM). This method has recently been extended to the independent impedance method (IIM), which identifies and solves a linear system of independent equations, resulting in acceleration of computations. Both IM and IIM assume isotropic material(More)
An accurate conductivity estimation of human brain tissues is important for the correct diagnosis and therapy of neurological diseases. These values are patient-specific and vary naturally with the frequency. Nevertheless, they are often approximated by a constant value. Induced current magnetic resonance-electrical impedance tomography (ICMR-EIT) is a(More)
Transcranial magnetic stimulation (TMS) of the dorsolateral prefrontal cortex (DLPFC) is increasingly used as a non-invasive treatment for medication-resistant depression. However, this target site is commonly localized using an inaccurate standard procedure, which uses a fixed distance with respect to the motor cortical site for optimal stimulation of a(More)