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In this paper, a synthetic aperture based ultra wideband imaging system with semi-adaptive signal processing is proposed for hemorrhagic stroke detection in a simulated head model. The 3D spherical model consists of four dispersive layers representing different parts of the head. In a bistatic configuration, two ultra wideband Vivaldi antennas sweep a semi-spherical synthetic array conformal to the...
A Synthetic Aperture-based UWB imaging system is proposed for medical imaging applications. According to the desired resolution requirements, SAR array parameters as well as the frequency range of the system are derived. Discussion is made upon maintaining the balance between performance and complexity of the ultimate design. As image reconstruction algorithm, a hybrid semi-adaptive method consisting...
In this paper an optimized UWB antenna structure is presented, which is suitable for radiation in the human body. The antenna has been characterized both in the frequency domain and in the time domain, investigating also the impact of the human body frequency-dependent characteristics on the signal transmitted by the antenna into the body. Parameters have been introduced to characterize the antenna...
In this paper a synthetic aperture (SA)-based ultra wideband (UWB) imaging system with broadband adaptive processing is proposed for general medical applications (e.g. breast cancer, water accumulation in bladder, etc.). For the signal processing, a broadband version of minimum variance distortionless response (MVDR) is implemented. To demonstrate the efficiency of the method, it is applied to an...
In this paper, an ultra wideband imaging system with semi-adaptive signal processing is examined for hemorrhagic stroke detection in a simulated head model. The 3D model consists of four non-dispersive layers representing different parts of the head. Through achieved simulation results, it is shown that ultra wideband radar concept has the potential of being an alternative imaging technique for stroke...
The feasibility of medical diagnostic through Ultra Wideband technology is investigated, both from a system point of view and a component design perspective. The characteristics and the properties of the in-body UWB electromagnetic wave propagation are assessed and from them requirements on the system design are derived. Moreover, a system concept for medical diagnostic purposes based on the UWB Radar...
Ultra wideband synthetic aperture-based radar imaging via adaptive signal processing is proposed for hemorrhagic stroke detection. The efficiency of the method is evaluated via simulation results corresponding to a 3D head model consisting of four dispersive layers. A semi-spherical synthetic array is formed around the model by moving two ultra wideband Vivaldi antennas. A broadband version of minimum...
Different strategies have been suggested to improve the stop band of microwave lowpass filters and to suppress the spurious responses in the stop band. Resonance structures can be utilized in various microwave applications to improve the performance. In this article, a special form of a resonance structure is introduced which assists in achieving a deep stop band for microwave LP filters. Simulations...
There are numerous radar cross section (RCS) estimation techniques each of which suggests its advantages and disadvantages. Geometrical theory of diffraction (GTD) is a powerful high frequency method that explains scattering from electrically large bodies. In this paper, geometrical theory of diffraction and equivalent currents (EC) methods are used to analyze the echo area of an aircraft model in...
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