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Surgical therapy has become an important therapeutic alternative for patients with medically intractable epilepsy. Correct and anatomically precise localization of the epileptic focus, preferably with non-invasive methods, is the main goal of the pre-surgical epilepsy diagnosis to decide if resection of brain tissue is possible. For evaluating the… (More)
Mutual coupling is well known as an undesirable effect as it degrades the performance of most array signal processing algorithm. Such undesirable effect becomes significant when the antenna element spacing becomes small, which is the case for compact antenna array. Throughout the years, extensive studies from signal processing and communication society have… (More)
This paper presents an overview of several ultrawideband (UWB) antenna systems recently developed at Chalmers for applications in future UWB radio telescopes and industry sensor imaging process.
Microwave imaging for breast cancer detection has been of significant interest for the last two decades. Recent studies focus on solving the imaging problem using an inverse scattering approach. Efforts have mainly been focused on the development of the inverse scattering algorithms, experimental setup, antenna design and clinical trials. However, the… (More)
An efficient algorithm for non-rigid image registration is proposed. The proposed method consists of two-stage registration process, which is based on affine transformation in both local and global registration. Numerical examples demonstrated that the proposed method provides more accurate registration results than global registration methods.
In this paper the use of different polarization data in microwave image reconstruction is investigated. The present study is based on numerical simulation data of a generic breast phantom, and a time domain FDTD based reconstruction method. In general, reconstruction results are be both application and algorithm dependent. The results show very different… (More)
Radar target identification based on resonant frequencies requires analysis of the “late-time” portion of the target signature: the period when early-time scattering has ceased, the resonant frequencies are well established, and the signal can still be distinguished from the noise. While target geometry can be used to determine the late-time… (More)