دانلود کتاب امواج الکترومغناطیسی و آنتن‌ها برای کاربردهای زیست پزشکی

Real-time microwave and millimeter-wave (MMW) imaging is the workhorse in applications ranging from a synthetic aperture radar (SAR), which operates with far-field data, to nondestructive testing and medical imaging, which employ nearfield measurements. Research in this field is intensifying with expansion into numerous applications enabled by the advances in high-frequency electronics (from microwaves through millimeter waves to THz). Advances in the flexible programmable platforms, also known as field-programmable gate arrays, provide the critical capability to control and reconfigure very complex high-frequency sensor networks and arrays. This chapter is an attempt to explain, categorize, compare, and contrast real-time MMW reconstruction methods within a common mathematical framework, thus making this interdisciplinary subject more comprehensible and accessible to the wider research community. The discussion is supported by many examples aiding, understanding, and highlighting important performance metrics such as spatial resolution and computational efficiency. The examples are based on two distinctly different real-time quantitative reconstruction methods: quantitative microwave holography (QMH) [1–3] and scattered-power mapping (SPM) [1,4,5]. The impact of approximations that stem from the assumed models of scattering and the practical limitations of the MMW imaging systems are also discussed.