This paper presents a survey of recent research on sparsity-driven synthetic aperture radar (SAR) imaging. In particular, it reviews (i) analysis and synthesis-based sparse signal representation formulations for SAR image formation together with the associated imaging results; (ii) sparsity-based methods for wide-angle SAR imaging and anisotropy characterization; (iii) sparsity-based methods fo...

of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy ADVANCED TECHNIQUES FOR SYNTHETIC APERTURE RADAR IMAGE RECONSTRUCTION By Duc H. Vu May 2012 Chair: Jian Li Major: Electrical and Computer Engineering This dissertation discusses advanced aspects of Synthetic Aperture Radar (SAR). SAR is ...

OBJECTIVE The purpose of this study was to measure specific absorption rate (SAR) during MRI scanning using a human torso phantom through quantification of diffusion coefficients independently of those reported by the scanner software for five 1.5 and 3 T clinical MRI systems from different vendors. METHODS A quadrature body coil transmitted the RF power and a body array coil received the sig...

SAR simulators are important tools for developing new SAR systems as well as for supporting the analysis of acquired SAR data. Using modern graphics cards for SAR simulation, even complex environments can be simulated in real-time. This is realized by implementing SAR geometry and radiometry within standard graphics hardware, which nowadays offers 3D hardware acceleration and programmable graph...

Hong Kong Med J Vol 14 No 1 Supplement 1 February 2008 37 Health, Safety and Environmental Office, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China JK Kwan, SCT Yu United Christian Hospital, 130 Hip Wo Street, Kwun Tong, Kowloon, Hong Kong SAR, China FL Lau Hospital Authority Head office, 147B Argyle Street, Kowloon, Hong Kong SAR, China TY Wong...

Due to the lack of an appropriate symmetry in the acquisition geometry, generalised bistatic SAR cannot benefit from the two main properties of low-to-moderate resolution monostatic SAR: azimuth-invariance and topography-insensitivity. Precise accommodation of azimuth-variance and topography is a real challenge for efficent algorithms working in the Fourier-domain, but can be quite naturally ha...

Sarsasapogenin (SAR) is a steroidal sapogenin that is used as starting material for the industrial synthesis of steroids. It has various pharmacological benefits, such as antitumor and antidepressant activities. Since its effect on melanin biosynthesis has not been reported, we used murine melanocyte melan-a cells to investigate whether SAR influences melanogenesis. In this study, SAR significa...

A despeckling technique based on multiple image reconstruction and selective 3-dimensional filtering is proposed. Multiple SAR images are reconstructed from a single SAR image by employing compressive sensing (CS) theory. In order to obtain multiple images from single SAR image, multiple subsets of pixels are selected from input SAR image by imposing restriction that each subset has at least 20...

In plants, necrotic lesions occur at the site of pathogen infection through the hypersensitive response, which is followed by induction of systemic acquired resistance (SAR) in distal tissues. Salicylic acid (SA) induces SAR by activating NONEXPRESSER OF PATHOGENESIS-RELATED GENES1 (NPR1) through an oligomer-to-monomer reaction. However, SA biosynthesis is elevated only slightly in distal tissu...

The usability of SAR simulations is often limited by the long processing times of traditional SAR simulators which apply the ray tracing approach. Ray tracing, which is also used for virtual image generation, is based on accurate physical models, but is unfortunately rather computational time intensive. Because of this, real-time applications, like interactive visualisation, in general use the ...