BACKGROUND AND PURPOSE To safeguard patient health, there is great interest in CT radiation-dose reduction. The purpose of this study was to evaluate the impact of an iterative-reconstruction algorithm, ASIR, on image-quality measures in reduced-dose head CT scans for adult patients. MATERIALS AND METHODS Using a 64-section scanner, we analyzed 100 reduced-dose adult head CT scans at 6 predef...

In this paper, we introduce a two-step iterative algorithm to prove a strong convergence result for approximating common fixed points of three contractive-like operators. Our algorithm basically generalizes an existing algorithm..Our iterative algorithm also contains two famous iterative algorithms: Mann iterative algorithm and Ishikawa iterative algorithm. Thus our result generalizes the corre...

It is known that synthetic aperture radar (SAR) images obtained by typical matched filtering (MF)-based algorithms always suffer from serious noise, sidelobes and clutter. However, the improvement in image quality means complexity of SAR systems will increase, which affects applications images. The introduction sparse signal processing technologies into imaging proposes a new way to solve this ...

Ground moving targets (GMT), due to the existence of velocity in range and azimuth direction, will lead deviation from their true position defocus direction during synthetic aperture radar (SAR) imaging process. To address this problem compress amount echo data, a sparse SAR method for ground is proposed. Specifically, we first constructed two-dimensional observation model GMT based on matched ...

In this paper, an acquisition algorithm is discussed in parallel combinatory spread spectrum (PCSS) system. The algorithm model is first built. Then, an improved algorithm utilizing multiple correlation peak accumulation under low SNR is proposed. The simulation results show that Doppler offset and PN code-phase delay can be obtained by using the proposed acquisition algorithms. The simulation ...

This paper proposes an algorithm that distributes bits according to different noise margin levels, thereby realizing unequal error protection (UEP). The new approach is based on a non-UEP allocation algorithm by Chow, Cioffi, and Bingham. The new algorithm is designed to be robust to non-stationary impulse noise and channel variations by integrating a new SNR-sorting scheme. Simulation results ...