The need to assess security and take protection decisions is at least as old as our civilisation. However, the complexity and development speed of our interconnected technical systems have surpassed our capacity to imagine and evaluate risk scenarios. This holds in particular for risks that are caused by the strategic behaviour of adversaries. Therefore, technology-supported methods are needed ...

Background Cardiac and respiratory motion artifacts are major challenges to whole-heart coronary MRA. The conventional motion suppression strategies often involve prospective gating based on motion surrogates, e.g. ECG and navigator, which complicates scan setup and prolongs scan time significantly. To address these limitations, an ECG and navigator-free 4D whole-heart coronary MRA technique wa...

In this video paper, we introduce two context-aware applications: a navigator, and a communicator which are implemented in our laboratory premises. The applications are developed on a software platform which supports the integration of several different kinds of sensors. Currently we use data from three location sensing methods and user activity data as sensor input. The navigator is used for g...

Introduction: There is a long history of motion compensation in MRI using navigator echoes, now a mature technique [1]. MR navigators work well, but their applications have been limited by several factors: the need to slow down imaging in order to make time for the navigator, interference with the steady state of the base sequence, and substantial engineering needed to implement and validate ne...

AbstractThis paper presents an intelligent navigation method for navigation of a mobile vehicle in unknown environments. The proposed navigator consists of three modules: Obstacle Avoidor, Environment Evaluator and Navigation Supervisor. The Obstacle Avoidor is a fuzzy controller whose rule base is learnt through reinforcement learning. A new and powerful training method is proposed to constru...

Background Respiratory motion of the heart poses a problem for high resolution cardiac MR imaging. Prospective slice following uses the navigator position immediately prior to the imaging segment to correct the slice positions throughout the segment [1]. The navigator is typically placed over the right hemi-diaphragm and a fixed correction factor is used to adjust for the difference to the moti...

INTRODUCTION Free-breathing coronary MRA (CMRA) typically uses a diaphragm navigator (NAV) for respiratory motion suppression, which is an indirect measure of the respiration-induced cardiac motion (1, 2). Slice tracking (3, 4) can be used to widen the acceptance window to improve navigator efficiency, but relies on a linear motion model to derive heart displacement. A linear correction factor ...

SUMMARY We report on the development of the high-throughput screening (HTS) Navigator software to analyze and visualize the results of HTS of chemical libraries. The HTS Navigator processes output files from different plate readers' formats, computes the overall HTS matrix, automatically detects hits and has different types of baseline navigation and correction features. The software incorporat...

Introduction Navigator echo is an effective technique to suppress respiratory and cardiac motion in MR angiography. Ahn and Cho's (AC) algorithm extracts the displacement from the navigator phase. Although computationally efficient, it is susceptible to noise, particularly contributions from points at the edges of k-space. We proposed a kspace weighted least-squares (KWLS) algorithm that is as ...