introduction: variable resolution x-ray (vrx) ct is a new type of ct that can image objects at various spatial resolutions. in a vrx ct scanner, the spatial resolution increases at the cost of reduction in the field of view (fov). an important factor that limits the spatial resolution of the vrx ct is the effect of focal spot size. also, the optimum magnification is different at each incident a...

background: a variable resolution x-ray (vrx) ct scanner provides a great increase in the spatial resolution. in vrx ct scanners, the spatial resolution of the system and its field of view (fov) can be changed according to the object size. one of the main factors that limit the spatial resolution of vrx ct scanner is the effect of the x-ray focal spot. materials and methods: a theoretical study...

Background: A variable resolution X-ray (VRX) CT scanner provides a great increase in the spatial resolution. In VRX CT scanners, the spatial resolution of the system and its field of view (FOV) can be changed according to the object size. One of the main factors that limit the spatial resolution of VRX CT scanner is the effect of the X-ray focal spot. Materials and Methods: A theoreti...

Introduction: Variable resolution x-ray (VRX) CT is a new type of CT that can image objects at various spatial resolutions. In a VRX CT scanner, the spatial resolution increases at the cost of reduction in the field of view (FOV). An important factor that limits the spatial resolution of the VRX CT is the effect of focal spot size. Also, the optimum magnification is different at each incident a...

We use the notion of boundary points to study resolution proofs. Given a CNF formula F , an l(x)-boundary point is a complete assignment falsifying only clauses of F having the same literal l(x) of variable x. An l(x)-boundary point p mandates a resolution on variable x. Adding the resolvent of this resolution to F eliminates p as an l(x)-boundary point. Any resolution proof has to eventually e...

On the basis of resolution function K(x0; x) for some kinematical variable x we propose the method to estimate x̂ and + x ; x from observed x for a single event. We also propose the method to estimate parameters of resolution function from the set of test or Monte Carlo data fxtr i ; x i g. The last point to discuss is the correct choice of binning in x for smearing matrix used in the model of m...

The soft-X ray range, between 1-10 nm wavelength, is highly interesting for X-ray microscopy. Taking advantage of it requires, however, to operate a high resolution instrument at a variable wavelength. We describe here an image converter X-ray microscope which is based on secondary pharoemission. This instrument is now developped at the Institut dlOptique (Orsay); it will be installed near ACO ...

The contribution of this paper is to introduce heuristics, that go beyond safe state abstraction in hierarchical reinforcement learning, to approximate a decomposed value function. Additional improvements in time and space complexity for learning and execution may outweigh achieving less than hierarchically optimal performance and deliver anytime decision making during execution. Heuristics are...