Aims. The positions and source sizes of X-ray sources taking into account Compton backscattering (albedo) are investigated. Methods. Using a Monte Carlo simulation of X-ray photon transport including photo-electric absorption and Compton scattering, we calculate the apparent source sizes and positions of X-ray sources at the solar disk for various source sizes, spectral indices and directivitie...

3 Simulation of Extended Sources 10 3.1 Global Illumination . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1.1 Ray Tracing, Radiosity, and Alternative Solutions . . 11 3.2 Methodology for Ray Tracing Extended Area Sources . . . . 13 3.2.1 Pre-Render Calculations . . . . . . . . . . . . . . . . . 13 3.2.2 Pre-Render Calculation of Source Area . . . . . . . . . 13 3.2.3 Rendering . . . . . ...

Current computed tomography (CT) scanners, including micro-CT scanners, utilize a point x-ray source. As we target higher and higher spatial resolutions, the reduced x-ray focal spot size limits the temporal and contrast resolutions achievable. To overcome this limitation, in this paper we propose to use a line-shaped x-ray source so that many more photons can be generated, given a data acquisi...

Of the 21 new sources that INTEGRAL discovered up to Feb. 1, 2004, 5 were detected with the BeppoSAX Wide Field Cameras at earlier times. IGR J16320-4751 appears to be a persistently active X-ray source which hints at a supergiant Roche-lobe overflowing companion star in this proposed highmass X-ray binary. IGR J17091-3624 is a transient source that was detected in 1996 and 2001 with a maximum ...