نتایج جستجو برای: ray imaging
تعداد نتایج: 712871 فیلتر نتایج به سال:
We demonstrate two algorithms used forreconstructing the target's structure basedon the diffracted pulses and additionallyshow that a three-dimensional target can bereconstructed using the broadband pulsesand a Fresnel lens by virtue of itsfrequency dependent focal length. Oneadvantage of T-ray imaging is the abilityto measure the far-infrared spectralresponse of the target. To highlight theimp...
Virtually all X-rays imaging in a medical or biological context is performed by measuring differences in the attenuation of X-rays by the tissues. The material properties are inferred from the differences in the number of photons detected at the end of defined paths in the sample. Naturally then this form of X-ray imaging concentrates almost entirely on the particle side of X-ray behaviour. The...
X-ray imaging instruments will operate in a harsh ionizing radiation background environment on implosion experiments at the National Ignition Facility. These backgrounds consist of mostly neutrons and gamma rays produced by inelastic scattering of neutrons. Imaging systems based on x-ray framing cameras with film and CCD’s have been designed to operate in such harsh neutron-induced background e...
X-ray imaging is of paramount importance for clinical and preclinical imaging but it is fundamentally restricted by the attenuation-based contrast mechanism, which has remained essentially the same since Roentgen's discovery a century ago. Recently, based on the Talbot effect, groundbreaking work was reported using 1D gratings for X-ray phase-contrast imaging with a hospital-grade X-ray tube in...
We have begun to study a mission to carry out the first high sensitivity imaging survey of the entire sky at hard x-ray energies (5-600 keV). The Energetic X-ray Imaging Survey Telescope (EXIST) would include 2-4 large area coded aperture telescopes with offset fields of view allowing total exposures of .;:.., 500 ksec and flux sensitivities below 1 mCrab over the full sky in a year with time r...
We describe a small-angle x-ray scattering-based imaging technique that reveals the distribution and orientation of nano-scale structures over extended areas. By combining two measurement and analysis schemes, complementary structural information is available which renders the technique suitable for a broad range of applications, e.g. in materials science and bioimaging. Through a combination o...
Alberto Bravin received his PhD in Physics at the University of Trieste (Italy) on the development of X-ray phase contrast imaging. In 1999, he joined the European Synchrotron Radiation Facility (ESRF) in Grenoble (France) and since 2003 he has been in charge of the Bio-medical beamline ID17. At the ESRF, he is leading the preclinical phase contrast imaging programs applied to mammography and c...
A new kind of enhanced contrast X-ray imaging of weakly absorbing materials in dark field mode is presented. Samples such as plastics and biological tissue are a perpetual challenge for radiographic imaging. Recent innovative approaches such as Diffraction Enhanced Imaging (DEI), “phase contrast”, grating interferometry (Talbot-Lau), or Refraction Enhanced Imaging (REI) have in common that they...
Diffraction enhanced imaging is a new x-ray radiographic imaging modality using monochromatic x-rays from a synchrotron which produces images of thick absorbing objects that are almost completely free of scatter. They show dramatically improved contrast over standard imaging applied to the same phantom. The contrast is based not only on attenuation but also the refraction and diffraction proper...
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