نتایج جستجو برای: radiographic contrast

تعداد نتایج: 419377  

Journal: :Optics letters 2015
Tunhe Zhou Irene Zanette Marie-Christine Zdora Ulf Lundström Daniel H Larsson Hans M Hertz Franz Pfeiffer Anna Burvall

The speckle-based scanning method for x-ray phase-contrast imaging is implemented with a liquid-metal-jet source. Using the two-dimensional scanning technique, the phase shift introduced by the object is retrieved in both transverse orientations, and the limitations on spatial resolution inherent to the speckle-tracking technique are avoided. This method opens up possibilities of new high-resol...

Journal: :Journal of synchrotron radiation 2015
A K Agrawal B Singh Y S Kashyap M Shukla P S Sarkar Amar Sinha

A full-field hard X-ray imaging beamline (BL-4) was designed, developed, installed and commissioned recently at the Indus-2 synchrotron radiation source at RRCAT, Indore, India. The bending-magnet beamline is operated in monochromatic and white beam mode. A variety of imaging techniques are implemented such as high-resolution radiography, propagation- and analyzer-based phase contrast imaging, ...

2007
Alessandro Olivo

Phase contrast imaging PCI solves the basic limitation of x-ray imaging, i.e., poor image contrast resulting from small absorption differences. Up to now, it has been mostly limited to synchrotron radiation facilities, due to the stringent requirements on the x-ray source and detectors, and only one technique was shown to provide PCI images with conventional sources but with limits in practical...

Journal: :Optics express 2015
Masih Nilchian Zhentian Wang Thomas Thuering Michael Unser Marco Stampanoni

Differential phase contrast imaging using grating interferometer is a promising alternative to conventional X-ray radiographic methods. It provides the absorption, differential phase and scattering information of the underlying sample simultaneously. Phase retrieval from the differential phase signal is an essential problem for quantitative analysis in medical imaging. In this paper, we formali...

ژورنال: تحقیقات دامپزشکی 2007
ابوتراب طباطبائی نائینی سعید نظیفی, ژاله مهاجری برازجانی

The aim of the present studyis radiographic evaluation of urinary system and the effect of urografin on clinical parameters, urinalysis and renal function tests in sheep. Six clinically healthy female sheep were selected for this study. Before experiment, vital signs were recorded. Blood and urine samples were collected prior to the trials and paraclinical examinations were performed. Uri...

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