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Phase Imaging Using Focusing Polycapillary Optics, Sajid Bashir
Phase Imaging Using Focusing Polycapillary Optics, Sajid Bashir
Legacy Theses & Dissertations (2009 - 2024)
The interaction of X rays in diagnostic energy range with soft tissues can be described by Compton scattering and by the complex refractive index, which together characterize the attenuation properties of the tissue and the phase imparted to X rays passing through it. Many soft tissues exhibit extremely similar attenuation, so that their discrimination using conventional radiography, which generates contrast in an image through differential attenuation, is challenging. However, these tissues will impart phase differences significantly greater than attenuation differences to the X rays passing through them, so that phase-contrast imaging techniques can enable their discrimination.
Phase Imaging Using X-Ray Optics, Bushra Kanwal
Phase Imaging Using X-Ray Optics, Bushra Kanwal
Legacy Theses & Dissertations (2009 - 2024)
Conventional x-ray imaging is a widely used imaging technique in medical diagnostics as well as material analysis. It utilizes only absorption-contrast imaging, which records intensity attenuation due to absorption. A major limitation of this technique for medical imaging is the poor contrast of weakly absorbing details in the soft tissue. Mammography and angiography are two examples where improved contrast is required. In the quest for better contrast in x-ray imaging, a number of different phase contrast imaging techniques have been explored. Phase contrast imaging offers an improvement over traditional absorption contrast because the x-ray wave field traversing an object experiences …