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Full-Text Articles in Physical Sciences and Mathematics
Therapy And Medical Imaging Applications Of Focusing Polycapillary X-Ray Optics, Weiyuan Sun
Therapy And Medical Imaging Applications Of Focusing Polycapillary X-Ray Optics, Weiyuan Sun
Legacy Theses & Dissertations (2009 - 2024)
Focusing polycapillary optics yield high gains in intensity and increased spatial resolution for a variety of clinical, lab-based, synchrotron, or in situ analysis applications. In this dissertation we investigate the extension of two applications of focusing polycapillary optics. The first is the application of polycapillary optics in radiation therapy. This discussion includes measurements and calculation of dose for focused beam orthovoltage therapy. A system has been designed to investigate whether the polycapillary optics can produce an X-ray beam which can give more accurate dose painting due to the higher dose concentration at the focal spot. X-ray exposures were measured with …
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 …
Simulation Of Polycapillary And Multichannel Plate X-Ray Optics, Robert Schmitz
Simulation Of Polycapillary And Multichannel Plate X-Ray Optics, Robert Schmitz
Legacy Theses & Dissertations (2009 - 2024)
Simulation of x-ray optical systems is an important tool for optics design for known applications, and optic development for potential applications. Polycapillary optics are thin glass cylinders containing hundreds of thousands of hollow channels that transmit x rays using total external reflection. These optics have been developed for many applications, from beam filtering to x-ray collimating or focusing. A Monte Carlo based ray-tracing simulation was developed to model a wide range of polycapillary optic geometries. The simulation uses a vector-based approach to model all photons and optical geometries in three dimensions. Simulation verification was performed for a wide range of …
Doubly Curved Crystal Optics For Monochromatic And Diffraction Enhanced X-Ray Imaging, Santosh Kumar Sahoo
Doubly Curved Crystal Optics For Monochromatic And Diffraction Enhanced X-Ray Imaging, Santosh Kumar Sahoo
Legacy Theses & Dissertations (2009 - 2024)
In radiographic imaging the contrast can be enhanced with the use of monochromatic radiation compared to conventional broadband source. Monochromatic beam radiation can be produced with conventional sources by diffraction off of flat monochromator crystals, but this produces a low monochromatic intensity for imaging.