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- W2275976918 abstract "X-ray phase contrast imaging (PCI) has the potential, over certain energy ranges, to improve conventional x-ray diagnostic practice by utilizing the higher phase than absorption coefficient in the complex index of refraction for low atomic Z materials, thereby potentially enhancing the differences between healthy and cancerous tissue. Mammography is a particularly suitable application due to its high biopsy incidence. Of the different types of PCI, the in-line holographic method or propagation-based imaging (PBI) has the ability to utilize polychromatic x-ray sources. In clinical practice, polychromatic x-ray sources require filtering to remove the lower energy rays that have insufficient energy to penetrate the body and provide useful diagnostic information. However, the introduction of filters in PBI is known to cause phase contrast degradation, and this thesis examines both experimentally and theoretically, the various factors affecting phase contrast. Experimental factors using a Feinfocus micro-focus, tungsten x-ray source with 0.5 mm beryllium inherent filtration, included: varying the tube voltage and source size, introducing extra filters of different materials and thicknesses including grain size and surface smoothness, and objects of different shapes and materials and at various positions in the beam. Image detection was via Fuji image plates and BAS5000 scanner. The most convenient filter material was aluminium, and the object showing the best phase contrast was a thin walled, cylindrical fibre (Cuprophan RC55) normally used in dialysis. The x-ray spectrum of the tube was also measured using a" @default.
- W2275976918 created "2016-06-24" @default.
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- W2275976918 date "2011-01-01" @default.
- W2275976918 modified "2023-09-27" @default.
- W2275976918 title "Phase contrast in x-ray imaging" @default.
- W2275976918 hasPublicationYear "2011" @default.
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