Date of Award

1-1-2017

Language

English

Document Type

Master's Thesis

Degree Name

Master of Science (MS)

College/School/Department

Department of Physics

Content Description

1 online resource (ii, v, 82 pages) : illustrations (some color)

Dissertation/Thesis Chair

Carolyn MacDonald

Committee Members

Carolyn MacDonald, Jonathan Petruccelli, Kevin Knuth

Keywords

Biological imaging, differential phase contrast, Fourier imaging, mesh-based imaging, Phase contrast imaging, Security imaging, Diagnostic imaging, Fourier transform optics, Imaging systems in medicine, Radiography, Industrial, Contrast media (Diagnostic imaging)

Subject Categories

Physics

Abstract

Traditional x-ray imaging provides only low contrast from low atomic number materials, like soft tissue, due to the small attenuation variations producing very small intensity changes. Higher contrast can be achieved through phase information. The phase change is obtained from the x-ray refracting in a sample, or phase object, due to the difference in refractive indexes. This causes a small angular deviation from the original path. Phase contrast imaging has not been realized in everyday practice due to the requirement for large spatial coherence width of the x-ray beam which typically requires sources on the order of 10-50 m, the use of a grating technique or synchrotron sources. The grating-based phase imaging method depends upon multiple fine-pitched, expensive gratings and extremely precise alignment.

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