In-line phase contrast for weakly absorbing materials with a microfocus x-ray source

• 来源期刊: 中国物理（英文版）
• 关键词: in-line phase contrast intensity distribution microfocus Presnel diffraction
• 年，卷（期）: 2006,（8）
• 页码范围: 1731-1737
• 页数: 7页
• 语种: 英文

摘要

For weakly absorbing materials, image contrast can be enhanced by phase contrast in formation. The effectiveness of the in-line phase contrast technique relies on its ability to record intensity data which contain information on the x-ray's phase shift. Four kinds of approaches to the relationship between intensity distribution and phase shift are reviewed and discussed. A micro-focal x-ray source with high geometrical magnification is used to acquire phase contrast images. A great improvement on image quality is shown and geometrical parameters are modified for comparison between different imaging positions.