Scanning hard x-ray differential phase contrast imaging with a double wedge absorber
Taihei Mukaide1, Kazuhiro Takada, Masatoshi Watanabe
1Materials Technology Development Center, Canon Inc., 30-2, Shimomaruko 3-chome, Ohta-ku, Tokyo 146-8501, Japan.
The Review of Scientific Instruments
|April 2, 2009
Summary
This study introduces a novel x-ray imaging technique using a double wedge absorber for sensitive, two-directional differential phase contrast. This method generates artifact-free quantitative phase maps, improving imaging of partial object boundaries.
Area of Science:
- Physics
- Materials Science
- Medical Imaging
Background:
- Differential phase contrast (DPC) imaging enhances contrast in X-ray microscopy.
- Traditional DPC methods often struggle with artifacts and limited field of view.
- Simultaneous two-directional measurements are crucial for accurate phase retrieval.
Purpose of the Study:
- To develop a novel X-ray imaging technique for quantitative phase mapping.
- To achieve high-sensitivity, two-directional differential phase contrast imaging.
- To overcome limitations of existing DPC methods, particularly regarding artifacts and partial object visibility.
Main Methods:
- Utilized an X-ray microbeam and a specifically designed double wedge absorber.
- The double wedge absorber converts X-ray beam refraction into measurable intensity changes.
- Employed Fourier integration of two-directional phase gradients for quantitative phase map reconstruction.
Main Results:
- Achieved simultaneous detection of two-directional refraction angles with microrad sensitivity.
- Generated quantitative phase maps free from artifacts, even with partial object boundaries in view.
- Demonstrated flexibility in controlling phase gradient sensitivity by modifying the wedge absorber.
Conclusions:
- The developed double wedge absorber technique offers a robust method for quantitative phase imaging.
- This approach significantly reduces artifacts and improves imaging of incomplete structures.
- The technique's adaptable sensitivity makes it versatile for various X-ray imaging applications.
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