Hard x-ray phase tomography with low-brilliance sources

Area of Science:

• Medical Imaging
• Biophysics
• Materials Science

Background:

• Traditional X-ray imaging offers limited contrast for certain materials.
• Phase contrast imaging enhances visibility of weakly absorbing materials.
• Existing phase contrast methods often require high-brilliance synchrotron X-ray sources.

Purpose of the Study:

• To develop and demonstrate a tomographic phase contrast imaging method suitable for laboratory X-ray sources.
• To enable quantitative 3D imaging of centimeter-sized objects.
• To explore applications in medicine, biology, and non-destructive testing.

Main Methods:

• Utilized a hard X-ray grating interferometer to acquire differential phase contrast projection images.
• Employed filtered back projection algorithms for tomographic reconstruction.
• Applied the method to centimeter-sized objects using a lab-based X-ray source.

Main Results:

• Successfully performed tomographic phase contrast imaging with a low-brilliance X-ray source.
• Obtained quantitative volumetric information of the refractive index (both real and imaginary parts).
• Demonstrated the feasibility of imaging larger, centimeter-sized samples.

Conclusions:

• The developed method provides a versatile approach for 3D phase contrast imaging.
• This technique expands the accessibility of phase contrast imaging beyond large-scale facilities.
• The quantitative volumetric data is valuable for various scientific and industrial fields.