Computed tomography with monochromatic bremsstrahlung radiation

Area of Science:

• Medical Physics
• Materials Science
• Radiological Imaging

Background:

• X-ray beam quasi-monochromatization is crucial for advanced imaging techniques.
• Developing effective filters is key to improving X-ray beam quality.
• Differential tomography requires precisely controlled X-ray energy spectra.

Purpose of the Study:

• To investigate the production of quasi-monochromatic X-ray beams using filters made of Mo, Sb, Cs, Ce, and Gd in a boric acid matrix.
• To analyze the impact of filter thickness (50-300 microm) on X-ray beam resolution (FWHM) and intensity reduction.
• To evaluate the application of these filtered beams in differential tomography for elemental identification.

Main Methods:

• Fabrication of filters using a boric acid matrix with elements Mo, Sb, Cs, Ce, and Gd.
• Systematic variation of filter thickness from 50 to 300 microm.
• Operation of a high voltage X-ray tube from 30 to 70 kVp.
• Measurement of beam resolution (Full Width at Half Maximum - FWHM) and beam intensity reduction.
• Comparison of conventional and differential tomography images.

Main Results:

• Filter thickness significantly affects X-ray beam resolution and intensity.
• Optimal filter thicknesses were determined for different elements and X-ray tube voltages.
• Differential tomography using these filtered beams successfully identified elements like Zr, Nd, Ba, and Sm.
• The method demonstrated potential for enhancing elemental contrast in tomographic imaging.

Conclusions:

• The developed filter method effectively produces quasi-monochromatic X-ray beams.
• This technique improves differential tomography for elemental analysis in medical and materials imaging.
• The study provides a foundation for optimizing X-ray imaging systems for specific elemental detection.