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Imaging modalities in x-ray computerized tomography and in selected volume tomography.
1Radiation Physics Department, Faculty of Health Sciences, Linköping University, Sweden.
Physics in Medicine and Biology
|April 22, 1999
Summary
This review explores various x-ray computerized tomography (CT) principles, including attenuation, fluorescence, and diffraction CT. It compares different geometrical setups and secondary photon methods for advanced imaging applications.
Area of Science:
- Medical Imaging
- Physics
- Materials Science
Background:
- X-ray computerized tomography (CT) is a crucial imaging technique.
- Traditional attenuation CT measures linear attenuation coefficients.
- Various interaction processes of X-rays can be exploited for CT.
Purpose of the Study:
- To review and compare different principles of X-ray CT.
- To discuss geometrical configurations and their trade-offs.
- To explore advanced CT modalities beyond standard attenuation CT.
Main Methods:
- Review of existing literature on X-ray CT principles.
- Analysis of geometrical solutions: single-ray, fan-beam, and cone-beam.
- Comparison of attenuation CT with methods based on fluorescence, diffraction, and Compton scattering.
Main Results:
- Attenuation CT quantifies the spatial distribution of the linear attenuation coefficient (mu).
- Alternative CT methods leverage fluorescence, diffraction, and Compton scattering for elemental and structural information.
- Phase-contrast X-ray CT shows promise for enhanced imaging.
Conclusions:
- Diverse X-ray CT principles offer unique insights into material properties.
- Geometrical choices impact CT performance and applicability.
- Emerging CT techniques like phase-contrast imaging expand the capabilities of X-ray tomography.