Importance of photon interaction data for medical imaging and images of soft materials using x-ray microtomography

Donepudi V. Rao; S. M. Seltzer; John H. Hubbell

doi:10.1117/12.384524

25 April 2000 Importance of photon interaction data for medical imaging and images of soft materials using x-ray microtomography

Donepudi V. Rao, S. M. Seltzer, John H. Hubbell

Author Affiliations +

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384524
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

Photon interaction cross sections for a few biological materials are calculated at 60 keV using non-relativistic form factors and the incoherent scattering function approximation. Compton, Rayleigh and total scattering cross sections were estimated in the momentum transfer region 0 to 5A^o-1 for simulation and compilation purposes. Rayleigh scattering cross sections for water are estimated using the molecular form factors of Morin at low photon energies. Computed tomographic images of a few soft materials are obtained using a tomographic system based on an image intensifier. It consists of a charged coupled device camera and an acquisition board. The charge coupled device and the acquisition board allows image processing, filtration and restoration. A reconstruction program, written in PASCAL is able to give the reconstruction matrix of the linear attenuation coefficients, and simulates the matrix and the related tomography. X-ray imaging is a well established technique of detecting strongly attenuating materials as distinguished from weakly attenuating materials. The image contrast between the weakly attenuating materials can be enhanced by optimum selection of the X-ray energy and improving the spatial resolution.

Citation Download Citation

Donepudi V. Rao, S. M. Seltzer, and John H. Hubbell "Importance of photon interaction data for medical imaging and images of soft materials using x-ray microtomography", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384524

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