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Communication Dans Un Congrès Année : 2015

Computed Radiography System Simulation Focusing on the Optical Readout Process

Résumé

Computed radiography (CR) is a digital radiographic technique based on the use of a phosphor imaging plate (IP). In CR, X-ray flux is received by IP forming a latent image which is later read and digitized by an optical system with a scanning laser. CR is an effective replacement of the traditional film-based radiography in medical applications for its high dynamic range and high efficiency at low energies. For industrial applications, it cannot meet all inspection requirements because of its poor performance at high energies. In terms of spectral resolution, the IP is strongly energy dependent and much more sensitive to energies up to about 100keV. In terms of spatial resolution, the Point Spread Function of the IP is also degraded at high energies. Moreover the optical readout process further degrades the final image quality. To be fully used in industrial radiography, CR performance needs to be optimized. Guidelines have been addressed in international standards to ensure a good image quality supplied by CR system, where source type and metallic intensifying screens are defined for different cases. Adjusting the scanning parameters might also be a way to improve the final image quality. Computer simulation can help to investigate underlying problems and improve the system performance. A lot of prior studies focused on the CR exposure, while this study focuses more on the simulation of the CR readout process including the laser scattering within the IP and the laser scanning effect. The talk will first present briefly the CR simulation approach we developed, and then detail the optical readout simulation. A Monte Carlo method is adopted for simulating light transport in the IP. The influence of several parameters such as physical properties of IP material and IP thickness are studied. During the laser scanning process, the latent image is modified as the CR readout is a destructive process. The laser scanning process is simulated by an analytical model taking into account the scanning parameters like laser power or speed displacement. The influence of those parameters on final image quality will be presented.
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Dates et versions

hal-01282273 , version 1 (03-03-2016)

Identifiants

  • HAL Id : hal-01282273 , version 1

Citer

Min Yao, Valerie Kaftandjian, Philippe Duvauchelle, Angéla Peterzol-Parmentier, Andreas Schumm, et al.. Computed Radiography System Simulation Focusing on the Optical Readout Process. Digital Industrial Radiology and Computed Tomography, Ghent University, Jun 2015, Ghent, Belgium. ⟨hal-01282273⟩
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