Comparison of fan- and cone-beam imaging capabilities on a portable x-ray imaging system

Timothy A. White; Tim J. Roney; Robert J. Pink; Frederic Noo; Rolf Clackdoyle; Mike Smith; Warren F. Jones

doi:10.1117/12.363715

22 September 1999 Comparison of fan- and cone-beam imaging capabilities on a portable x-ray imaging system

Timothy A. White, Tim J. Roney, Robert J. Pink, Frederic Noo, Rolf Clackdoyle, Mike Smith, Warren F. Jones

Proceedings Volume 3772, Developments in X-Ray Tomography II; (1999) https://doi.org/10.1117/12.363715
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Portable systems for x-ray imaging of objects up to 20-cm in diameter have been developed for field inspection of industrial objects. These systems can be configured with either a linear diode array (45-cm long, 1024-elements, 12- bits/element) or a large-area amorphous-silicon (a-Si) detector (30 X 40-cm², 2304 X 3200-elements, 12- bits/element). Each detector utilizes gadolinium oxysulfide as the scintillation element. X-rays are emitted from an 80 to 300-kVp constant-potential source with a spot size of approximately 1.6-mm. The object can be rotated and the source and detector translated vertically for collection of 'spiral' fanbeam or 'helical' conebeam computed-tomography (CT) data. For low-density objects, the reconstructed spatial resolution of CT data collected with either detector is about the same and the choice of detector is determined by detector parameters such as dynamic range and integration/readout time. For higher-density objects, which need to be imaged at higher energies and for which there is a higher probability of Compton scatter, the linear diode array produces better contrast images of small voids in a scattering medium. A series of experiments designed to test the performance of each detector with and without a scattering medium will be presented.

Citation Download Citation

Timothy A. White, Tim J. Roney, Robert J. Pink, Frederic Noo, Rolf Clackdoyle, Mike Smith, and Warren F. Jones "Comparison of fan- and cone-beam imaging capabilities on a portable x-ray imaging system", Proc. SPIE 3772, Developments in X-Ray Tomography II, (22 September 1999); https://doi.org/10.1117/12.363715

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