System characterization of the STATSCAN full body slit scanning radiography machine: theory and experiment

Martin Scheelke; J. Herman Potgieter; Mattieu de Villiers

doi:10.1117/12.595785

20 April 2005 System characterization of the STATSCAN full body slit scanning radiography machine: theory and experiment

Martin Scheelke, J. Herman Potgieter, Mattieu de Villiers

Author Affiliations +

Proceedings Volume 5745, Medical Imaging 2005: Physics of Medical Imaging; (2005) https://doi.org/10.1117/12.595785
Event: Medical Imaging, 2005, San Diego, California, United States

Abstract

This report presents a system model of the STATSCAN slit scanning full body radiography machine. A Cascaded Linear Systems model of the detector was developed and the theoretical DQE, MTF and NPS were compared to measured values for the RQA9 beam quality described in IEC 62220-1. The effect on detector DQE of various system parameters such as coupling efficiency, CCD noise and pixel binning was quantified. System performance for various thicknesses of Gd₂O₂S:Tb was analyzed. The notion of a “System DQE” has been suggested by several authors to facilitate the comparison of overall systems. An expression for the overall “System DQE” was developed by including the effects of scattered radiation, grid attenuation and focal spot unsharpness in the cascaded model. Scattered radiation was quantified as a function of system geometry parameters and was treated as an “additive noise stage”. A realistic model of the focal spot was used to calculate the MTF due to beam divergence in the scan direction and focal spot unsharpness in the slit direction. It was found that the “System DQE” is a valuable parameter for the purpose of comparing gridless slit scanning system performance to conventional geometry system performance.

Citation Download Citation

Martin Scheelke, J. Herman Potgieter, and Mattieu de Villiers "System characterization of the STATSCAN full body slit scanning radiography machine: theory and experiment", Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); https://doi.org/10.1117/12.595785

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