Performance evaluation of a direct computed radiography system by means of physical characterization and contrast detail analysis

Stefano Rivetti; Nico Lanconelli; Marco Bertolini; Giovanni Borasi; Domenico Acchiappati; Aldo Burani M.D.

doi:10.1117/12.710523

19 March 2007 Performance evaluation of a direct computed radiography system by means of physical characterization and contrast detail analysis

Stefano Rivetti, Nico Lanconelli, Marco Bertolini, Giovanni Borasi, Domenico Acchiappati, Aldo Burani M.D.

Author Affiliations +

Proceedings Volume 6510, Medical Imaging 2007: Physics of Medical Imaging; 65104M (2007) https://doi.org/10.1117/12.710523
Event: Medical Imaging, 2007, San Diego, CA, United States

Abstract

The aim of this study is to determine the performance of a direct CR reader, named "FCR Velocity U Focused Phosphor (FP)". The system is based on a CsBr columnar structured crystal, and the system's read out is based on the "linescan technology" that employs a wide-view CCD. The system's physical performance was tested by means of a quantitative analysis, with calculation of the modulation transfer function (MTF), noise power spectrum (NPS) and detective quantum efficiency (DQE). Image quality was assessed by performing a contrast-detail analysis. The results are compared with those obtained with the well known CR system Fuji FCR XG5000, and the new one Kodak DirectView CR 975. For all the measurements the standard radiation quality RQA-5 was used. The relationship between signal amplitude and entrance air kerma is logarithmic for all the systems and the response functions were used to linearize the images before the MTF (edge method) and NPS calculations. The contrast detail analysis has been achieved by using the well known CDRAD phantom and a customized software designed for automatic computation of the contrast-detail curves. The three systems present similar MTFs, whereas the Fuji Velocity U FP system, thanks to its greater efficiency, has a better behavior in terms of NNPS, especially at low frequencies. That allows the system based on columnar phosphor to provide a better DQE. CDRAD analysis basically confirms that the structured phosphor used in the Velocity system improves the visibility of some details. This is especially true for medium and large details.

Citation Download Citation

Stefano Rivetti, Nico Lanconelli, Marco Bertolini, Giovanni Borasi, Domenico Acchiappati, and Aldo Burani M.D. "Performance evaluation of a direct computed radiography system by means of physical characterization and contrast detail analysis", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65104M (19 March 2007); https://doi.org/10.1117/12.710523

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