Noise analysis of full field digital mammography systems

V. Ravaglia; R. Bouwman; K. Young; R. Van Engen; B. Lazzari

doi:10.1117/12.812404

13 March 2009 Noise analysis of full field digital mammography systems

V. Ravaglia, R. Bouwman, K. Young, R. Van Engen, B. Lazzari

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72581B (2009) https://doi.org/10.1117/12.812404
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

In digital mammography noise characteristics are measured in quality control procedures. In the European Guidelines a method of measurement to investigate noise in digital mammography systems was proposed to evaluate the presence of additional noise beside quantum noise. However this method of noise analysis does not discriminate sufficiently between systems with and without additional noise. Therefore a different noise analysis is proposed. In this analysis the noise of a digital system is subdivided into three components: electronic, quantum and structured noise and the noise dose dependency of these components is studied. The usefulness of this analysis in both the frequency and spatial domain is investigated on a number of DR and CR systems. The results show that large differences between digital mammography systems exists. Some systems do have a large range in detector dose for which quantum noise is the largest noise component. For one system however, electronic and structured noise are more dominant. In addition to the differences between systems smaller differences in noise characteristics exist between different target-filter combinations on a particular system. These differences might be attributed to the limited flatfield calibration, the heel effect and difference in sensitivity. The noise analysis in both the frequency and spatial domain give useful information about the noise characteristics of systems. The analysis in the spatial domain is relatively easy to perform and to interpret. This analysis might be suitable for QC purposes. The analysis in the frequency domain does give additional information and might be used for thorough investigations.

Citation Download Citation

V. Ravaglia, R. Bouwman, K. Young, R. Van Engen, and B. Lazzari "Noise analysis of full field digital mammography systems", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72581B (13 March 2009); https://doi.org/10.1117/12.812404

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