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Proceedings Paper

A noise decomposition method for image quality analysis of medical radiography detectors
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Paper Abstract

Signal and noise transfer properties of x-ray detectors are described by the detective quantum efficiency DQE. The DQE is a precise analysis tool, however, it is not meant to identify the various noise sources. The noise decomposition method is based on measured noise power spectra, following previous work by Mackenzie. Noise is distinguished by its variations with dose and spatial frequency: Quantum noise, fixed pattern noise, Lubberts noise, noise aliasing, and others. By determining all major noise sources, DQE results can be extrapolated within a precision of approximately 2% to other clinical relevant dose values that have not been measured. This precision shows an improvement to the method proposed by Mackenzie. The major noise sources are further sub-divided. For the calculation of noise sub-components a precision of 4% is achieved. The decomposition allows a detailed analysis of the dominant noise component in a certain dose or spatial frequency range, in particular the determination of spectral noise equivalent dose, the impact on DQE by different gain and offset correction schemes, and the influence of different scintillators on Lubberts noise.

Paper Details

Date Published: 13 March 2009
PDF: 12 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72582P (13 March 2009); doi: 10.1117/12.812255
Show Author Affiliations
Sami Al Tahli, Philips Medical Systems DMC GmbH (Germany)
Ingo Maack, Philips Medical Systems DMC GmbH (Germany)
Andreas Koch, Philips Medical Systems DMC GmbH (Germany)
Clemens Herrmann, Philips Medical Systems DMC GmbH (Germany)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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