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.