A comprehensive model for quantum noise characterization in digital mammography.

Details

Serval ID
serval:BIB_63AA4CBE942B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A comprehensive model for quantum noise characterization in digital mammography.
Journal
Physics in medicine and biology
Author(s)
Monnin P., Bosmans H., Verdun F.R., Marshall N.W.
ISSN
1361-6560 (Electronic)
ISSN-L
0031-9155
Publication state
Published
Issued date
07/03/2016
Peer-reviewed
Oui
Volume
61
Number
5
Pages
2083-2108
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
A version of cascaded systems analysis was developed specifically with the aim of studying quantum noise propagation in x-ray detectors. Signal and quantum noise propagation was then modelled in four types of x-ray detectors used for digital mammography: four flat panel systems, one computed radiography and one slot-scan silicon wafer based photon counting device. As required inputs to the model, the two dimensional (2D) modulation transfer function (MTF), noise power spectra (NPS) and detective quantum efficiency (DQE) were measured for six mammography systems that utilized these different detectors. A new method to reconstruct anisotropic 2D presampling MTF matrices from 1D radial MTFs measured along different angular directions across the detector is described; an image of a sharp, circular disc was used for this purpose. The effective pixel fill factor for the FP systems was determined from the axial 1D presampling MTFs measured with a square sharp edge along the two orthogonal directions of the pixel lattice. Expectation MTFs were then calculated by averaging the radial MTFs over all possible phases and the 2D EMTF formed with the same reconstruction technique used for the 2D presampling MTF. The quantum NPS was then established by noise decomposition from homogenous images acquired as a function of detector air kerma. This was further decomposed into the correlated and uncorrelated quantum components by fitting the radially averaged quantum NPS with the radially averaged EMTF(2). This whole procedure allowed a detailed analysis of the influence of aliasing, signal and noise decorrelation, x-ray capture efficiency and global secondary gain on NPS and detector DQE. The influence of noise statistics, pixel fill factor and additional electronic and fixed pattern noises on the DQE was also studied. The 2D cascaded model and decompositions performed on the acquired images also enlightened the observed quantum NPS and DQE anisotropy.

Keywords
Mammography/instrumentation, Mammography/methods, Mammography/standards, Radiographic Image Enhancement/instrumentation, Radiographic Image Enhancement/methods, Radiographic Image Enhancement/standards, Signal-To-Noise Ratio
Pubmed
Open Access
Yes
Create date
16/02/2016 17:19
Last modification date
20/08/2019 14:20
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