A comprehensive model for quantum noise characterization in digital mammography.

Détails

ID Serval
serval:BIB_63AA4CBE942B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
A comprehensive model for quantum noise characterization in digital mammography.
Périodique
Physics in medicine and biology
Auteur⸱e⸱s
Monnin P., Bosmans H., Verdun F.R., Marshall N.W.
ISSN
1361-6560 (Electronic)
ISSN-L
0031-9155
Statut éditorial
Publié
Date de publication
07/03/2016
Peer-reviewed
Oui
Volume
61
Numéro
5
Pages
2083-2108
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
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.

Mots-clé
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
Oui
Création de la notice
16/02/2016 18:19
Dernière modification de la notice
20/08/2019 15:20
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