A comprehensive model for quantum noise characterization in digital mammography
| Autor: | Nicholas Marshall, Francis R. Verdun, Hilde Bosmans, P. Monnin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Noise power Radiological and Ultrasound Technology Pixel business.industry Detector Quantum noise Signal-To-Noise Ratio Photon counting 030218 nuclear medicine & medical imaging Mammography/instrumentation Mammography/methods Mammography/standards Radiographic Image Enhancement/instrumentation Radiographic Image Enhancement/methods Radiographic Image Enhancement/standards Radiographic Image Enhancement Detective quantum efficiency 03 medical and health sciences 0302 clinical medicine Optics 030220 oncology & carcinogenesis Optical transfer function Radiology Nuclear Medicine and imaging business Decorrelation Mammography |
| Zdroj: | Physics in medicine and biology, vol. 61, no. 5, pp. 2083-2108 |
| Popis: | 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. journal_title: Physics in Medicine and Biology article_type: paper article_title: A comprehensive model for quantum noise characterization in digital mammography copyright_information: © 2016 Institute of Physics and Engineering in Medicine license_information: cc-by Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. date_received: 2015-10-06 date_accepted: 2016-01-05 date_epub: 2016-02-19 ispartof: Physics in Medicine and Biology vol:61 issue:5 pages:2083-108 ispartof: location:England status: published |
| Databáze: | OpenAIRE |
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