In-plane image quality and NPWE detectability index in digital breast tomosynthesis.

Details

Serval ID
serval:BIB_1305AC038732
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
In-plane image quality and NPWE detectability index in digital breast tomosynthesis.
Journal
Physics in medicine and biology
Author(s)
Monnin P., Verdun F.R., Bosmans H., Marshall N.W.
ISSN
1361-6560 (Electronic)
ISSN-L
0031-9155
Publication state
Published
Issued date
07/05/2020
Peer-reviewed
Oui
Volume
65
Number
9
Pages
095013
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
A rigorous 2D analysis of signal and noise transfer applied to reconstructed planes in digital breast tomosynthesis (DBT) is necessary for system characterization and optimization. This work proposes a method for assessing technical image quality and system detective quantum efficiency (DQE <sub>sys</sub> ) for reconstructed planes in DBT. Measurements of 2D in-plane modulation transfer function (MTF) and noise power spectrum (NPS) were made on five DBT systems using different acquisition parameters, reconstruction algorithms and plane spacing. This work develops the noise equivalent quanta (NEQ), DQE <sub>sys</sub> and detectability index (d') calculated using a non-prewhitening model observer with eye filter (NPWE) for reconstructed DBT planes. The images required for this implementation were acquired using a homogeneous test object of thickness 40 mm poly(methyl) methacrylate plus 0.5 mm Al; 2D MTF was calculated from an Al disc of thickness 0.2 mm and diameter 50 mm positioned within the phantom. The radiant contrast of the MTF disc and the air kerma at the system input were used as normalization factors. The NPWE detectability index was then compared to the in-plane contrast-detail (c-d) threshold measured using the CDMAM phantom. The MTF and NPS measured on the different systems showed a strong anisotropy, consistent with the cascaded models developed in the literature for DBT. Detectability indices calculated from the measured MTF and NPS successfully predicted changes in c-d detectability for details between 0.1 mm and 2.0 mm, for DBT plane spacings between 0.5 mm and 10 mm, and for air kerma values at the system input between 157 µGy and 1170 μGy. The linear Pearson correlation between the detectability index and threshold gold thickness of the CDMAM phantom was -0.996. The method implements a parametric means of assessing the technical image quality of reconstructed DBT planes, providing valuable information for optimization of DBT systems.
Pubmed
Web of science
Open Access
Yes
Create date
10/07/2020 15:00
Last modification date
01/03/2021 7:28
Usage data