Mammography Grid Performance

Rezentes, Paul S.; Almeida, Adelaide de; Barnes, Gary T.

doi:10.1148/radiology.210.1.r99dc35227

Cited by 61 publications

(49 citation statements)

References 14 publications

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“…The primary grid transmission (T p ), which varied between 0.75 and 0.77 for the two systems, increases with the beam energy whereas the total grid transmission (T t ) for PS beams falls from 0.60 to 0.43 with increasing SF in (table 5), consistent with previous work (Rezentes et al 1999, Carton et al 2009, Salvagnini et al 2012. The T s values measured in this study are within the range expected for mammography grids (Shen et al 2006, Aichinger et al 2012.…”

Section: Scatter Fraction In the Image (Sf Out ) And Grid Characterizsupporting

confidence: 91%

A comprehensive model for x-ray projection imaging system efficiency and image quality characterization in the presence of scattered radiation

et al. 2017

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A comprehensive model for x-ray projection imaging system efficiency and image quality characterization in the presence of scattered radiation AbstractThis work proposes a method for assessing the detective quantum efficiency (DQE) of radiographic imaging systems that include both the x-ray detector and the antiscatter device. Cascaded linear analysis of the antiscatter device efficiency (DQE ASD ) with the x-ray detector DQE is used to develop a metric of system efficiency (DQE sys ); the new metric is then related to the existing system efficiency parameters of effective DQE (eDQE) and generalized DQE (gDQE). The effect of scatter on signal transfer was modelled through its point spread function (PSF), leading to an x-ray beam transfer function (BTF) that multiplies with the classical presampling modulation transfer function (MTF) to give the system MTF. Expressions are then derived for the influence of scattered radiation on signal-difference to noise ratio (SDNR) and contrast-detail (c-d) detectability.The DQE sys metric was tested using two digital mammography systems, for eight x-ray beams (four with and four without scatter), matched in terms of effective energy. The model was validated through measurements of contrast, SDNR and MTF for poly(methyl)methacrylate thicknesses covering the range of scatter fractions expected in mammography. The metric also successfully predicted changes in c-d detectability for different scatter conditions. Scatter Institute of Physics and Engineering in MedicineOriginal 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. 5 Author to whom any correspondence should be addressed. fractions for the four beams with scatter were established with the beam stop method using an extrapolation function derived from the scatter PSF, and validated through Monte Carlo (MC) simulations. Low-frequency drop of the MTF from scatter was compared to both theory and MC calculations. DQE sys successfully quantified the influence of the grid on SDNR and accurately gave the break-even object thickness at which system efficiency was improved by the grid. The DQE sys metric is proposed as an extension of current detector characterization methods to include a performance evaluation in the presence of scattered radiation, with an antiscatter device in place.

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Section: Scatter Fraction In the Image (Sf Out ) And Grid Characterizsupporting

confidence: 91%

A comprehensive model for x-ray projection imaging system efficiency and image quality characterization in the presence of scattered radiation

et al. 2017

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“…The cellular grid implemented here has better performance than the linear grid as expected. The very low scatter found with this set up when comparing with other cellular grid [6] can be attributed to wider septa and interspace. This also eliminates the increased scatter at the edges of CDMAM discussed previously.…”

Section: Discussionmentioning

confidence: 62%

“…Contrast improvement factors (CIF) of 1.50 and 1.60 was measured for GE and Hologic anti scatter grids respectively. Ratios of CIF between linear and cellular grids found by [6] varies from 0.91 to 0.95 for different thickness of breast phantoms for 30kVp. In this work, the ratio of the CIF values of the GE and Hologic grids is 0.937.…”

Section: Resultsmentioning

confidence: 96%

Monte Carlo Simulation of Scatter Field for Calculation of Contrast of Discs in Synthetic CDMAM Images

Díaz

Yip

Cabello

et al. 2010

Digital Mammography

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Abstract. This paper reports on a further development of an image simulation chain, and in particular, the inclusion of contrast degradation across an image using scatter to primary ratios calculated using Monte Carlo simulation. The Monte Carlo technique, using the Geant4 toolkit, has been implemented to model the scatter conditions when imaging the CDMAM phantom with commercial digital mammography. Observed differences between linear and cellular anti scatter grid are presented and discussed. These results support previous assumptions taken by Yip et al.[1].Key words: Digital Mammography, Monte Carlo simulations, Scatter, anti-scatter grids, CDMAM phantom.Presented at IWDM'2010 (Girona, Spain) doi: 10.1007/978-3-642-13666-5 85 url: http://link.springer.com/chapter/10.1007%2F978-3-642-13666-5_85 BackgroundNew digital technologies are being developed for X-ray mammography which have the potential to improve cancer detection rates, but there is a need to investigate how these perform in comparison with conventional 2D digital mammography, and how these should be used in an optimal way. Since clinical trials to assess the performance of any mammography system are expensive, there is great interest in the development of computer-based models of the breast and imaging systems which can be used for evaluation and optimisation.

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“…3. Grids [5] designed for mammography reduce scattered radiation and improve subject contrast at the cost of higher breast dose [13,14]. Grids are used for contact (nonmagnification) imaging to reduce noise contributed by scatter.…”

Section: Digital Mammography Image Acquisitionmentioning

confidence: 99%

ACR–AAPM–SIIM Practice Guideline for Determinants of Image Quality in Digital Mammography

et al. 2012

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Mammography Grid Performance

Cited by 61 publications

References 14 publications

A comprehensive model for x-ray projection imaging system efficiency and image quality characterization in the presence of scattered radiation

A comprehensive model for x-ray projection imaging system efficiency and image quality characterization in the presence of scattered radiation

Monte Carlo Simulation of Scatter Field for Calculation of Contrast of Discs in Synthetic CDMAM Images

ACR–AAPM–SIIM Practice Guideline for Determinants of Image Quality in Digital Mammography

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