The use of detectability indices as a means of automatic exposure control for a digital mammography system

Elena Salvagnini; Hilde Bosmans; Pascal Monnin; Lara Struelens; Francis Verdun; Nicholas W. Marshall

doi:10.1117/12.878119

The use of detectability indices as a means of automatic exposure control for a digital mammography system

Elena Salvagnini, Hilde Bosmans, Pascal Monnin, Lara Struelens, Francis Verdun, Nicholas W. Marshall

Research output › peer-review

Abstract

This work examines the use of a detectability index to control an Automatic Exposure Control (AEC) system for an amorphous-Selenium digital mammography detector. The default AEC mode for the system was evaluated using homogeneous poly(methyl methacrylate) (PMMA) plates of thickness 20, 40, 60 and 70 mm to find the tube potential and anode/filter settings selected by the system. Detectability index (d') using a non-prewhitened model observer with eye filter (NPWE) was calculated for these beam qualities as a function of air kerma at the detector. AEC settings were calculated that gave constant d' as a function of beam quality for a homogeneous background; a target d' was used that ensured the system passed the achievable image quality criterion for the 0.1 mm diameter disc in the European Guidelines. Threshold gold thickness was measured using the CDMAM test object as a function of beam quality for the AEC mode, which held pixel value (PV) constant, and for the constant d' mode. Threshold gold thickness for the 0.1 mm disc increased by a factor of 2.18 for the constant PV mode, while constant d' mode held threshold gold thickness constant to within 7% and signal-difference-to-noise-ratio (SdNR) constant to within 5%. The constant d' settings derived for homogeneous images were then applied to a phantom with a structured background. Threshold gold thickness for the 0.13 mm disc increased by a factor of 1.90 for the constant PV mode, while constant d' mode held threshold gold thickness constant within 38% for 0.13 mm disk.

Original language	English
Title of host publication	Medical Imaging 2011
Subtitle of host publication	Physics of Medical Imaging
Place of Publication	Bellingham WA, United States
Number of pages	9
Volume	7961
DOIs	https://doi.org/10.1117/12.878119
State	Published - Mar 2011
Event	2011 - MI2011 - SPIE medical imaging: The international society for optics and photonics - Lake Buena Vista, Orlando Duration: 12 Feb 2011 → 17 Feb 2011

Publication series

Name	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	7961
ISSN (Print)	1605-7422

Conference

Conference	2011 - MI2011 - SPIE medical imaging
Country/Territory	United States
City	Orlando
Period	2011-02-12 → 2011-02-17

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Biomaterials
Radiology Nuclear Medicine and imaging

Access to Document

10.1117/12.878119License: Unspecified

Cite this

Salvagnini, E., Bosmans, H., Monnin, P., Struelens, L., Verdun, F., & Marshall, N. W. (2011). The use of detectability indices as a means of automatic exposure control for a digital mammography system. In Medical Imaging 2011: Physics of Medical Imaging (Vol. 7961). Article 79615J (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 7961).. https://doi.org/10.1117/12.878119

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title = "The use of detectability indices as a means of automatic exposure control for a digital mammography system",

abstract = "This work examines the use of a detectability index to control an Automatic Exposure Control (AEC) system for an amorphous-Selenium digital mammography detector. The default AEC mode for the system was evaluated using homogeneous poly(methyl methacrylate) (PMMA) plates of thickness 20, 40, 60 and 70 mm to find the tube potential and anode/filter settings selected by the system. Detectability index (d') using a non-prewhitened model observer with eye filter (NPWE) was calculated for these beam qualities as a function of air kerma at the detector. AEC settings were calculated that gave constant d' as a function of beam quality for a homogeneous background; a target d' was used that ensured the system passed the achievable image quality criterion for the 0.1 mm diameter disc in the European Guidelines. Threshold gold thickness was measured using the CDMAM test object as a function of beam quality for the AEC mode, which held pixel value (PV) constant, and for the constant d' mode. Threshold gold thickness for the 0.1 mm disc increased by a factor of 2.18 for the constant PV mode, while constant d' mode held threshold gold thickness constant to within 7% and signal-difference-to-noise-ratio (SdNR) constant to within 5%. The constant d' settings derived for homogeneous images were then applied to a phantom with a structured background. Threshold gold thickness for the 0.13 mm disc increased by a factor of 1.90 for the constant PV mode, while constant d' mode held threshold gold thickness constant within 38% for 0.13 mm disk.",

keywords = "AEC, Contrast-details, Detectability index, FFDM, Image quality, SdNR, Structured background",

author = "Elena Salvagnini and Hilde Bosmans and Pascal Monnin and Lara Struelens and Francis Verdun and Marshall, {Nicholas W.}",

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Salvagnini, E, Bosmans, H, Monnin, P, Struelens, L, Verdun, F & Marshall, NW 2011, The use of detectability indices as a means of automatic exposure control for a digital mammography system. in Medical Imaging 2011: Physics of Medical Imaging. vol. 7961, 79615J, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 7961, Bellingham WA, United States, 2011 - MI2011 - SPIE medical imaging, Orlando, Florida, United States, 2011-02-12. https://doi.org/10.1117/12.878119

The use of detectability indices as a means of automatic exposure control for a digital mammography system. / Salvagnini, Elena; Bosmans, Hilde; Monnin, Pascal et al.
Medical Imaging 2011: Physics of Medical Imaging. Vol. 7961 Bellingham WA, United States, 2011. 79615J (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 7961).

Research output › peer-review

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Salvagnini E, Bosmans H, Monnin P, Struelens L, Verdun F, Marshall NW. The use of detectability indices as a means of automatic exposure control for a digital mammography system. In Medical Imaging 2011: Physics of Medical Imaging. Vol. 7961. Bellingham WA, United States. 2011. 79615J. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE). doi: 10.1117/12.878119