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Dual-energy imaging using a photon counting detector with electronic spectrum-splitting - art. no. 61421H
KTH, School of Engineering Sciences (SCI), Physics, Medical Imaging.
2006 (English)In: Medical Imaging 2006: Physics of Medical Imaging, Pts 1-3 / [ed] Flynn, MJ; Hsieh, J, 2006, Vol. 6142, H1421-H1421 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a dual-energy imaging technique optimized for contrast-enhanced mammography using a photon counting detector. Each photon pulse is processed separately in the detector and the addition of an electronic threshold near the middle of the energy range of the x-ray spectrum allows discrimination of high and low energy photons. This effectively makes the detector energy sensitive, and allows the acquisition of high- and low-energy images simultaneously. These high- and low-energy images can be combined to dual-energy images where the anatomical clutter has been suppressed. By setting the electronic threshold close to 33.2 keV (the k-edge of iodine) the system is optimized for dual-energy contrast-enhanced imaging of breast tumors. Compared to other approaches, this method not only eliminates the need for separate exposures that might lead to motion artifacts, it also eliminates the otherwise deteriorating overlap between high- and low-energy spectra. We present phantom dual-energy images acquired on a prototype system to illustrate that the technique is already operational, albeit in its infancy. We also present a theoretical estimation of the potential gain in tumor signal-difference-to-noise ratio when using this electronic spectrum-splitting method as opposed to acquiring the high- and low-energy images separately with double exposures with separate x-ray spectra. Assuming ideal energy sensitive photon counting detectors, we arrive at the conclusion that the signal-difference-to-noise ratio could be increased by 145% at constant dose. We also illustrate our results on synthetic images.

Place, publisher, year, edition, pages
2006. Vol. 6142, H1421-H1421 p.
Series
PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE), ISSN 0277-786X ; 6142
Keyword [en]
digital mammography, contrast-media, experience, images
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-41968DOI: 10.1117/12.649799ISI: 000238049700051Scopus ID: 2-s2.0-33745423630ISBN: 978-081946185-8 (print)OAI: oai:DiVA.org:kth-41968DiVA: diva2:445625
Conference
edical Imaging 2006 Conference. San Diego, CA. FEB 12-14, 2006
Note
QC 20111004Available from: 2011-10-04 Created: 2011-10-04 Last updated: 2011-10-04Bibliographically approved

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