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Variable height multi-slit collimator and optimized image reconstruction in a photon-counting system for digital mammography
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
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2011 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 648, S216-S219 p.Article in journal (Refereed) Published
Abstract [en]

We have investigated a pre-breast collimator able to operate at variable heights for a photon-counting scanned multi-slit mammography system. A prototype system was built and used to evaluate how different collimator heights combined with optimized collimator slit widths affect dose efficiency and scan time. Moreover, new image construction software which takes into account the sub-pixel shift of each detector line was implemented and evaluated. With maintained scan time a collimator 79 mm above patient support improved dose efficiency for a 100 mu m disc by 12% and by 22% for a scan time extended by 10%. For image reconstruction and the same disc size a dose efficiency improvement of 32% +/- 9% was measured indicating a higher gain than expected. (c) 2010 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2011. Vol. 648, S216-S219 p.
Keyword [en]
Observer performance, Mammography, Photon counting, Collimator, Image reconstruction
National Category
Medical Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-99120DOI: 10.1016/j.nima.2010.11.148ISI: 000305376900055Scopus ID: 2-s2.0-79960840583OAI: oai:DiVA.org:kth-99120DiVA: diva2:541263
Note

QC 20120716

Available from: 2012-07-16 Created: 2012-07-13 Last updated: 2017-12-07Bibliographically approved

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Svensson, BjörnCederström, Björn
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Biomedical and X-ray PhysicsAlbanova VinnExcellence Center for Protein Technology, ProNova
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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