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Imaging with multi-prism x-ray lenses
KTH, School of Engineering Sciences (SCI), Physics, Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Medical Imaging.ORCID iD: 0000-0002-7725-0548
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2008 (English)In: Medical Imaging 2008 - Physics of Medical Imaging: PTS 1-3 / [ed] Hsieh, J; Samei, E, 2008, Vol. 6913, 91308-91308 p.Conference paper, Published paper (Refereed)
Abstract [en]

The multi-prism lens (MPL) is a refractive x-ray lens consisting of two rows of prisms facing each other at an angle. Rays entering the lens at the periphery will encounter a larger number of prisms than will central ones, hence experiencing a greater refraction. The focusing effect of the MPL can be used to gather radiation from a large aperture onto a smaller detector, and accordingly to make better use of the available x-ray flux in medical x-ray imaging. Potential advantages of a better photon economy include shorter acquisition times, a reduced tube loading, or an improved resolution. Since the focusing effect is one-dimensional it matches the design of scanning systems. In this study we present the first images acquired with an MPL instead of the pre-breast slit collimator in a scanning mammography system. According to the measurements, the MPL is able to increase the flux 32% at equal resolution compared to the slit collimator, or to improve the resolution 2.4 mm(-1) at equal flux. If used with a custom-made absorption filter in a clinical set-up, the gain of flux of the MPL is expected to be at least 45%, and the corresponding improvement in resolution to be 3 mm(-1).

Place, publisher, year, edition, pages
2008. Vol. 6913, 91308-91308 p.
Series
Progress in Biomedical Optics and Imaging - Proceedings of SPIE, ISSN 0277-786X ; 6913
Keyword [en]
mammography, x-ray optics, multi-prism lens, pre-breast slit-collimator, x-ray flux, acquisition time, resolution
National Category
Biomedical Laboratory Science/Technology
Identifiers
URN: urn:nbn:se:kth:diva-38399DOI: 10.1117/12.770434ISI: 000256660300006Scopus ID: 2-s2.0-43149103955ISBN: 978-0-8194-7097-3 (print)OAI: oai:DiVA.org:kth-38399DiVA: diva2:437807
Conference
Medical Imaging 2008 - Physics of Medical Imaging; San Diego, CA; 18 February 2008 through 21 February 2008
Available from: 2011-08-30 Created: 2011-08-25 Last updated: 2011-08-30Bibliographically approved

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Nillius, Peter

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