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Proceedings Paper

Imaging with multi-prism x-ray lenses
Author(s): Erik Fredenberg; Björn Cederström; Magnus Åslund; Peter Nillius; Mats Lundqvist; Mats Danielsson
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Paper Abstract

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.

Paper Details

Date Published: 18 March 2008
PDF: 11 pages
Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 691308 (18 March 2008); doi: 10.1117/12.770434
Show Author Affiliations
Erik Fredenberg, AlbaNova Univ. Ctr. (Sweden)
Björn Cederström, AlbaNova Univ. Ctr. (Sweden)
Magnus Åslund, Sectra Mamea AB (Sweden)
Peter Nillius, AlbaNova Univ. Ctr. (Sweden)
Mats Lundqvist, Sectra Mamea AB (Sweden)
Mats Danielsson, AlbaNova Univ. Ctr. (Sweden)

Published in SPIE Proceedings Vol. 6913:
Medical Imaging 2008: Physics of Medical Imaging
Jiang Hsieh; Ehsan Samei, Editor(s)

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