Imaging with multi-prism x-ray lenses

Erik Fredenberg; Björn Cederström; Magnus Åslund; Peter Nillius; Mats Lundqvist; Mats Danielsson

doi:10.1117/12.770434

18 March 2008 Imaging with multi-prism x-ray lenses

Erik Fredenberg, Björn Cederström, Magnus Åslund, Peter Nillius, Mats Lundqvist, Mats Danielsson

Proceedings Volume 6913, Medical Imaging 2008: Physics of Medical Imaging; 691308 (2008) https://doi.org/10.1117/12.770434
Event: Medical Imaging, 2008, San Diego, California, United States

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.

Citation Download Citation

Erik Fredenberg, Björn Cederström, Magnus Åslund, Peter Nillius, Mats Lundqvist, and Mats Danielsson "Imaging with multi-prism x-ray lenses", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 691308 (18 March 2008); https://doi.org/10.1117/12.770434

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