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Proceedings Paper

Dual-energy imaging using a digital scanned multi-slit system for mammography: evaluation of a differential beam filtering technique
Author(s): Hans Bornefalk; Magnus Hemmendorff; Torbjörn Hjärn
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Paper Abstract

This paper describes a method for single exposure contrast-enhanced dual-energy imaging of tumors utilizing a scanned multi-slit system for digital mammography. This photon counting system employs an array of silicon strip detectors in an edge-on geometry. In the multi-slit setup, the line detectors and pre-collimator slits are aligned orthogonal to the scan direction. This geometry is advantageous to dual-energy imaging, since it allows differential filtering of the x-ray beam in the pre-collimator slits. A high-energy image is constructed from those lines where the filter material has been chosen to harden the x-ray beam and the low-energy image from the lines with a filter producing softer beams. Both images are obtained in the same scan, eliminating the need to change tube voltages and anode materials and minimizing the risk of motion artifacts. The method is illustrated on a purpose-built phantom and logarithmic subtraction of the images produces images essentially free of anatomical clutter with the contrast-enhanced targets clearly visible.

Paper Details

Date Published: 2 March 2006
PDF: 7 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61422O (2 March 2006); doi: 10.1117/12.649513
Show Author Affiliations
Hans Bornefalk, Kungliga Tekniska Högskolan (Sweden)
Magnus Hemmendorff, Sectra Mamea AB (Sweden)
Torbjörn Hjärn, Sectra Mamea AB (Sweden)

Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

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