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Contrast-enhanced dual-energy mammography using a scanned multislit system: evaluation of a differential beam filtering technique

[+] Author Affiliations
Hans Bornefalk

KTH, Department of Physics, SE-106 91 Stockholm, Sweden

Magnus Hemmendorff

Sectra Mamea AB, Kistagången 2, SE-164 40 Kista, Sweden

Torbjörn Hjärn

Sectra Mamea AB, Kistagången 2, SE-164 40 Kista, Sweden

J. Electron. Imaging. 16(2), 023006 (April 18, 2007). doi:10.1117/1.2727497
History: Received April 26, 2006; Revised November 23, 2006; Accepted January 09, 2007; Published April 18, 2007
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This paper describes a method for single-exposure, contrast-enhanced dual-energy imaging of tumors utilizing a scanned multislit system for digital mammography. This photon-counting system employs an array of silicon strip detectors mounted in an edge-on geometry. The line detectors and pre- and post-collimator slits are carefully aligned, and the multislit setup 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.

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© 2007 SPIE and IS&T

Citation

Hans Bornefalk ; Magnus Hemmendorff and Torbjörn Hjärn
"Contrast-enhanced dual-energy mammography using a scanned multislit system: evaluation of a differential beam filtering technique", J. Electron. Imaging. 16(2), 023006 (April 18, 2007). ; http://dx.doi.org/10.1117/1.2727497


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