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Proceedings Paper

Digital system based on a bichromatic x-ray source and a single-photon counting device: a single-exposure dual-energy mammography approach
Author(s): Maria Giuseppina Bisogni; S. Fabbri; Mauro Gambaccini; Michele Marziani; Marzia Novelli; Mariagrazia Quattrocchi; Valeria Rosso; Paolo Russo; A. Sarnelli; Arnaldo Stefanini; Sergio Zucca
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Paper Abstract

In this work we exploit the advantages of using a bi-chromatic X-rays source coupled with a single photon counting pixel detector to perform a feasibility study for dual energy mammography. This technique allows enhancing the contrast between different breast tissues by composing two images acquired at two different energies. The high and low energy images have been acquired by a single X-ray shot. The bi-chromatic beam has been produced per diffraction of polychromatic photons by a monochromator crystal. The imaging system is based on a single photon counting silicon pixel detector. The data read-out is performed by a VLSI Integrated Circuit bump-bonded to the sensor. The energy threshold of each electronics channel can be individually trimmed. We set the threshold of one pixel below 16 keV while the threshold of the neighboring pixel between 16 and 32 keV. With a single exposure the information from both energies is recorded. After separation between low and high threshold pixels, we obtained two independent images. We acquired radiographs of phantoms made of three different materials. Appling a dual energy algorithm, we obtained synthesized images where any of the three materials is removed from the radiograph, enhancing the contrast between the two remaining.

Paper Details

Date Published: 3 May 2002
PDF: 13 pages
Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); doi: 10.1117/12.465607
Show Author Affiliations
Maria Giuseppina Bisogni, Univ. degli Studi di Pisa and INFN (Italy)
S. Fabbri, Univ. degli Studi di Ferrara and INFN (Italy)
Mauro Gambaccini, Univ. degli Studi di Ferrara and INFN (Italy)
Michele Marziani, Univ. degli Studi di Ferrara and INFN (Italy)
Marzia Novelli, Univ. degli Studi di Pisa and INFN (Italy)
Mariagrazia Quattrocchi, Univ. degli Studi di Napoli and INFN (Italy)
Valeria Rosso, Univ. degli Studi di Pisa and INFN (Italy)
Paolo Russo, Univ. degli Studi di Napoli and INFN (Italy)
A. Sarnelli, Univ. degli Studi di Napoli and INFN (Italy)
Arnaldo Stefanini, Univ. degli Studi di Pisa and INFN (Italy)
Sergio Zucca, Univ. degli Studi di Pisa and INFN Sezione di Pisa (Italy)


Published in SPIE Proceedings Vol. 4682:
Medical Imaging 2002: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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