Digital system based on a bichromatic x-ray source and a single-photon counting device: a single-exposure dual-energy mammography approach

Maria Giuseppina Bisogni; S. Fabbri; Mauro Gambaccini; Michele Marziani; Marzia Novelli; Mariagrazia Quattrocchi; Valeria Rosso; Paolo Russo; A. Sarnelli; Arnaldo Stefanini; Sergio Zucca

doi:10.1117/12.465607

3 May 2002 Digital system based on a bichromatic x-ray source and a single-photon counting device: a single-exposure dual-energy mammography approach

Maria Giuseppina Bisogni, S. Fabbri, Mauro Gambaccini, Michele Marziani, Marzia Novelli, Mariagrazia Quattrocchi, Valeria Rosso, Paolo Russo, A. Sarnelli, Arnaldo Stefanini, Sergio Zucca

Author Affiliations +

Proceedings Volume 4682, Medical Imaging 2002: Physics of Medical Imaging; (2002) https://doi.org/10.1117/12.465607
Event: Medical Imaging 2002, 2002, San Diego, California, United States

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.

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Maria Giuseppina Bisogni, S. Fabbri, Mauro Gambaccini, Michele Marziani, Marzia Novelli, Mariagrazia Quattrocchi, Valeria Rosso, Paolo Russo, A. Sarnelli, Arnaldo Stefanini, and Sergio Zucca "Digital system based on a bichromatic x-ray source and a single-photon counting device: a single-exposure dual-energy mammography approach", Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); https://doi.org/10.1117/12.465607

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