Dual energy imaging in mammography: Cross-talk study in a Si array detector

G. Baldazzi, D. Bollini, M. Gambaccini, M. Gombia, L. Ramello, A. Tuffanelli

Risultato della ricerca: Contributo su rivistaArticolo da conferenzapeer review

Abstract

One of the main limitation to the extensive use of breast-cancer screening as a prevention method is the relatively high X-ray dose released to the patient. A new approach is under study in which two quasi-monochromatic beams - with mean energies of 18.0 and 36.0 keV - are produced simultaneously, starting from an X-ray tube, by means of a monochromator based on a pyrolytic graphite crystal. The two beams are superimposed in space. The removal of the energy components with low content of diagnostic information from the spectrum, leads to a reduction of the dose released to patients maintaining (or improving) the image quality. The two quasi-monochromatic beams impinge on the patient and then are detected with a solid-state array detector; the image results as the difference between the transmitted intensities of the two detected beams. In this work, the performances of two different electronic readouts and three pixel widths of a silicon position sensitive array detector are simulated and described in order to minimize cross-talk effects between adjacent pixels. The use of a detector with spectrometric capabilities is necessary to separate, by means of thresholds, the high energy photons from the low energy ones.

Lingua originaleInglese
pagine (da-a)603-606
Numero di pagine4
RivistaNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume213
DOI
Stato di pubblicazionePubblicato - gen 2004
Pubblicato esternamente
Evento5th Topical Meeting on Industrial Radiation and Radioisotope (IRRMA-V) - Bologna, Italy
Durata: 9 giu 200214 giu 2002

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