TY - JOUR
T1 - Dual energy imaging in mammography
T2 - 5th Topical Meeting on Industrial Radiation and Radioisotope (IRRMA-V)
AU - Baldazzi, G.
AU - Bollini, D.
AU - Gambaccini, M.
AU - Gombia, M.
AU - Ramello, L.
AU - Tuffanelli, A.
N1 - Funding Information:
This work has been supported by MURST – COFIN 2000, Italy in the frame of a collaboration research program of Italian Universities and by National Institute of Nuclear Physics (INFN).
PY - 2004/1
Y1 - 2004/1
N2 - 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.
AB - 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.
KW - Digital radiography
KW - Mammography
KW - Medical imaging equipment
KW - Solid-state detectors
UR - http://www.scopus.com/inward/record.url?scp=0242662369&partnerID=8YFLogxK
U2 - 10.1016/S0168-583X(03)01654-9
DO - 10.1016/S0168-583X(03)01654-9
M3 - Conference article
SN - 0168-583X
VL - 213
SP - 603
EP - 606
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Y2 - 9 June 2002 through 14 June 2002
ER -