Author/Authors :
Arfelli، نويسنده , , F. and Barbiellini، نويسنده , , G. and Cantatore، نويسنده , , G. and Castelli، نويسنده , , E. and Dalla Palma، نويسنده , , L. and Di Michiel، نويسنده , , M. and Longo، نويسنده , , R. and Poropat، نويسنده , , P. and Rosei، نويسنده , , R. and Sessa، نويسنده , , M. and Tromba، نويسنده , , G. and Vacchi، نويسنده , , A.، نويسنده ,
Abstract :
The knowledge of the dose and of the energy spectrum of the X-rays delivered to the patient during a radiological examination allows in principle the computation of the number of photons per unit surface useful for a good mammography. The film-screen assembly detectors used in the present standard practice require a number of photons per unit surface which, from a statistical point of view, would be unnecessarily high if single photon counting detectors with efficiency near to one were available. We discuss a possible solid state detector with these characteristics. Moreover, we propose the use of an X-ray monochromatic beam from a synchrotron radiation source in order to perform the examination at the energy where the signal to noise ratio has a maximum. Using the proposed detector in such a beam a substantial dose reduction can be foreseen.
