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Direct Measurement of Mammographic X-Ray Spectra with a Digital CdTe Detection System

  • Autori: Abbene, L.; Gerardi, G.; Principato, F.; Del Sordo, S.; Raso, G.
  • Anno di pubblicazione: 2012
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: X-ray spectroscopy; high photon counting rate; CdTe detectors; digital pulse processing; mammography
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In this work we present a detection system, based on a CdTe detector and an innovative digital pulse processing (DPP) system, for high-rate X-ray spectroscopy in mammography (1–30 keV). The DPP system performs a height and shape analysis of the detector pulses, sampled and digitized by a 14-bit, 100 MHz ADC. We show the results of the characterization of the detection system both at low and high photon counting rates by using monoenergetic X-ray sources and a nonclinical X-ray tube. The detection system exhibits excellent performance up to 830 kcps with an energy resolution of 4.5% FWHM at 22.1 keV. Direct measurements of clinical molybdenum X-ray spectra were carried out by using a pinhole collimator and a custom alignment device. A comparison with the attenuation curves and the half value layer values, obtained from the measured and simulated spectra, from an ionization chamber and from a solid state dosimeter, also shows the accuracy of the measurements. These results make the proposed detection system a very attractive tool for both laboratory research, calibration of dosimeters and advanced quality controls in mammography.