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RESEARCH PRODUCT
Direct Measurement of Mammographic X-Ray Spectra with a Digital CdTe Detection System
Gaetano GerardiLeonardo AbbeneStefano Del SordoGiuseppe RasoFabio Principatosubject
digital pulse processingmammographyAnalytical chemistrylcsh:Chemical technologyBiochemistryArticleAnalytical ChemistryCdTe detectorsCdTe detectorOpticsmedicineCadmium CompoundsMammographylcsh:TP1-1185Computer SimulationElectrical and Electronic EngineeringInstrumentationPhysicsDosimetermedicine.diagnostic_testbusiness.industryAttenuationSpectrum AnalysisX-RaysDetectorSettore FIS/01 - Fisica Sperimentalehigh photon counting rateCdTe detectors Digital Pulse Processing MammographySignal Processing Computer-AssistedAtomic and Molecular Physics and OpticsPhoton countingSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Full width at half maximumX-ray spectroscopy; high photon counting rate; CdTe detectors; digital pulse processing; mammographyIonization chamberX-ray spectroscopyTelluriumbusinessHalf-value layerdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-06-18 | Sensors; Volume 12; Issue 6; Pages: 8390-8404 |