title: CdZnTe detector in mammographic x-ray spectroscopy.
abstract: A CdZnTe (CZT) detector was utilized in mammographic x-ray spectroscopy under clinical conditions. First, the detector response was investigated using y-rays from 241Am. The escape of secondary (Compton scattered and K fluorescent) x-rays and tailing due to carrier trapping were minor in the mammographic energy range. In addition, the transmission of primary x-rays was minimal from the results calculated using the mass attenuation coefficients of CZT. Therefore, spectral distortion in this energy range was expected to be negligible. Secondly, x-ray spectroscopy was carried out with the CZT detector. The measured spectra were in good agreement with the spectra obtained with the Compton-scatter method with a high-purity germanium detector. Moreover, the half-value layers (HVLs) calculated from the CZT spectra were consistent with the HVLs measured with an ionization chamber. The results indicate that a CZT detector can be utilized in mammographic x-ray spectroscopy without any corrections.
authors.affiliation: Graduate School of Medicine, Course of Health Sciences, Osaka University, Suita, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Miyajima
authors.forename: Kotaro
authors.initials: K
authors.lastname: Imagawa
mesh_terms: D002104:Cadmium; D007554:Isotopes; D008327:Mammography / Q000295:instrumentation* / Q000379:methods; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013052:Spectrometry, X-Ray Emission / Q000295:instrumentation*; D013691:Tellurium; D014965:X-Rays; D015032:Zinc
chemical_list: C474490:CdZnTe; D007554:Isotopes; D002104:Cadmium; D015032:Zinc; D013691:Tellurium