CdZnTe detector in mammographic x-ray spectroscopy

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 mammogr...

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Bibliographic Details
Published in:Physics in medicine & biology 2002-11, Vol.47 (22), p.3959-3972
Main Authors: Miyajima, Satoshi, Imagawa, Kotaro
Format: Article
Language:English
Subjects:
Biological and medical sciences
Cadmium
Isotopes
Mammography - instrumentation
Mammography - methods
Medical sciences
Phantoms, Imaging
Radiation Dosage
Radiographic Image Enhancement - instrumentation
Radiometry - instrumentation
Radiometry - methods
Reproducibility of Results
Sensitivity and Specificity
Spectrometry, X-Ray Emission - instrumentation
Tellurium
X-Rays
Zinc
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Summary: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.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/47/22/304