Some diagnostic X-ray spectra and exposure measured using CdZnTe detector

The authors' purpose is to measure directly some diagnostic X-ray spectra using a low-efficiency CdZnTe (CZT) detector developed recently and to find out the fittest response function of CZT detector to correct the measured spectre. Photon spectra produced by a single-phase 2-pulse diagnostic X-ray unit driven at 50 to 100 kV and a few mA, a mammographic X-ray unit at 25 to 32 kV and 3 times of 80 mAs and X-ray computed tomography (CT) scanners at 120 kV and 3 mA have been analyzed. Corrected photon spectra were compared with the diagnostic X-ray spectral data published by Bureau of Radiological Health (BRH) measured using a Ge detector. Exposures were calculated from the photon spectra and compared with measured using an ionization chamber. These results obtained using CZT detector agreed with the diagnostic X-ray spectral data of BRH and exposures obtained by the ionization chamber. Therefore the authors think that the CdZnTe detector is able to use for quality control and quality assurance of some diagnostic X-ray units.