The use of cadmium telluride detectors for the qualitative analysis of diagnostic x-ray spectra

Abstract

A method is introduced for the evaluation of x-ray spectra from x-ray machines operating in the range 50-100 kVp using a cadmium telluride (CdTe) detector with low detection efficiency. The pulse height distribution obtained with this kind of detector does not represent the true photon spectra owing to the presence of K-escape, Compton scattering, etc.; these effects were evaluated using a Monte Carlo method. A stripping procedure is described for implementation on a Univac 1100/82 computer. The validity of our method was finally tested by comparison with experimental results obtained with a Ge detector and with data from the literature; the results are in good agreement with published data.

Spectral correction algorithm for multispectral CdTe x-ray detectors

“…This was useful to determine the best value for the parameter a and b in Eqs. (13). In theory a and b should be equal to the size of the anode pad.…”

“…Further, we develop a model to account for a flux dependent incomplete charge collection. The algorithm corrects each pixel's spectrum individually and is based on the method of stripping, 13 correcting for each distorting effects independently. Our aim is that we with this algorithm are able to correct the measured spectra for distorting effects effectively, fast, and reliable, making the method applicable in applications like luggage screening.…”

Application of a semi-empirical model for the evaluation of transmission properties of barite mortar

“…The measured spectra were corrected by the response function of the detector using the stripping procedure (Di Castro et al, 1984) implemented using a Matlab program. This procedure takes into account the K-escape, Compton scattering and detector efficiency corrections.…”

Determinação da camada semirredutora e da tensão aplicada a partir de espectros emitidos por um tubo de raios X

“…O método de referência para medição da CSR na faixa de energias de diagnóstico por imagem utiliza uma câmara de ionização calibrada e filtros de Al ou Cu de alto grau de pureza 13 . Alternativamente, é possível estimar a CSR de feixes de raios X a partir dos espectros medidos, após sua adequada correção e conversão para unidades de kerma no ar 14 .…”