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首页> 外文期刊>Journal of Nuclear Physics, Material Sciences, Radiation and Applications >Application of a CdTe Detector for Measurements of Mammographic X-ray Spectra
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Application of a CdTe Detector for Measurements of Mammographic X-ray Spectra

机译：CdTe检测器在乳腺X射线光谱测量中的应用

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This work aims to characterize mammographic x-ray beams incident and transmitted by breast phantoms (from 0 to 45 mm) composed from known proportion of glandular and adipose tissue-equivalent materials. This study was performed for mammographic x-ray beams generated by a mammography equipment using different target/filter combinations (Mo/Mo, Mo/Rh and W/Rh). It was studied the modification of spectra shape of the beams transmitted through different thicknesses of these materials. It was also evaluated the penetrability of these transmitted beams by its correlations to the HVL, which were experimentally estimated and derived from the x-ray spectra measured using a spectrometry system with a CdTe detector. The x-ray spectra transmitted by the phantom with higher density presented lower intensity than those transmitted by those with lower density, as expected. The differences between the HVL values derived from the spectra and those estimated using air kerma measurements are lesser than 6% for about 88% of the spectra measured in this work. The expected spectra variations with phantom thickness, revealed by the measured transmitted x-ray spectra, were also confirmed by HVL measurements and agree with the estimated attenuation curves. The motivation of the study was related to the robustness of the spectra as a descriptor of radiation beams and the possibility of using these transmitted spectra for dose assessment related to mammographic procedures. We can conclude that developed method is able to characterize mammographic x-ray beams making it possible the use of this kind of data for dose assessment in mammography.
机译：这项工作旨在表征由已知比例的腺体和脂肪组织等效材料组成的乳腺体模（从0到45 mm）入射和透射的X射线摄影X射线束的特征。这项研究是针对使用不同靶标/滤光片组合（Mo / Mo，Mo / Rh和W / Rh）的乳腺X线照相设备产生的乳腺X射线束进行的。研究了通过这些材料的不同厚度透射的光束的光谱形状的改变。还通过与HVL的相关性评估了这些透射光束的穿透性，这些相关性是通过实验估算并从使用带有CdTe检测器的光谱系统测量的X射线光谱得出的。正如预期的那样，具有较高密度的体模透射的X射线光谱的强度低于具有较低密度的体模透射的X射线的强度。对于这项工作中测得的约88％的光谱，从光谱得出的HVL值与使用空气比释动能测量值估计的HVL值之间的差异小于6％。通过测量的透射X射线光谱显示的预期的幻像厚度光谱变化也通过HVL测量得到证实，并且与估计的衰减曲线一致。这项研究的动机与作为辐射束描述符的光谱的鲁棒性以及使用这些透射光谱进行与乳腺X线摄影术相关的剂量评估的可能性有关。我们可以得出结论，发达的方法能够表征乳腺X射线束，从而有可能在乳腺X射线摄影中使用此类数据进行剂量评估。

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