Journal of Radiation Safety and Measurement

Journal of Radiation Safety and Measurement

Investigation the effect of various filters on X-ray beam at dual source CT scan by introducing Erbium as new filter

Document Type : Original Article

Authors
Ahmad Esmaili Torshabi 1
Mina Engelabi 1
Mohammad Ali Bijari 2
1 Nuclear Engineering, Faculty of Sciences and Modern Technologies, Graduate University of Advanced Technology, Kerman, Iran
2 Nuclear Engineering Group, Faculty Sciences, and Modern Technologies, Graduate University of Advanced Technology, Kerman, Iran
10.22052/rsm.2024.254297.1049
Abstract
In this research, a study is performed in order to determine the optimal spectral filtration in dual-source imaging system and its effect on increasing the mean energy and energy separation between high and low energy spectra .X-ray spectrum is simulated using Monte carlo Fluka 2011 simulation code. X-ray tube with tungsten anode and 1.6 mm aluminum inherent filter was designed. Then, an additional filter was applied to the 140 keV tube and the low-energy spectrum was left unchanged to prevent further reductions in the output .In the next step,in order to minimizing the overlaps among the spectra, former filter was implemented and mean energy difrrences was investigated. Filter’s materials have selected from several elements in which, Tin and bronze are practical options. Based on our results, tin filter with a thickness of 0.5 mm has increased the average energy difference from 17.8 to 40.6 keV. In the second evaluation, using bronze filter on high and Eribium on the low energy tube, the average energy difference was increased from 17.8 to 45.87 keV.In our evaluation The overlap of low and high energy spectra have been decreased significantly.In addition to examine the sensitivity of different materials, the difrences in dual energy ratio has been compared. The larger the difference is, the contrast between two materials has increased .This increase in dual energy ratio is expected to improve the performance of dual-source CT scans in increasing contrast and improving image quality and dose reduction.
Keywords
filter
dual source CT
X-ray quality
overlap
spectrum separation
Monte Carlo simulation
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