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The influence of different additional filtration assemblies on X-ray tube load and radiation dose
Pages: 526-528
Year: Issue:  5
Journal: Radiologic Practice

Abstract: Objective:The purpose of this study was to investigate the effect of different additional filtering on X-ray tube load and radiation dose in order to select a reasonable assembly that could effectively reduce the radiation and not increase excessive wear of X-ray tube.Methods:A-P radiography of knee joint,lumbar,and chest of self-made molds was performed based on the built-in settings of the diagnostic X-ray source device by adding different filtering assemblies,0Al,2mmAl,0.1 mmCu+ 2mmAl,and 0.2mmCu + 2mmAl with other exposure parameters unchanged.A total of 5 exposures were performed under each assembly.The mAs and DPA value of each exposure were documented for statistical analysis.Results:With the increase of additional filtration thickness the tube load (mAs value) increased by 18.063% ~ 88.385% and the radiation dose (DAP value) reduced by 11.600 % ~ 55.407 %.The results of single factor analysis of variance and pairwise comparison showed that the tube load (mAs value) was 0.2mmCu+ 1mmAl >> 0.1mmCu+ 1mmAl > 2mmAl > 0Al (P < 0.001);the amount of radiation (DAP value) was 0.2mmCu+ 1mmAl< 0.1mmCu+ 1mmAl< 2mmAl (P <0.001).The result of contrast analysis of 0.1mmCu + 1mmAl and 2mmAl indicated that the 0.1mmCu was better than 1mmAl in filter capacity (P < 0.001).Conclusion:Additional filtration must be selected by users in radiography.The assembly of 0.2mmCu + 2mmAl is of the best filtration effect.It can minimize the radiation dose but the wear is also noticeable,which provides as an alternative in practical work.
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