فهرست نشریات علمی دسترسی آزاد ایران

Background: Application of nanomaterial has recently been introduced as a novel method to make a radiation shield to protect biological damage. Objectives: The purpose of this study was to evaluate the effectiveness regarding the use of nano-shield on the protection of the breast in chest computed tomography (CT) scan. Results: Nano-bismuth shields reduced the dose value by 9% and 15% in the skin layer related to 10% and 15% bismuth nanoparticles ratio (0.5 mm thickness), respectively. Also, by increasing shield thickness to 1 mm, the dose of skin layer was reduced by 18% and 24% related to 10% and 15% of bismuth nanoparticles ratio, respectively. Analysis of CT image showed a 10% increase in the noise related to the 10% bismuth shield. Conclusion: The nano-bismuth composite shield with different ratios and thicknesses show significant dose reduction in the breast. This could play a role in breast cancer prevention during chest CT scan.