|Breast Conservation From Radiation Damage By Using Nano Bismuth Shields In Chest CT Scan|
|Parinaz Mehnati1, Mohammad Yousefi Sooteh1,2, Reza Malekzadeh1, Baharak Divband3,4, Soheila Refahi5|
|1Department of Medical Physics, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
2Student Research Committee, Tabriz University of Medical Sciences, Tabriz, East Azerbaijan, Iran
3Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
4Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
5Department of Medical Physics, Faculty of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
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Keywords : Nano Bismuth, shields, Dose reduction, chest CT, Image quality
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Objectives: The goal of this study was to calculate the efficiency of bismuth nanoparticles shield to protect the breast in chest CT scan and investigate the alteration of image quality after using shield.
Materials and Methods: This study is an experimental research including three groups. Group 1, phantom was scanned without using Nano bismuth shield. Group 2, using 0.5 mm Nano bismuth shield and group 3, Nano bismuth shield with 1 mm thickness was used. The PMMA (Poly Methyl Meth Acrylate) phantom was used for presenting the main organ of chest including breast and lung. Multi detector 6-slice CT scan system was used for tests. The breast radiation dose was measured by ion-chamber that was placed at 12 o'clock position in the phantom according to dosimetry protocol. Chest CT image processing was performed once without shield and once in the presence of 10% Nano bismuth shield with different thicknesses. Also image quality with adding shield for correct diagnosis was compared. Tests were repeated three time and data analysis was done with ANOVA.
Results: The results have indicated that by using Nano bismuth shields, breast dose reduction was 7.2 % for 0.5 mm and 13.8% for 1mm thickness of the shield. By using Nano-bismuth shields, the CT number increased from 121.3 to 126.36 HU and noise increased from 24.53 to 28.1 HU.
Conclusion: Results presented that Nano bismuth shields have a good potential to reduce the breast dose with the smallest change on the noise. Also by increasing the thickness from 0.5 to 1 mm, the dose reduction ratio almost doubled.
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