Usefulness of nanoparticles to making shield and protection of sensitive organs in chest CT scan test

Introduction: Recently, the use of nanoparticles has increased for many purpose in medicine. One of these is using the nano particles in shields structure to protect sensitive organs such as breast which placed inside the field of chest CT scan and receives high dose. The aim of this study was the use of nano Bi2O3 to making shield for protection breast in chest CT examination and evaluating their image quality. Method and Materials: The nano Bi2O3 powder was used for create shield at 1mm thickness. The 6-slice CT scan system and PMMA phantom were used for dose measurement. Dose measured once in present of the shield and once in absent of the shield. Also the image quality was measured. Results: Reference average dose was 8.6 mGy in chest CT scan test which changed to 7.4 mGy when Bi2O3 shield was placed on the phantom. Also CT number and noise were raised from 121 HU and 24 to 126 HU and 28. Conclusion: On the base of results, the Bi2O3 nano particles have enough potential for radiation protection and using as a shield for reducing of breast dose in CT scans with acceptable image.