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<p>This study evaluates the efficacy of a bismuth oxide/silicone rubber (Bi<sub>2</sub>O<sub>3</sub>/SR) composite thyroid collar in reducing radiation doses to the eye lens and larynx during periapical (PA) and orthopantomogram (OPG) dental imaging. Using a head-neck section of an adult male Rando phantom equipped with GR-200 thermoluminescent dosimeters (TLDs), measurements were conducted at standard exposure settings (PA: 60&#xa0;kV/7&#xa0;mA/0.32&#xa0;s; OPG: 75&#xa0;kV/13&#xa0;mA/14.1&#xa0;s). Results demonstrated that the composite shield significantly reduced larynx doses by 23.5% (PA) and 97% (OPG) compared to unshielded conditions, outperforming a commercial lead shield (0.5&#xa0;mm Pb equivalent) in OPG procedures. For the eye lens, the composite shield achieved a 57.6% dose reduction in OPG imaging, though it showed no significant protection in PA radiography, possibly due to scattering effects. The findings highlight the superior shielding performance of Bi<sub>2</sub>O<sub>3</sub>/SR composite thyroid collar in OPG, offering a promising lead-free alternative for minimizing radiation exposure to sensitive tissues in dental radiology.</p>

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Dose assessment in eye lens and larynx for periapical and OPG imaging using a bismuth based thyroid collar and Rando phantom

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Shahryar Malekie,
  • Leila Shahbazi,
  • Sedigheh Kashian,
  • Dariush Sardari,
  • Mohsen Kheradmand Saadi,
  • Peiman Rezaeian,
  • Amir Moslehi,
  • Nahid Hajiloo,
  • Ruhollah Adeli,
  • Seyed Rashid Hosseini Aghdam,
  • Mahmoudreza Akbari,
  • Farhood Ziaie

摘要

This study evaluates the efficacy of a bismuth oxide/silicone rubber (Bi2O3/SR) composite thyroid collar in reducing radiation doses to the eye lens and larynx during periapical (PA) and orthopantomogram (OPG) dental imaging. Using a head-neck section of an adult male Rando phantom equipped with GR-200 thermoluminescent dosimeters (TLDs), measurements were conducted at standard exposure settings (PA: 60 kV/7 mA/0.32 s; OPG: 75 kV/13 mA/14.1 s). Results demonstrated that the composite shield significantly reduced larynx doses by 23.5% (PA) and 97% (OPG) compared to unshielded conditions, outperforming a commercial lead shield (0.5 mm Pb equivalent) in OPG procedures. For the eye lens, the composite shield achieved a 57.6% dose reduction in OPG imaging, though it showed no significant protection in PA radiography, possibly due to scattering effects. The findings highlight the superior shielding performance of Bi2O3/SR composite thyroid collar in OPG, offering a promising lead-free alternative for minimizing radiation exposure to sensitive tissues in dental radiology.