Publication: Assessment of absorbed dose to the eye's lens during dental cbct with different acquisition protocols
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Date
2025-07
Authors
Zumzuri, Nur Aimi Fatihah Md
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Abstract
Dental cone-beam computed tomography (CBCT) is widely recognised as a valuable imaging modality in modern dentistry, offering high-resolution, three-dimensional images with relatively lower radiation exposure compared to conventional CT. Despite its advantages, CBCT still poses radiation risks to radiosensitive organs, particularly the eye lens, which has been linked to an increased risk of radiation-induced cataracts. This study was conducted to evaluate the absorbed dose to the eye lens during dental CBCT procedures using TLD-100 thermoluminescent dosimeters (TLDs), and to examine how variations in scanning parameters influence dose levels. A 3D anthropomorphic head phantom was employed to replicate a human, with TLDs was positioned at the specific locations of both eye lenses. The phantom was scanned using different CBCT exposure protocols, varying in field of view (FOV), tube voltage (kVp), and tube current (mA). The results demonstrated that absorbed dose to the eye lens was influenced by both FOV and mA settings. At a fixed FOV (medium size) and 8 mA, an increase in kVp from 60 to 90 resulted in increased eye lens dose from 0.778 mGy to 1.563 mGy. Conversely, when mA was varied from 3.2 to 16 mA at 60 kVp, the dose ranged from 0.420 mGy to 4.412 mGy. Additionally, under a constant 90 kVp setting, increasing FOV from XS to XL produced mean eye lens doses ranging from 2.148 mGy to 3.093 mGy. The use of TLD-100 dosimeters proved reliable in dose measurement, reinforcing the importance of accurate dosimetry for patient protection. This study underscores the need for optimised scanning protocols and consideration of energy correction factors to reduce unnecessary radiation exposure. Implementing dose-reduction strategies and increasing awareness among dental professionals can ensuring patients safety, particularly in procedures requiring repeated imaging.
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Keywords
Dental CBCT , eye lens dose