Hamid Ghaznavi - Department of Radiology, Faculty of Paramedical Sciences, Kurdistan University of Medical Sciences, Sanandaj, Iran
Zeinab Momeni - Department of Medical Physics and Engineering , Isfahan University of Medical Sciences, Isfahan, Iran
Sadegh Ghaderi - Department of Neurosciences and Addiction Studies, School of Advanced Technologies in Medicine Tehran University of Medical Sciences, Tehran, Iran

Background: Computed tomography (CT) is vastly applied in X-ray procedures because of its high quality in detecting the anatomical structures of the body. However, it leads to an increase in patient dose, resulting in carcinogenesis. In the head and neck CT, the thyroid is the most important at-risk organ. The aim of this study was to estimate thyroid cancer risk in cervical CT with and without a bismuth shield.Materials and Methods: After obtaining permission from the authors, data related to the thyroid dose of patients undergoing cervical CT in the study by Santos et al (۲۰۱۹) were used, and then thyroid cancer risk was calculated for different ages at exposure in male and female patients using the biological effects of the ionizing radiation (BEIR) VII model.Results: Using bismuth shielding reduced thyroid dose by ۳۷% and ۳۹% in male and female phantoms, respectively. Thyroid cancer estimation demonstrated that the risk was nearly two-fold in females compared to males. Finally, bismuth shielding reduced ۴۰% of cancer risk, and it decreased in both genders by increasing age at exposure.Conclusion: According to our findings, excess relative risk (ERR) up to ۰.۰۶% was associated with cervical CT. Although ERR amounts were low, the effect of radiation on thyroid cancer risk should not be neglected. Accordingly, it is suggested that future trials use bismuth shielding to reduce thyroid cancer risk.

Thyroid cancer risk, Cervical CT, Bismuth shielding, BEIR VII model