Assessment of Thyroid Cancer Risk After Cervical Computed Tomography: The Impact of Bismuth Shielding

سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 111

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شناسه ملی سند علمی:

JR_IEJM-10-2_006

تاریخ نمایه سازی: 28 آذر 1400

چکیده مقاله:

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.

نویسندگان

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