Background: The thyroid is among the more radiosensitive organs in the body. The goal of this study was twofold: (1) to evaluate age-related changes in what is exposed to ionizing radiation in the neck area, and (2) to assess thyroid shield presence in cephalometric radiographs Methods: Cephalometric radiographs at one academic setting were sampled and neck exposure was related to calendar year and patient's gender and age. Results: In the absence of shields, children have more vertebrae exposed than adults (p < 0.0001) and females have more neck tissue exposed inferior to the hyoid bone than males (p < 0.0001). The hyoid bone-porion distance increased with age (p <0.01). Thyroid shields were visible in 19% of the radiographs and depended strongly on the calendar year during which patient was seen (p-value <0.0001). Compared to adults, children were less likely to wear thyroid shields, particularly between 1973 and 1990 (1.8% versus 7.3% - p-value < 0.05) and between 2001 and 2003 (7.1 % versus 42.9% - p-value < 0.05). Conclusion: In the absence of a thyroid shield, children have more neck structure exposed to radiation than adults. In agreement with other reports, thyroid shield utilization in this study was low, particularly in children. © 2006 Hujoel et al; licensee BioMed Central Ltd.
CITATION STYLE
Hujoel, P., Hollender, L., Bollen, A. M., Young, J. D., Cunha-Cruz, J., McGee, M., & Grosso, A. (2006). Thyroid shields and neck exposures in cephalometric radiography. BMC Medical Imaging, 6. https://doi.org/10.1186/1471-2342-6-6
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