OBJECTIVES: The purpose of the study is to evaluate the effectiveness of thyroid shielding in dental CBCT examinations using a paediatric anthropomorphic phantom. METHODS: An ATOM(®) 706-C anthropomorphic phantom (Computerized Imaging Reference Systems Inc., Norfolk, VA) representing a 10-year-old child was loaded with six thermoluminescent dosemeters positioned at the level of the thyroid gland. Absorbed doses to the thyroid were measured for five commercially available thyroid shields using a large field of view (FOV). RESULTS: A statistically significant thyroid gland dose reduction was found using thyroid shielding for paediatric CBCT examinations for a large FOV. In addition, a statistically significant difference in thyroid gland doses was found depending on the position of the thyroid gland. There was little difference in the effectiveness of thyroid shielding when using a lead vs a lead-equivalent thyroid shield. Similar dose reduction was found using 0.25- and 0.50-mm lead-equivalent thyroid shields. CONCLUSIONS: Thyroid shields are to be recommended when undertaking large FOV CBCT examinations on young patients.
OBJECTIVES: The purpose of the study is to evaluate the effectiveness of thyroid shielding in dental CBCT examinations using a paediatric anthropomorphic phantom. METHODS: An ATOM(®) 706-C anthropomorphic phantom (Computerized Imaging Reference Systems Inc., Norfolk, VA) representing a 10-year-old child was loaded with six thermoluminescent dosemeters positioned at the level of the thyroid gland. Absorbed doses to the thyroid were measured for five commercially available thyroid shields using a large field of view (FOV). RESULTS: A statistically significant thyroid gland dose reduction was found using thyroid shielding for paediatric CBCT examinations for a large FOV. In addition, a statistically significant difference in thyroid gland doses was found depending on the position of the thyroid gland. There was little difference in the effectiveness of thyroid shielding when using a lead vs a lead-equivalent thyroid shield. Similar dose reduction was found using 0.25- and 0.50-mm lead-equivalent thyroid shields. CONCLUSIONS: Thyroid shields are to be recommended when undertaking large FOV CBCT examinations on young patients.
Authors: M Loubele; R Bogaerts; E Van Dijck; R Pauwels; S Vanheusden; P Suetens; G Marchal; G Sanderink; R Jacobs Journal: Eur J Radiol Date: 2008-07-18 Impact factor: 3.528
Authors: R K Marwaha; N Tandon; Ganie M Ashraf; S K Ganguly; A Batra; R Aggarwal; Kalaivani Mani; S Singh Journal: Natl Med J India Date: 2008 Mar-Apr Impact factor: 0.537