Post Graduate Student of maxillofacial Radiology department, Dental branch, Islamic Azad University, Tehran. Iran , 30ma.gemini@gmail.com
Abstract: (10917 Views)
Background and aim: protecting the thyroid gland during panoramic radiography with shielding is not recommended. in this study ,the effect of using thyroid protecting shield ( AKTIF EP 316 ) on thyroid dose of patients visiting a private clinic in Tehran in 1392-93 was investigated
Materials and methods: In this clinical trial study 20 men with similar height, weight and age were selected among patients whom prescribed panoramic radiography. The dosimeters ( TLDs) were placed on the front and back side of shield and radiography was performed with similar conditions (MA=10 , KVP=72-76 , 18 s time) using a CRANEX D machine and done for every 10 patients with similar series of dosimeters. Then the TLDs were read and data's were evaluated by Fischer exact test and T- test.
Results: All the images were assessed with the Fischer test , were acceptable and the thyroid protecting shield did not prevent the visualization of the anterior teeth. The absorbed dose of thyroid gland when the dosimeters mounted on the front side of the shield was 0.0353 +- 0.03 mGY, while the absorbed dose was 0.0316+- 0.01 mGY when dosimeters mounted on the backside of the shield .This shows a 10.4 % reduction which is statistically significant based on the T-test (p< 0.002).
Conclusion and recommendations: The use of the thyroid protecting shield has a significant effect on reducing the thyroid gland absorbed dose during panoramic radiography and it’s use is strongly recommended.
Hafezi L, Mohammad Nejad T, Vejdannik S. Protective Effect of thyroid shield (AKTIF EP 316) on the absorbed dose of thyroid gland in panoramic radiography. J Res Dent Sci 2016; 13 (1) :8-13 URL: http://jrds.ir/article-1-720-en.html