Evaluation of radiation absorption by thyroid gland and eye lens in trophy panoramic radiography

Evaluation of radiation absorption by thyroid gland and eye lens in trophy panoramic radiography Dr.AR. Talaee Pour *- Dr. S. Sahba ** - Dr. M. Maleknia***. *- Associate professor of Oral & Maxillofacial radiology Dept.- Faculty of Dentistry - Tehran University of Medical Sciences. ** - Associate professor of Oral Diseases and Diagnosis.- Faculty of Dentistry - Shaheed Beheshti University of Medical Sciences. *** - Dentist. Background and aim: In dental radiographics, except teeth and adjacent tissues, other neighbouring organs can be exposed to X- ray radiation, bringing about some problems for patients. The goal of the present study was to assess the rate of radiation absorption in thyroid gland and eye lens by trophy panoramic radiograph (Odontorama PC). Materials and Methods: This study was performed on 50 cases (29 males and 21 females), using pocket dosimeter. One dosimeter was stuck on thyroid gland and the other one was stuck parallel to the plane passing through the lenses. A panoramic radiograph was then taken and the numerical amounts were read by two observers and printed on a questionnaire. A comparison was made between the radiation coefficients of thyroid gland and eye lens using t-test and the correlation between these two coefficients was calculated by pearsons' correlation coefficient. Results: The estimated mean amount of radiation absorption was. 41.7 micro gray in thyroid gland and 6.67 micro gray in eye lens. Conclusion: Considering the sensitivity of thyroid gland and eye lens to X-ray radiation, using lead collar shield and apron are suggested. Key Words: Panoramic radiograph - Thyroid gland - Eye lens.