New York University College of Dentistry, United States
Title: Juvenile dosimetry of panoramic and CBCT imaging for visualizing root resorption
Biography: Arthur D Goren and Iryna Branets
Background: No studies have been done to evaluate radiation exposure to a 10 year old juvenile CIRS phantom using OSL dot dosimetry in conjunction with leaded glasses and thyroid shield, utilizing two and three dimensional imaging for orthodontic purposes.
Methods: A juvenile anthropomorphic phantom corresponding to a 10 year old male was used for all exposures. Panoramic radiographs were taken on a Sirona Orthophos XG machine and CBCT scans were taken on a Carestream Kodak 9000 3D machine. The preset pediatric settings were used and with the CBCT, the field of view selected was to image the anterior maxilla, showing the canines and the surrounding area. The images were performed with and without leaded glasses and thyroid shield. Dosimetry was performed using optically stimulated luminescent (OSL) dosimeters. The effective radiation dose was calculated for the organs of the head and neck. Organ fractions irradiated were determined from ICRP-89. Overall effective doses were calculated in micro-Sieverts for the results and were based on the ICRP-103 tissue weighting factors.
Results: The effective doses measured with the panoramic images were significantly less when compared to the CBCT scans. The highest organ dose exposures were in the salivary glands, oral mucosa, and extrathoracic airway. The use of leaded glasses and thyroid shield resulted in a dose reduction of 25% with both the Sirona Orthophos XG and the Kodak 9000 3D machines.
Conclusion: This was the first study to evaluate radiation exposure to a 10 year old juvenile CIRS phantom using OSL dot dosimetry in conjunction with leaded glasses and thyroid shield, using two and three dimensional imaging for orthodontic purposes. Restricting field of view to the anterior maxillary region allows CBCT imaging to be used in specific clinical situations when three dimensional assessment of the presence and severity of root resorption is necessary.