Shielding effect of thyroid collar for digital panoramic radiography
1Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology, Beijing, China;
Dento Maxillo Facial Radiology
|September 6, 2013
Summary
Thyroid collars effectively reduce radiation dose in direct digital panoramic radiography. However, they offer minimal additional protection for indirect digital systems, showing limited benefits for the thyroid gland and overall body exposure.
Area of Science:
- Radiological protection in dentistry
- Medical imaging physics
Background:
- Digital panoramic radiography is a common dental imaging technique.
- The thyroid gland is sensitive to radiation, necessitating protective measures.
Purpose of the Study:
- To assess the effectiveness of thyroid collars in reducing radiation dose during digital panoramic radiography.
- To compare the shielding effects across different panoramic imaging systems.
Main Methods:
- Four digital panoramic radiography machines were utilized.
- Thermoluminescent dosemeter chips measured tissue-absorbed doses in an anthropomorphic phantom.
- Effective organ and total effective doses were calculated per International Commission of Radiological Protection guidelines.
Main Results:
- Thyroid collar use reduced effective organ doses, with greater reductions observed for direct digital systems (up to 22.7%).
- Significant dose reductions were noted for specific machines (Orthophos XG Plus, ProMax) with one or two thyroid collars.
- Similar trends were observed for total effective doses across all machines.
Conclusions:
- Thyroid collars are beneficial for direct digital panoramic imaging systems.
- For indirect digital panoramic imaging systems, thyroid collars provide negligible additional protection to the thyroid gland and the whole body.
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