Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Study on the Measurement of Entrance Surface Dose to the Thyroid and Both Eyes in Dental Panoramic Radiography

치과 파노라마촬영에서의 갑상선과 양쪽 눈의 표면 선량 측정에 대한 연구

  • Jung-Hoon Lee (Department of Radiological Science, Shinhan University)
  • 이정훈 (신한대학교 방사선학과)
  • Received : 2024.10.27
  • Accepted : 2024.11.30
  • Published : 2024.11.30
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Abstract

Panoramic radiography is a technique that captures high-resolution images of the oral and dental areas of a patient, providing comprehensive information about the patient's entire dental condition in a single image. While panoramic radiography uses much less radiation compared to cone-beam CT (CBCT), the issue of patient radiation exposure cannot be overlooked. This study aimed to measure the entrance surface dose of radiation-sensitive tissues, such as the thyroid and eyes, during panoramic radiography, and to calculate the equivalent dose and effective dose from the measured absorbed dose to compare and analyze it with the dose limits. The experiment was conducted using the Rayscan α-OCL (Ray Co., Ltd. Gyeonggi-do, Korea) dental panoramic X-ray system. The phantom used was a head and neck phantom (Model PH-47, Kyoto Kagaku, Japan), which has an attenuation coefficient similar to that of human tissue. During panoramic radiography, the entrance surface dose was measured for radiation-sensitive tissues like the thyroid and lens. The entrance surface dose measured were 31.36 µGy for the thyroid, 25.70 µGy for the left lens, and 25.13 µGy for the right lens, respectively. To verify the differences in radiation doses for each site, a one-way ANOVA was performed, and a significant difference between groups was confirmed. A post-hoc test classified the left and right lenses into the same group, while the thyroid was classified into a different group. From the measured entrance surface dose, the equivalent doses for the left and right lenses were calculated to be 27.50 µSv and 27.13 µSv, respectively. The equivalent dose and effective dose for the thyroid were 31.36 µSv and 1.2544 µSv, respectively.

파노라마 방사선 촬영(panoramic radiography)은 환자의 구강 및 치아 영역을 고해상도 영상으로 촬영하는 기술로, 한 장의 사진으로 환자의 전체 치아 상태에 대한 정보를 제공해 주는 특징을 가진다. 파노라마 방사선 촬영은 Cone beam CT 촬영에 비해 훨씬 적은 양의 방사선이 사용되지만, 환자 피폭에 관련된 사항은 고려하지 않을 수 없다. 본 연구는 파노라마방사선촬영에서 갑상선과 안구와 같은 방사선 감수성이 높은 조직의 입사표면선량을 측정하고, 측정된 흡수선량으로부터 등가 선량과 유효 선량을 구하여 선량한도와 비교 분석해 보고자 하였다. 본 실험은 치과 파노라마 X선 촬영 장비인 Rayscan α-OCL(Ray Co., Ltd. Gyeonggi-do, Korea)을 이용하여 실험을 진행하였다. 사용한 팬텀은 인체조직과 유사한 조직 감쇠계수를 가지고 있는 두경부 인체팬텀(Model PH-47, Kyoto Kagaku, Japan)을 사용하였다. 파노라마방사선촬영 시에 방사선 감수성이 높은 조직인 갑상선과 수정체에서 입사표면선량을 측정하였고, 각각 Thyroid은 평균 31.36 µGy이었고, Lt. Lens은 평균 25.70 µGy, Rt. Lens은 평균 25.13 µGy의 선량 값을 측정할 수 있었다. 각 부위별 입사표면선량에 대한 차이를 확인하고자 one-way ANOVA를 이용하여 분석하였고, 집단 간 유의미한 차이가 있음을 확인할 수 있었다. 또한 사후 검정을 통하여 Lt. Lens와 Rt. Lens는 동일한 집단으로 분류하였고 Thyroid는 다른 집단군으로 분류할 수 있었다. 측정된 입사표면선량으로부터 Lt. Lens와 Rt. Lens의 등가선량은 각각 27.50 µSv, 27.13 µSv이었고, Thyroid의 등가 선량과 유효선량 값이 각각 31.36 µSv, 1.2544 µSv임을 알 수 있었다.

Keywords

References

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