Abstract
파노라마방사선촬영 시 방사선감수성이 높은 갑상선의 방사선 피폭을 최소화하면서 진단에 유용한 영상을 얻기 위하여 조직등가물질인 보루스(bolus)를 차폐체로 사용하여 피폭선량 감소효과를 측정하였다. 실험은 2011. 6. 1일부터 6. 30일까지 두경부팬톰을 이용하여 갑상선 위치의 표면입사선량과 심부흡수선량을 측정하였다. 그 결과 갑상선 부위 입사표면선량은 평균 43.84 <TEX>${\mu}Gy$</TEX>이었고, 10 mm 두께의 보루스로 만든 갑상선보호대에서는 평균 28.39 <TEX>${\mu}Gy$</TEX>로 15.45 <TEX>${\mu}Gy$</TEX>(35.24%)가 감소되었다. 20 mm 갑상선보호대를 착용했을 경우에는 평균 25.38 <TEX>${\mu}Gy$</TEX>로 미착용 시 평균 43.84 <TEX>${\mu}Gy$</TEX>보다 18.46 <TEX>${\mu}Gy$</TEX>(42.10%)가 감소되었다. 그리고 표면에서 20 mm 깊이에서는 10 mm 두께의 갑상선보호대는 선량 감소효과가 없었고, 20 mm 갑상선보호대를 착용했을 경우에는 0.06 mSv (20%)의 선량감소효과가 있었다. Exposure-dose reducing effect was measured by using bolus, a tissue-equivalent material as a shield to obtain useful diagnostic images while minimizing the radiation exposure of thyroid which is highly sensitive to radiation during panoramic radiography. The experiment was performed within the period of 1 June 2001 through 30 June 2011 by measuring entrance surface dose and deep dose at the thyroid-corresponding site of a head and neck phantom. As a result, the entrance surface dose in the thyroid for using no shield was 43.84 <TEX>${\mu}Gy$</TEX> on the average, and the thyroid shield of bolus 10 mm in thickness reduced the dose by 15.45 <TEX>${\mu}Gy$</TEX>(35.24%) to 28.39 <TEX>${\mu}Gy$</TEX> on the average. The use of a 20 mm thyroid shield resulted in the dose of 25.38 <TEX>${\mu}Gy$</TEX> on the average, a 18.46 <TEX>${\mu}Gy$</TEX>(42.10%) drop from 43.84 <TEX>${\mu}Gy$</TEX> for using no shield. On the site 20 mm below the surface, a thyroid shield 10 mm in thickness had no dose-reducing effect, while a 20 mm thyroid shield reduced the dose by 0.06 mSv(20%).
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