Head CT 검사 시 안구 차폐용 Bismuth사용에 의한 수정체 선량 감소에 대한 평가
Assessment of the Eye Lens Dose Reduction by Bismuth Shields in Rando Phantom Undergoing CT of the Head
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본 연구는 두부 전산화 단층촬영 시 차폐용 bismuth를 사용하여 수정체 선량의 감소와 차폐용 bismuth의 유용성을 평가하기 위해 수행되었다. 인체모형 팬텀과 열형광 선량계를 이용하여 (a) 안구를 포함한 두부 CT촬영 (b) 두부 전체가 포함된 CT촬영 (c) 안구를 배제하고 20°를 준 두부 CT촬영 시의 수정체 선량을 평가하였다. 수정체 선량의 감소효과는 안구를 포함한 두부 CT촬영에서 43.2%, 두부 전체가 포함된 CT촬영에서 36.0%, 20° 각도를 준 두부 CT촬영에서 1.4%로 나타나 두부 전체가 포함된 CT촬영과 안구를 포함한 두부 CT촬영에서는 상당한 감소효과가 있지만 안구를 제외한 20° 각도를 준 두부촬영에서는 감소효과가 적었다. 즉, 차폐용 bismuth를 사용한 수정체 선량감소는 안구가 촬영부위에 포함된 경우에는 유의한 것으로 나타났으나 안구가 포함되지 않은 두부 CT촬영일 경우에는 유의하지 않은 것으로 나타났다. 따라서 두부 CT촬영 시 차폐용 bismuth의 사용은 안구가 포함되는 일부의 CT촬영에서만 제한적으로 사용되는 것이 바람직하다.
Abstract
The aim of this study is to assess the dose reduction of eye lens and availability of bismuth garments resulting from the use of radioprotective bismuth garments to shield the eyes of patients undergoing head CT. Rando phantom and TLDs were used to determine the amount of dose reduction by bismuth shielding of the eye in the following simulated CT scans: (a) scanning of the head including orbits, (b) scanning of the whole head, and (c) 20° angled scanning of the head excluding orbits. The average dose reduction of eye lens was 43.2%, 36.0% and 1.4% for the three CT scans listed above. Significant reduction in the eye lens dose was achieved by using superficial orbital bismuth shielding during head CT scans. However, bismuth shields should not be used for the patients when their eyes are excluded from the primarily exposed region.
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