경추 사방향 검사에서 전후면과 후전면 자세에 따른 갑상선 표면선량 비교
Comparison of the Surface Dose of the Thyroid according to AP versus PA Positioning in Cervical Spine Oblique View
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경추 사방향 검사에서 전후면과 후전면 자세에 따른 갑상선 표면선량을 평가하여 검사 방법의 유용성을 알아보고자하였다. 선량 측정은 Rando phantom을 이용하여 갑상선의 위치인 경추 4∼5번에 선량계를 부착 시켜 측정하였다. 연구 결과, 전후면 사방향 자세와 후전면 사방향 자세의 표면선량 값은 kVp 변화에 따라 각각 595.08±215.01 μGy, 64.21±33.49 μGy이었으며, mAs 변화에 따라 각각 445.20±230.90 μGy, 44.51±22.77 μGy로 나타났다. 후전면 사방향자세는 전후면 사방향 자세에 비해 갑상선이 받는 표면선량을 약 90% 감소시킬 수 있었으며, 각각의 비교에서 통계적으로유의한 차이를 보였다(p<0.001). 따라서 방사선 감수성이 민감한 갑상선이 조사야 내에 포함된 경추검사에서는 환자의표면선량을 줄이는데 후전면 사방향 자세가 유용할 것으로 판단된다.
Abstract
The aim of this study was to evaluate anteroposterior oblique(RPO, LPO) and posteroanterior oblique( LAO, R AO) p rojections o f the cervical s pine, at v arious kVp a nd mA s increments, in o rder to compare thyroid surface dose. Using Rando phantom, dosimeter was attached to the Cervical spine 4∼5 to measure the surface dose in the same thyroid position. As a result, the surface dose was 595.08±215.01 μGy for anteroposterior oblique(RPO, LPO) projections and 64.21±33.49 μGy for posteroanterior oblique(LAO, RAO) projections by changing kVp increment. The surface dose was 445.20±230.90 μGy for anteroposterior oblique( RPO, LPO) projections and 44.51±22.77 μGy for posteroanterior oblique(LAO, RAO) projections by changing mAs increment. The posteroanterior oblique method could reduce about 90% the surface dose than the anteroposterior oblique method. There were statistically significant differences among the examinations( p<0.001). Change the direction of position to reduce the surface dose at oblique projection of cervical spine. Therefore, we consider posteroanterior oblique projections than anteroposterior oblique projections of cervical spine examination in other to reduce patient surface dose.
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