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X선촬영시 연부조직두께에 따른 선량분포에 관한 연구

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 (A) study on the distribution of X-ray according to the thickness of soft tissue in radiography 
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[한글] 인체에 방사선이 조사됐을때 특히 연부조직에서 X선관전압과 조사부위의 두께 그리고 조사면적의 크기에 따른 선량분포에 관한 실험결과 다음과 갈은 결과를 얻었다. 1. X선관전압(Kvp)에 따른 총투파선량(IP + Is)은 50 Kvp에서 5.01 mR, 90 Kvp에서 35.81 mR으로 관전압 증가에 따라서 총투과선량은 뚜렷하게 증가하였다 (P<0.001). 2. X선관전압(Kvp)에 따른 산란선 함유율은 50 Kvp에서 71.30%, 90 Kvp에서는 68.25%로 통계학적으로 유의한 차이가 없었다(P= 0.889). 3. 산란선 함유율에 관계된 요인으로 조사부위의 두께, 조사면적의 크기 그리고 1차선량으로 89.14%를 설명할 수 있었다 (P<0.01). 4. 각도별 선량분포는 1차선 진행방향(0°)과 후방(160°)의 산란선량이 가장 많았고 측방(80°) 산란은 적었다(P<0.01). 5. 거리의 증가에 따라서 산란선량의 분포는 뚜렷하게 감소되었다(P<0.001). 본 연구를 통하여 산란선함유율은 주로 조사부위의 두께와 조사면적에 의해 영향을 받고 있음을 알 수 있었고, 전방향(0°)과 후방향(160°) 산란선량이 모두 크기때문에 소홀하기 쉬운 후방산란선의 차폐수단이 이용되어야 하며 특히 특수촬영시에 환자에게 X선이 조사될때는 멀리 있는 방법도 불필요한 방사선 피폭을 감소시키는 한 방법이 된다는 결론을 얻었다.
[영문] When X-rays were projected into a patient, there occured the phenomena such as penetration, absorption and scattering etc. The penetrating raya were recorded on films as X-ray image used for diagnosis but scattered rays caused the radiation hazard both to the patient, specialist and technicians. The soft tissue includes many organs which are sensitive to the radiation and in may occupy 40-50% of body weight. Therefore X-raya should be carefully projected to the patient and it is strongly recommended to analyse the distribution of X-rays, when ever the patient is exposed to X-rays. In this study, the distributio of X-ray according to the thickness, the radiation field and the tube voltages (Kvp) in soft tissue, the following results were obtained: 1. Total transmitted rays which kept the step with X-ray tube voltage (Kvp) increased in proportion to the increasing of X-ray tube voltage. 2. The scattered ray rate in the total transmitted ray was not significantly found with X-ray tube voltage. 3. The affecting factors of the scattered ray rate in total transmitted ray were shown through the radiation field and the thickness. 4. The dose of scattered ray by the angle was observed more in direction of primary ray (O°) and back scattering (160°) than in direction of 90°. The more the distance from phantom to the patient should be less distribution of scattered ray.
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