Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Feasibility Study of Modifying Diagnostic Radiation Dose using Magnetic Field

자기장을 이용한 진단방사선 선량 변화 가능성 연구

  • Jeong-Min Seo (Department of Radiological Science, Catholic University of Pusan)
  • 서정민 (부산가톨릭대학교 방사선학과)
  • Received : 2024.10.07
  • Accepted : 2024.10.31
  • Published : 2024.10.31
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Abstract

This study investigated the feasibility of applying the changes in electron dose distribution, observed in high-energy therapeutic radiation using magnetic fields, to low-energy diagnostic radiation. The diagnostic X-ray exposure conditions were set with a tube current of 200 mA, source-to-detector distance (SDD) of 100 cm, exposure time of 1.0 sec, and an irradiation field size of 20 × 20 cm2. The tube voltage was varied from 70 to 100 kVp in 10 kVp increments. A 0.5 T permanent Nd magnet was used to create a magnetic field below the collimator. Measurements were repeated 20 times for each tube voltage, both with and without the magnetic field, and were compared using an independent-samples t-test. While slight differences of dose were observed at tube voltages of 70, 80, and 90 kVp, no statistically significant differences were found (p > .05). However, a significant difference was observed at 100 kVp (p = .048). Based on these findings, it is suggested that applying higher energy, longer exposure times, stronger magnetic fields, and high-performance detectors could potentially modify the electron dose distribution in diagnostic radiation. This could contribute to dose reduction for patients and improvement in the quality of medical imaging.

본 연구에서는 고에너지 치료용 방사선에서 확인된 자기장을 이용한 전자선량 분포의 변화를 저에너지진단용 방사선에서 적용할 수 있는 가능성을 확인하였다. 진단용 엑스선 조사 조건은 관전류 200 mA, SDD 100 cm, 조사시간 1.0 sec, 조사면 크기 20 × 20 cm2, 관전압은 70에서 100 kVp까지 10 kVp 간격으로 조사하였다. 자기장은 0.5 T 영구자석을 이용하여 콜리메이터 아래에 형성하였다. 자기장이 없는 조건과 자기장을 인가한 조건에서 각 관전압별로 20회 반복 측정하였으며 독립표본 t 검정을 통하여 비교하였다. 관전압 70, 80, 90 kVp에서 미세한 선량 차이가 보이나 통계적으로 유의한 차이는 나타나지 않았으며(p>.05), 관전압 100 kVp에서 차이가 나타남을 확인하였다(p=.048). 이러한 결과를 통하여 본 연구에서 적용한 조건보다 높은 에너지와 긴 조사시간, 그리고 강한 자기장을 적용하고, 고성능의 검출기를 사용한다면 진단용 방사선의 사용에서 선량전달에 기여하는 전자선의 선량을 변화시켜, 피검자에 대한 선량과 의료영상의 질적 향상에 적용이 가능할 것으로 사료된다.

Keywords

Acknowledgement

본 연구는 2023년 부산가톨릭대학교 대학혁신지원사업 지원으로 수행되었음

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