Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Radiation Dose Reduction of Lens by Adjusting Table Height and Magnification Ratio in 3D Cerebral Angiography

삼차원 뇌혈관조영술에서 테이블 높이와 확대율 조절에 따른 수정체 선량 감소에 대한 연구

  • Yoon, Jong-Tae (Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center) ;
  • Lee, Ki-Baek (Department of Radiologic Technology, Chungbuk Health & Science University)
  • 윤종태 (서울아산병원 영상의학과) ;
  • 이기백 (충북보건과학대학 방사선과)
  • Received : 2022.07.21
  • Accepted : 2022.08.13
  • Published : 2022.08.31
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Abstract

Both angiography and interventional procedures accompanied by angiography provide many diagnostic and therapeutic benefits to patients and are rapidly increasing. However, unlike general radiography or computed tomography using the same X-ray, the amount of radiation is quite high, but the dose range can vary considerably for each patient and operator. The high sensitivity of the lens to radiation during cerebral angiography and neurointervention is already well known, and although there are many related studies, it is insufficient to easily reduce radiation in diagnosis and treatment. In this situation, in particular, by adding three-dimensional rotational angiography (3D-RA) to the existing two-dimensional (2D) angiography, it is now possible to make an accurate diagnosis. However, since this 3D-RA acquires images through projection of more radiation than before, the exposure dose of the lens may be higher. Therefore, we tried to analyze whether the radiation dose of the lens can be reduced by moving the lens out of the field range by adjusting the table height and magnification ratio during the examination using 3D-RA. The surface dose was measured using a rando phantom and a radiophotoluminescent glass dosimeter (PLD) and the radiation dose was compared by adjusting the table height and magnification ratio based on the central point. As a result, it was found that the radiation dose of the lens decreased as the table height increased from the central point, that is, as the lens was out of the field of view. In conclusion, in 3D-RA, moving the table position of about 2 cm in height will make a significant contribution to the dose reduction of the lens, and it was confirmed that adjusting the magnification ratio can also reduce the surface dose of the lens.

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References

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