CAJ | 학술논문

目的测量钴、镉、钼合金股骨头人工关节在放疗过程中次级射线引起的散射效应,以及其作为高原子序数材料对剂量分布的影响.方法测量6、10 MV X射线入射方向距关节0.5、1.0、2.0 cm处剂量,出射方向距关节3.0、5.0、7.0 cm处剂量及距关节头部5.0、10.0 cm的剂量曲线.结果 6、10 MV X射线入射方向距关节0.5、1.0、2.0 cm处剂量偏差在0%～5%之间,随能量增加背散射效应更加显著.射线出射方向距关节3.0、5.0、7.0 cm处剂量偏差为21.6%～30.8%,射野和深度相同时随能量增加剂量偏差减少,同一能量和深度下剂量偏差随射野增加而减少.透射剂量曲线显示关节头部对剂量衰减作用极为显著.结论在进行盆腔放疗时尽量避免射野穿过关节,或者至少降低穿越关节的射野权重.
목적 측량고、력、목합금고골두인공관절재방료과정중차급사선인기적산사효응,이급기작위고원자서수재료대제량분포적영향.방법 측량6、10 MV X사선입사방향거관절0.5、1.0、2.0 cm처제량,출사방향거관절3.0、5.0、7.0 cm처제량급거관절두부5.0、10.0 cm적제량곡선.결과 6、10 MV X사선입사방향거관절0.5、1.0、2.0 cm처제량편차재0%～5%지간,수능량증가배산사효응경가현저.사선출사방향거관절3.0、5.0、7.0 cm처제량편차위21.6%～30.8%,사야화심도상동시수능량증가제량편차감소,동일능량화심도하제량편차수사야증가이감소.투사제량곡선현시관절두부대제량쇠감작용겁위현저.결론 재진행분강방료시진량피면사야천과관절,혹자지소강저천월관절적사야권중.
Objective To study the scattering effect of Co-Cr-Mo hip prosthesis which was high Z material for patients undergoing pelvic irradiation.Methods The hip prosthesis was set in water phantom (30 cm×30 cm×30 cm), determing points were chosen on the entrance side of both 6 MV and 10 MV beams at the distance of 0.5 cm, 1.0 cm, 2.0 cm to the hip prosthesis, and also on the exit side of both 6 MV and 10 MV beams at the distance of 3.0 cm, 5.0 cm, 7.0 cm to the hip prostheses.Dose behind the hip prosthesis at depths of 5.0 cm and 10.0 cm for 6 MV and 10 MV beams are also measured.ResultsThe dose deviation on the beams′ entrance side is between 0 to 5.0%, the backscatter effect was more obviously with the higher energy beam.The dose deviation on the beams′ exit side was between 21.6%-30.8%.With the same field size and depth, dose deviation becomes smaller when the beam energy was higher;while with the same energy and depth, dose deviation becomes smaller when the field size was bigger.Dose profiles behind the head of the hip prosthesis indicate obvious attenuation of the beam.Conclusions Beam arrangements that avoid the prosthesis should be considered first or we should at least reduce the weight of the beam that pass through the prosthesis.