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用深度剂量陡落的电子束治疗脑部肿瘤比传统光子束更具优势,用多野电子束则优势更明显。楔形野方能使剂量分布均匀,与光子不同的是,电子束在其射束上加材料均导致其能量的严重衰减,并增加其散射。作者对调强电子束楔形野多野照射与传统的光子束多野照射的剂量分布做对照研究。 作者在MM50型调强加速器上对笔束扫描式10～25MeV电子束进行辐射脉冲分配,增加射野内的局部剂量,形成所需的楔形剂量分布,用胶片法在
Treatment of brain tumors with deep-eyed steams is more advantageous than traditional photon beams, and the advantage of using more-field electron beams is more pronounced. Wedge-shaped field can make the dose distribution, and photon is different, the electron beam in its beam plus materials are caused by its serious energy attenuation, and increase their scattering. The authors compared the intensity distribution of electron beam wedge field multi-field irradiation and traditional multi-field photon beam irradiation dose control study. The authors performed a radiation pulse distribution of a beam-scanning 10-25 MeV electron beam on a MM50-type intensity-modulated accelerator to increase the local dose in the field to form the desired wedge dosage distribution,