一般中大型X线机管电压的调节范围是() ["A.20~80kV","B.30~90kV","C.60~120kV","D.60~180kV","E.40~150kV"]
患者30岁,述膝关节间歇性隐痛,肿胀半年多,查胫骨上端内侧肿胀,触之有乒乓球感,在X片上胫骨上端内侧呈膨胀性皂泡样骨质破坏,横径大于纵径,诊断为() ["A.骨囊肿","B.动脉瘤样骨囊肿","C.软骨母细胞瘤","D.溶骨型骨肉瘤","E.骨巨细胞瘤"]
试述加速器产生的高能电子束的特点。
下列哪项不是骨肿瘤的基本X线征象() ["A.骨质破坏","B.软骨破坏","C.椎旁脓肿","D.瘤骨和瘤软骨","E.肿瘤的反应骨"]
60钴远距离治疗机有哪些优缺点?
试述137铯中距离治疗机优点。