食管囊肿的CT征象中,错误的是() ["A.发生于后纵隔食管走行区,位于食管旁","B.呈圆形或椭圆形,边缘光滑","C.密度均匀,CT值多在10~15HU","D.变换体位扫描可见尖角征","E.增强检查囊壁明显强化"]
支气管囊肿CT值不正确者的是() ["A.黏液性囊肿CT值为30~40HU","B.浆液性囊肿CT值为0~20HU","C.囊肿合并感染或囊内出血CT值为30HU以上","D.内容物为钙乳者CT值在100HU以上","E.内容物为草酸盐结晶者CT值在100HU以下"]
食管异物的预防,下列哪几项是正确的() ["A.进食不宜过于匆忙","B.睡眠前应取下义齿","C.老年人配戴义齿,进食时尤应当心","D.昏迷病人有义齿可以不必取下","E.全身麻醉病人应取下义齿"]
肺转移瘤最常见的CT表现是() ["A.多发结节影","B.粟粒状影","C.小斑片状影","D.蜂窝状影","E.孤立性结节影"]
下列哪几项是植物性气管、支气管异物可能的X线检查所见() ["A.肺不张","B.肺气肿","C.肺部炎性表现","D.可见异物阴影","E.无明显异常"]
物理半衰期()生物半衰期()有效半衰期()