编辑同志:我孩子今年15岁。一个多月前,他在学校上夜自习课时突发头痛,到镇卫生院看,作了脑CT检查,结果正常。过了几天又到市医院检查,作脑CT仍正常。后来听说脑CT电离辐射对人体危害很大,尤其是青少年儿童。我问孩子有什么感觉,他说在市医院作脑CT时可能是辐射太大,感觉头痛,浑身好像有啥东西在动。请问孩子在6天内做了两次脑CT有什么害处?会不会影 Editor’s Comrade: My child is 15 years old this year. More than a month ago, he had a headache at school during his private study class in the night and went to the town hospital for a brain CT examination. The result was normal. After a few days went to the city hospital for brain CT is still normal. Later I heard brain CT ionizing radiation on the human body is very harmful, especially young children. I asked my child what it was like to feel that he said that in the city hospital brain CT may be too much radiation, feeling a headache, whole body seems to have something in motion. May I ask the child in 6 days to do twice CT harm? Will not shadow