问题
名词解释
切面厚度伪像
答案
参考答案：亦称部分容积效应伪像。产生的原因：超声束形状特殊而且波束较宽，即超声断层扫描时断层较厚引起。例如：肝脏深部的小囊肿内可能出现一些点状回声，这些点状回声来自小囊肿旁的部分肝实质；在胆囊也可见这种伪像，有时酷似分层的胆泥。
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切面厚度伪像
参考答案：亦称部分容积效应伪像。产生的原因：超声束形状特殊而且波束较宽，即超声断层扫描时断层较厚引起。例如：肝脏深部的小囊肿内可能出现一些点状回声，这些点状回声来自小囊肿旁的部分肝实质；在胆囊也可见这种伪像，有时酷似分层的胆泥。
| 请你仔细阅读下面短文，帮助Dr. Ma整理好他的案例。 | |||||||||||||
| Mr. Ma, a famous mental (心理的) doctor from Beijing once said at an important meeting, "Now many young students can have problems with their minds. Some students become worried because they have to study very hard. Others have trouble getting on well with people around them like their parents and classmates. Parents and teachers should care more about this problem." Then Mr. Ma gave some examples. One patient, Li Yun a middle school students from Xi'an was doing badly in his lessons. He thought his teachers and friends often laughed at him, and he became so nervous and worried that one night he left his homes without telling parents. Another student, Dai Yi, a 14-year-old schoolgirl from Shanghai, was very afraid of exams. While she was reading the exam paper, she couldn't think of anything to write. So she was worried and unhappy. At last even she wanted to kill herself A recent report from Jiefang Daily says about 18% of the young students in Shanghai have mental problems. They often fell worried and very unhappy. Unluckily many of them won't go and ask for help. Some think they will look stupid(not clever) if they go to see a doctor. Others won't talk about their secrets. At the end of the meeting, Mr. Ma offered some good ideas to young people: ● Talk to your parents or teacher often. ● Take part in group activities. ● Try to get on well with the people around you. ● Go to see a doctor if you often feel unhappy. | |||||||||||||
Case of Young Students
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