问题 单项选择题 A1/A2型题

部分容积效应可以通过下述哪种方法抑制()

A.改变频率编码方向

B.增加平均次数

C.全矩阵采集

D.减少层厚

E.增加FOV

答案

参考答案:D

解析:层面越厚,产生的信号越多,信噪比越高。但是层面越厚,垂直于层面方向的空间分辨率越低,则部分容积效应也大。

阅读理解

阅读理解。

     In foreign (外国的) countries, some people do not like the number 13. They don't think 13 is a lucky

 number. For example, they don't like to live on the thirtieth floor. 

     My friend Jack has got the same idea. He doesn't like the number 13, either.

     One day he asked some friends to dinner. When all of his friends arrived, he asked them to sit around

  the table. He began to count (数) the people in his mind when they were having the delicious food.

 Suddenly (突然) he cried out. "Oh, there are thirteen people here!" Everybody's face turned white except

 (除……以外) Mr. Brown. He said slowly with a smile on his face, "Don't worry, my dear friends! We

 have fourteen people here. My wife Mrs. Brown will have a baby in a few weeks. She is in the family way

 (怀孕) now."

     All of them became happy again.

     "Congratulations!" they said to Mr. and Mrs. Brown. They enjoyed the nice food and had a good time

 that evening.

1. Some people in don't like number 13 because they think number 13 _____.

    A. is a lucky number            

    B. is an unlucky number

    C. can bring them happy          

    D. can make them ill

2. One day Jack asked _____ persons to his home to have dinner. 

    A. 11        

    B. 12          

    C. 13          

    D. 14

3. Suddenly Jack cried out because he found there were _____ people there. 

    A. 11          

    B. 12      

    C. 13              

    D. 14

4. Mrs. Brown will be _____ ina few weeks. 

    A. a mother               

    B. the thirteenth person

    C. Mr. Brown's wife        

    D. Jack's friend

5. Which of the following is NOT right?

    A. When Jack cried out, everyone was afraid(害怕)except Mr. Brown.

    B. In fact, there were fourteen people in Jack's home.

    C. All of them became happy again when they heard Mr. Brown's words.

    D. Many people don't like the number 13, but me friend Jack does.

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