问题 单项选择题

关于螺旋CT扫描的重建间隔,错误的描述是

A.重建间隔就是常规CT扫描的层间隔
B.重建间隔指重建的相邻两层横断面之间长轴方向的距离
C.螺旋CT可根据需要任意断面重建
D.不管采用什么螺距,对原始数据回顾性重建可采用任意间隔
E.原始数据的内插方式是螺旋CT扫描成像的关键

答案

参考答案:A

解析:螺旋CT扫描的重建间隔不等同于常规CT扫描的层间隔。

阅读理解

阅读理解。

    An old man lived alone in his old house. He hardly ever came out. He wouldn't communicate with others.

    One day, a little boy selling magazines knocked at the man's door. The door slowly opened. "Uh, sir, would

you like to buy a magazine?" The old man just stared (盯着) at the boy. The boy saw lots of dog sculptures

(雕塑品)on the table. "Do you collect dogs?" the boy asked. "Yes, they are all my family." Hearing this, the

boy understood and felt sorry for him." I have a magazine here about dogs. It's perfect for you." The old man

was ready to close the door and said, "No, I don't need any magazines."

    The boy suddenly had an idea. He had a dog sculpture, which did not mean much to him. After a while, the

boy returned with a box. The old man shouted this time,"I told you no magazines!" "I bring you a gift." The

boy opened the box and handed him the sculpture. The man got surprised because no one had given him a gift.

From that day on, the old man started coming out of his house. He and the boy became friends. The boy even

brought his pet dog to visit the old man every week.

根据短文内容,回答下列问题。

1. Did the old man live with his children?

                                                                                            

2. What did the boy sell? 

                                                                                            

3. Where were the old man' dog sculptures?

                                                                                            

4. Why did the old man get surprised when he got the gift?

                                                                                            

5. What do you think of the boy?

                                                                                            

单项选择题