问题 单项选择题

关于螺旋CT中重建间隔的定义,正确的是()

A.重建时采用的成像算法

B.被重建的相邻两横断面之间长轴方向的距离

C.两层面之间设置的参数

D.与螺旋扫描原始数据有关的螺距

E.相邻两层之间的一种加权参数

答案

参考答案:B

解析:重建间隔(reconstruction interval)和螺距(helical pitch)是螺旋CT扫描技术中两个新的成像参数。重建间隔的定义是被重建的相邻两层横断面之间长轴方向的距离,与常规CT扫描中层间隔的概念不同。因为螺旋CT扫描是容积扫描,对原始数据的回顾性重建可采用任意间隔。

完形填空

李雷不知道该如何提高自己的英语听力水平,于是他在校园BBS上留言求助,有四位同学跟帖回答了他的问题。

LiLei: Hi, everyboby. I’m Jimmy. I like English very much, but I really need some advice on listening . Who can help me?

Jenny:  Don’t get nervous before you start to listen to something. You need to relax. This will help.

Dr.Smith:The first sentence tells a lot the whole passage.for example,if, at the beginning , you hear “Welcome back BBC news---”, you know you will hear a piece of news, not a children’s story, or a science report.

Shirley: When you’re listening, try to do some thinking. For example, you can think of the following questions: What happened? When, Where and how? What was the result (结果)and what did the speaker want to tell us? In this way, you may understand the passage better.

Josh:  It’s important for you to remember some important facts. for example, if the passage is a science report , you should try to remember its results and how the scientists got them.

请根据以上内容完成下面任务:以下A-D是针对上述解答内容的提炼,请将它们分别与对应的解答人配对:

A.listen to important facts.        B.listen carefully to the first sentence.

C.Relax yourself.               D.Think when you’re listening.

小题1:Jenny:       

小题2:Dr.Smith:          

小题3:Shirley:           

小题4:Josh:               

请您也为李雷提供一条提高英语听力水平的建议(一句话):

小题5:                                                           

判断题