问题 问答题 简答题

计算机体层成像注意事项。

答案

参考答案:

1.CT检查费用较高,常规X线检查不能诊断时才可选用。诊断已经明确者无须再做CT检查。

2.对神志不清、烦躁不安和不合作的病人,应予以镇静,以保证CT扫描的图像质量。

3.为了提高病变的检出率,或确定病变的性质,有时候需做静脉注射含碘对比剂以增强显影效果,因此扫描前应做好碘剂过敏试验。

4.腹部CT扫描前宜禁食3~4小时,并口服1%对比剂300~500mL以充盈显示肠曲。盆腔扫描需使膀胱充胀。

5.提供病人以往的影像检查资料,以供扫描定位及诊断时参考。

完形填空
完形填空。
                                          How 3D Movies Work   .
     Do you know 3D movies? When you see one, it's like the story  l  in front of  you, and you are a  part ofit. 3D movies are  exciting to   2   , but do you
know how3      them, and      4   you need to wear a pair of  3D  glasses? To
understand these  questions, let's make an easy   5  .
     O Put a finger   6   your eyes.
     O Cover your lef't eye and look at the finger.
     O Cover your right eye and look at the finger.
     What do you see:l The finger you see with your left eye is in a different
position from the one you see with your right eye. This means you get two
images(图像) when you look at   7     _ with both your eyes. To makea 3D
movie, people have to get two images at the same time,   8_ they use two
video cameras.  When playing a  3D movie, they use two projectors (放机)  
at the same time.  This brings two images together on the screen. Then, we
use 3D glasses to separate(识别) the two images. One image enters one eye
and   9 enters the other eye.
     Then our brains   10      the two images together. In this way, we get 3D
pictures.
( )1. A. happen      
( )2. A. watch        
( )3. A. make        
( )4. A. when        
( )5. A. examl)le    
( )6. A. in front of  
( )7. A. everything  
( )8. A. because      
( )9. A. other        
( )10.A. let          
B. happened     
B. see            
B. to make        
B. why            
B, picture        
B. in the front of
B. anything        
B. so              
B. the other      
B. put            
C. to happen  
C. look        
C. making      
C. which      
C. experiment  
C. behind      
C. something  
C. and        
C. others      
C. take        
D. happening  
D. notice    
D. made      
D. what .    
D. mowe      
D. beside    
D. nothing    
D. but        
D. the others
D. bring      
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