Study guide 14, 15

Question 1

1. Which component organizes in times functions?

Answer 1

Master Synchronizer

Question 2

2. Which component excites the crystal?

Answer 2

Pulser (JL pg 217)

Question 3

3. Choose the area on TGC where attenuation is occurring?

Answer 3

In the region of the slope, compensation corrects for the effects of increasing attenuation

Question 4

4. What creates the pattern for phased array firing?

Answer 4

Beam Former

Question 5

5. Make sure you know the functions of the receiver?

Answer 5

• amplification
• Compensation
• compression
• Demodulation
• Reject- Yes it is adjustable, Only weak signals affected; strong signals remain unchanged, Week echoes appear or are eliminated from image

Question 6

6. Who decides the acoustic power of the sound beam ?

Answer 6

voltage (question 5 pg 237)

Question 7

7. In regards the pulser which form has the electrical signal and sine wave ?

Answer 7

Continuous Wave (JL p236 Q: 2)

Question 8

8. Know what can improve the signal and noise ratio (higher)?

Answer 8

Output power improves or degrades signal and noise ratio

Question 9

9. If an image is to dark or to bright what are your options/what tools may you use to improve the image?

Answer 9

Amplification or output power

Question 10

10. Another receiver question/know about reflector depth which receiver function can change that ?

Answer 10

PRP (pulse repetition period)

Question 11

11. Know about PRP and PRF?

Answer 11

They are inversely related. Shallow imaging- Shorter listening time, shorter PRP, Higher PRF Deep Imaging- Longer listening time, longer PRP, lower PRF

Question 12

12. Know the components about an U/S system

Answer 12

pg 216 Transducer, pulser/beam former, receiver,display,storage,and master synchronizer

Question 13

13. Know which choices to use when you have to much brightness on your image which would be a better choice-

Answer 13

Amplification is the better choice due to bioeffects and ALARA

Question 14

14. Which function effects the strength of every signal?

Answer 14

Compression

Question 15

15. Know the dis advangtes of analog scan converter?

Answer 15

Image fade, Image flicker, Instability, Deterioration

Question 16

16. As well as the advantages of a digital scan converter?

Answer 16

Uniformity, Stability, Durability, Speed, Accuracy

Question 17

17. You need to know what is responsible for the gray scale imaging?

Answer 17

Analog Scan converter

Question 18

18. Questions of shade of gray and bits know how to convert those

Answer 18

2 ^number of bits (JL pg 246)

Question 19

19. Uses old data
Postprocessing
Larger pixel size
Same # of pixels as in the original ROI 
Unchanged spatial resolution 
Unchanged temporal resoltuion

Answer 19

Read (zoom)

Question 20

19. Acquires new data
Preprocessing 
Identical pixel size 
More pixels than in the original ROI 
Improved spatial resolution 
May improve temporal resolution

Answer 20

Write (zoom)

Question 21

20. Know the functions that are Preprocessing

Answer 21

Manipulation of image data before storage in the scan converter. Alters the image data forever and cannot be reversed or undone.

Question 22

20. Function of Postprocessing

Answer 22

Manipulation of image data after storage in the scan converter. The changes can be reversed, Any alteration to a frozen image.

Question 23

Time gain compensation 
Log compression  
Write magnification 
Persistence
Spatial compounding 
Edge enhancement 
Fill-in interpolation

Answer 23

Preprocessing

Question 24

Any change after freeze frame
Black/white inversion 
Read magnification 
Contrast variation 
3-D rendering

Answer 24

Postprocessing

Question 25

Yes it is adjustable, All signals treated identically, Entire image gets brighter or darker

Answer 25

Amplification

Question 26

Yes it is adjustable, Signals treated differently based on reflector depth, Image will be uniformly bright from top to bottom

Answer 26

*Compensation

Question 27

Yes it is adjustable, Signals treated differently depending on strength, Changes gray scale mapping

Answer 27

*compression

Question 28

No it isn’t adjustable, Prepared electrical signals to be suitable for display, No effect on the image

Answer 28

*Demodulation

Question 29

Yes it is adjustable, Only weak signals affected; strong signals remain unchanged, Week echoes appear or are eliminated from image

Answer 29

*Reject