Study guide 14, 15 Flashcards Preview

DMSO Physics 2 > Study guide 14, 15 > Flashcards

Flashcards in Study guide 14, 15 Deck (29):
1

1. Which component organizes in times functions?

Master Synchronizer

2

2. Which component excites the crystal?

Pulser (JL pg 217)

3

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

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

4

4. What creates the pattern for phased array firing?

Beam Former

5

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

*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

6

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

voltage (question 5 pg 237)

7

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

Continuous Wave (JL p236 Q: 2)

8

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

Output power improves or degrades signal and noise ratio

9

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

Amplification or output power

10

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

PRP (pulse repetition period)

11

11. Know about PRP and PRF?

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

12

12. Know the components about an U/S system

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

13

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

Amplification is the better choice due to bioeffects and ALARA

14

14. Which function effects the strength of every signal?

Compression

15

15. Know the dis advangtes of analog scan converter?

Image fade, Image flicker, Instability, Deterioration

16

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

Uniformity, Stability, Durability, Speed, Accuracy

17

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

Analog Scan converter

18

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

2 ^number of bits (JL pg 246)

19

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

Read (zoom)

20

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

Write (zoom)

21

20. Know the functions that are Preprocessing

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

22

20. Function of Postprocessing

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

23

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

Preprocessing

24

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

Postprocessing

25

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

Amplification

26

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

*Compensation

27

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

*compression

28

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

*Demodulation

29

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

*Reject