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DMSO Physics 2 > Study guide 14, 15 > Flashcards

Study guide 14, 15 Flashcards

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1
Q
  1. Which component organizes in times functions?
A

Master Synchronizer

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2
Q
  1. Which component excites the crystal?
A

Pulser (JL pg 217)

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

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

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4
Q
  1. What creates the pattern for phased array firing?
A

Beam Former

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5
Q
  1. Make sure you know the functions of the receiver?
A
  • 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
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6
Q
  1. Who decides the acoustic power of the sound beam ?
A

voltage (question 5 pg 237)

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

Continuous Wave (JL p236 Q: 2)

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

Output power improves or degrades signal and noise ratio

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

Amplification or output power

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

PRP (pulse repetition period)

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11
Q
  1. Know about PRP and PRF?
A

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

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12
Q
  1. Know the components about an U/S system
A

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

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

Amplification is the better choice due to bioeffects and ALARA

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14
Q
  1. Which function effects the strength of every signal?
A

Compression

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15
Q
  1. Know the dis advangtes of analog scan converter?
A

Image fade, Image flicker, Instability, Deterioration

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

Uniformity, Stability, Durability, Speed, Accuracy

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

Analog Scan converter

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

2 ^number of bits (JL pg 246)

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

Read (zoom)

20
Q 
19. Acquires new data
Preprocessing 
Identical pixel size 
More pixels than in the original ROI 
Improved spatial resolution 
May improve temporal resolution
A

Write (zoom)

21
Q
  1. Know the functions that are Preprocessing
A

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

22
Q
  1. Function of Postprocessing
A

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

23
Q 
Time gain compensation 
Log compression  
Write magnification 
Persistence
Spatial compounding 
Edge enhancement 
Fill-in interpolation
A

Preprocessing

24
Q 
Any change after freeze frame
Black/white inversion 
Read magnification 
Contrast variation 
3-D rendering
A

Postprocessing

25
Q

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

A

Amplification

26
Q

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

A

*Compensation

27
Q

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

A

*compression

28
Q

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

A

*Demodulation

29
Q

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

A

*Reject

DMSO Physics 2 (26 decks)

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