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Ultrasound Physics > Study Test Chp 13&14 Us Physics > Flashcards

Study Test Chp 13&14 Us Physics Flashcards

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1
Q

What is the first function of the receiver of amplification uniform called?

A. Overall gain
B. Receiver gain
C. TGC
D. PRF

A

A. Receiver gain

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2
Q

Image that is uniformly bright from top to bottom is called.

A. Amplification
B. Reject
C. Demodulation
D. Compensation

A

D. Compensation

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3
Q

What is the role of preamplification within the transducer

A. Degrades weak signals
B. Improve weak signals
C. Signals stay the same
D. It has nothing to do with signals

A

B. Improve weak signals

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4
Q

Which has the shallowness delay

A. 3Mhz
B. 12Mhz
C. 5Mhz

A

B. 12Mhz

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5
Q

Which has the deepest delay

A.3Mhz
B. 12Mhz
C. 5Mhz

A

A. 3Mhz

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6
Q

Is alara the best way to image deeper
True or false

A

True

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7
Q

Alara increases or decreases the frequency

A

Decrease

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8
Q

Which is affecting factor to frame rate
A. Speed of sound in medium
B. Imaging depth
C. # of pulses per frame
D. Line density

A

A. Speed of sound in medium

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9
Q

If temporal resolution improves what happens to frame rate
A. Decrease
B. Increases
C. Stay the same
D. Has nothing to do with it

A

B. Increases

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10
Q

A sonographer adjusted an us machine to change the sector size for 90 degrees to 45 degrees. Nothing else changes what happens to the frame rate.

A. Halved
B. Double
C. Tripled
D. Remains unchanged

A

B. Doubled

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11
Q

A sonographer adjusting an ultrasound system changed the sector size from 90° to 45°.The frame rate was unchanged.What else must have happened

A. Sector size doubled
B. Line density was doubled
C. Imaging depth was halved
D. Temporal resolution was halved

A

B. Line density was doubled

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12
Q

If you change a multi focus to a single focus, what happens to the temporal resolution

A. Degrades
B. Increases
C. Decrease
D. Improves

A

D. Improves

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13
Q

The lines go from 1 to 3, this will cause temporal resolution degrade
True or false

A

True

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14
Q

Frequency has an effect on temporal resolution
True of false

A

False

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15
Q

What is the frame rate if each image of the ultrasound system is created in 0.02secs (1/50 sec)
A. 20hz
B. 100hz
C. 50hz
D. 15hz

A

C. 50hz

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16
Q

A sonographer adjusted in ultrasound scan to double the depth of view from 5 cm to 10 cm. What happens to the frame rate
A. Unchanged
B. Doubles
C. Halved

A

C. Halved

17
Q

The critical factor in determining frame rate, line density, and image depth is the transducer style
True or false

A

False, it’s time

18
Q

The number of lines per frame and frame rate determines the frequency
True of false

A

False, it’s PRF

19
Q

What is the fundamental limitation of temporal resolution
A. Imaging depth
B. Speed of sound in the medium
C. Line density
D. Sector size

A

B. Speed of sound in the medium

20
Q

What is alara used for
A. Patients help
B. Location of patient
C. Patients care
D. Patients safety

A

D. Patients safety

21
Q

Which of the following is the most important in determining the frame rate of a system.
A. Depth of view
B. Dynamic range of the receiver
C. Transducer frequency
D. Transmitter output

A

A. Depth of view

22
Q

High line density has a negative effect on temporal resolution. What happens to the temporal resolution
A. Increases
B. Improve
C. Degrades
D. Decrease

A

C. Degrades

23
Q

When there is a shallow image, what type of frame rate is there

A. Low frame rate
B. Long frame rate
C. Short frame rate
D. High frame rate

A

D. Higher frame rate

24
Q

Alara maximizes the patients us exposer
True or false

A

False, it minimizes it

25
Q

What happens to the output power to cause an improvement to the signal to noise ratio
A. Shorten
B. Longer
C. Decrease
D. Increases

A

D. Increases

26
Q

The acoustic power of a sound beam emitted from a transducer is determined by the _____ of the pullers signal
A. PRF
B. Frequency
C. Voltage
D. Rectification

A

C. Voltage

27
Q

List the 5 receiver operations
1.
2.
3.
4.
5.

A
  1. Amplification
  2. Compensation
  3. Compression
  4. Demodulation
  5. Reject

Ultrasound Physics (3 decks)

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