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Physics 2 > Test 1 > Flashcards

Test 1 Flashcards

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1
Q

________ is performed by gain control

A

Compensation

Via the amplifier

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2
Q

Where is the harmonic signal created

A

Tissue

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3
Q

Which of the function is most needed to compensate for attenuation in tissue

A

Amplification

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4
Q

When adjusting the power output control, which component affected?

A

Pulser

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5
Q

Which component of the instrument will be involved in determining the amplitude of the voltages sent to each element

A

Beam former

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6
Q

What determines the limit on the number of transmission channels

A

The number of elements in the transducer

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7
Q

Functions of the beam former (3)

A

Generating voltages
Determining PRF
compensating for attenuation

NOT filtering the signals from the echoes

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8
Q

T/F the pulser provides the voltage that drive the pulse within the transducer

A

True

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9
Q

T/f you can adjust the PRF in greyscale

A

False

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10
Q

Process of making small signals larger

A

Amplification

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11
Q

What would most likely occur if the PRF did not change as the sonographer increased depth

A

Echo misplacement

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12
Q

Voltage frequency is measured in what unit

A

MHz

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13
Q

What parameter is affected by the output dial?

A

Intensity of the beam

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14
Q

For a 4Mhz transducer how much does the TGC amplify for an object 5cm away ?

A

20 dB

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15
Q

What info is sent from the summer to signal professor

A

Sends digital values of echoes corresponding voltages

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16
Q

What function is most affected by the echo delays?

A

Reception focus/ steering

17
Q

Coded excitation involves sending multiple pulses through the tissue and stacking their echoes. Explain what this allows for (5) and any disadvantages (1)

A 
Benefits
Multiple foci
Spatial compounding 
Increase penetration 
Increase contrast resolution
B flow imaging can pickup very slow flow

Disadvantages
A higher ensemble length decreases frame rate

18
Q

What component of the beam former controls phasing?

A

Pulse delays

19
Q

What component of the US machine will be damaged without the use of a TR switch

A

Amplifiers

20
Q

If the area of focus does not change, how will increasing the amplitude of the pulser voltage 2x affect the intensity of the sound beam?

A

It increases 4x

21
Q

If the far field of an image is too dark, it is recommended that you

A

Increase the receiver gain

Physics 2 (2 decks)

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