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Physics > Chapter 9, 10 & 11 > Flashcards

Chapter 9, 10 & 11 Flashcards

1
Q

Wider transducer diameter equals ______ focal depth

A

Higher

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2
Q

Smaller transducer diameter equals ______ focal depth

A

Less

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3
Q

High frequency transducer equals_____ focal depth

A

Higher

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4
Q

Low frequency transducers equal ______ focal depth

A

Shorter

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5
Q

High frequency transducers equal _______ divergence

A

Less

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6
Q

Low frequency transducers equal____ divergence

A

More

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7
Q

Higher transducer diameter equals_____ divergence

A

Less

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8
Q

Smaller transducer diameter equals______ divergence

A

More

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9
Q

Axial resolution other names

A

Longitudinal, axial, range, radial, depth (LARRD)

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10
Q

Axial resolution is the ability of the system to display two structures that are______ to the sound beam

A

Parallel

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11
Q

Is axial resolution adjustable?

A

No

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12
Q

Lateral resolution other names

A

Lateral, angular, transverse, azimuthal (LATA)

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13
Q

Lateral resolution is the ability of the system to display two structures that are _____ to the sound beam

A

Perpendicular

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14
Q

B-mode stands for

A

Brightness

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15
Q

A-mode stands for

A

Amplitude

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16
Q

On A-mode the x-axis represents the:

A

Depth

17
Q

On A-mode, the y-axis represents the:

A

Amplitude

18
Q

On B-mode the x-axis represents the

A

Depth

19
Q

Z-axis in b-mode indicates what

A

Different shades of gray

20
Q

On M-mode, the y-axis represents the

A

Depth

21
Q

On m-mode the x-axis represents the

A

Time

22
Q

Far zone is also known as

A

Fraunhofer zone

23
Q

Near zone is also known as

A

Fresnel zone

24
Q

The width of sound beam at the focus is _____ the sound beam as it leaves the transducer

A

Half

25
Q

What are other names for spherical waves

A

Diffraction patterns or
Huygens wavelets

26
Q

The interference of many spherical waves create the shape of the sound beam. What principle explains this

A

Huygens principle

27
Q

Axial resolution improves with

A

Shorter pulses

28
Q

Axial resolution is determined by_______ and remains constant

A

Spatial pulse length

29
Q

Lateral resolution is best with

A

Narrowest beam

30
Q

Lateral resolution changes with

A

Depth

31
Q

Lateral resolution is best at

A

Focus

32
Q

High frequency improves lateral resolution in the far field only, explain why

A

Less divergence

33
Q

Which one is better axial resolution or lateral, and understand why

A

Axial, because the beam is shorter than it is wider

34
Q

What are the three methods of focusing

A

Electronic (phased array), external and internal (fixed)

Physics (20 decks)

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