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practice exam Flashcards

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1
Q

Which transducers fires the elements in groups?

A

linear sequenced array

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2
Q

What is the highest attenuator in U/S?

A

air

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3
Q

What has the highest prop velocity?

A

bone

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4
Q

What is the intensity equation?

A

Power/area

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5
Q

Which of the following has the lowest intensity?

a. SPTP
b. SATP
c. SPTA
d. SATA

A

SATA

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6
Q

What is the definition of the beam uniformity ratio?

A

SP/SA

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7
Q

Ultrasound attenuates an average of ___________________dB/cm of
travel for each megahertz of frequency.

A

0.7

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8
Q

If medium 2 impedance is equal to medium 1 impedance:

A

100% transmission

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9
Q

What is the measurement for impedance?

A

Raylz

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10
Q
  1. A decibel (dB) describes the:
    a. Ratio of two sound intensities
    b. Sum of two sound intensities
    c. Amount of scattering
    d. Velocity of the sound wave
A

Ratio of 2 sound intensities

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11
Q

The attenuation coefficient of sound in soft tissue can be defined by what equation?

A

freq/2

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12
Q

Diffraction refers to

A

spreading out of the beam

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13
Q

The echoes are stored before final display by the:

A

Scan converter

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14
Q

What component of the ultrasound system contains the digital-to analog converter?

A

Scan converter

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15
Q

How many different shades of gray can the human eye discern at one
time?

A

about 100

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16
Q

The spatial resolution capabilities of the system are mainly functions of the:

A

tx

17
Q

What is infrasound?

A

sound with a frequency less than 20 Hz

18
Q

What is audible sound?

A

s in the frequency range of 20 to 20,000 Hz

19
Q

How dp you adjust the PRF?

A

by adjusting the depth

20
Q

When is angle 2 less than angle 1

A

if speed of medium 2 is less than the speed of angle 1

21
Q

What is propogation speed determined by?

A

Propagation speed is only determined by the medium (specifically stiffness and density

22
Q

Unit for intensity

A

W/cm2 i

23
Q

What testing device is used to measure acoustic output (intensity)
level?

A

hydrophone

24
Q

radial resolution is another name for?

A

axial resolution

25
Q

Axial resolution formula

A

1/2 SPL

26
Q

In the most common type of transducers, the slice-thickness plane is focused by using?

A

a lens

27
Q

What is the relationship of propogation speed and frequency?

A

unrelated, dont alter eachother

28
Q

Which law describes the relationship between flow and the pressure
differential, viscosity, and length?

A

Poisuelles

29
Q

M/C flow in the body

A

Laminar

Physics (12 decks)

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