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SPI School Flashcards > SPI Exam Flash Cards Set #3 > Flashcards

SPI Exam Flash Cards Set #3

1
Q

What statement about doppler is not true

A

doppler color has slower velocities that are represented by lighter hues

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2
Q

What happens to the ultrasound beam beyond the critical angle

A

100% reflected

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3
Q

The range equation relates

A

distance, velocity and time

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4
Q

What type of transducer is composed of multiple ring shaped elements

A

annular

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5
Q

Without interpolation, what would best describe the resultant Bmode image

A

a series of scan lines with blank data between the lines

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6
Q

If the gain of an amplifier is 18 dB, what will the new gain setting be if the gain setting is reduced by one half

A

15dB

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7
Q

What is the most common result of high integrity ultrasound

A

heat

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8
Q

Lateral resolution is equal to

A

beam diameter

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9
Q

What type of noise arises from small amplitude sound waves that interfere with each other

A

speckle

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10
Q

An individual is supine. The blood pressure generated by the heat is 120 mmHh. What is the hydrostatic pressure at the ankle

A

0mmHg

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11
Q

An individual is standing. The blood pressure generated by the heat is 120mmHg. What is the hydrostatic pressure at the ankle

A

100mmHg

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12
Q

Turbulent flow is most likely to occur in what situation

A

high velocities and acute anemia

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13
Q

The hydrophone is made up of

A

small transducer elements

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14
Q

Lamda symbol represents

A

wavelength

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15
Q

Power is defined as energy per unit

A

time

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16
Q

Rayleigh scattering occurs if the particle dimensions are

A

less than the wavelength

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17
Q

Specular reflection occurs when

A

the reflector surface is large and smooth relative to the wavelength

18
Q

Axial resolution is also known as

A

depth, range, longitudinal, radial

19
Q

What arranges media in terms progagation velocity, from lowest to highest

A

air, fat, muscle, bone

20
Q

The amount of dispersion in the far field of an ultrasound beam can be decreased by

A

using a larger diameter transducer

21
Q

If the number of cycles in a pulse is increased but the wavelength remains the same, what is true

A

the pulse duration is increased

22
Q

The near zone length of a transducer depends on

A

frequency and transducer diameter

23
Q

The type of compressional wave in which the particles move back and forth parallel to the direction of wave propagation is know as

A

longitudinal wave

24
Q

The interpreting physician has asked you to use a stand off pad to evaluate a superficial mass. What is the main advantage the stand off provides to improve the image

A

increases distance between the transducer and the mass, making it more likely that the mass will be located close to the elevational focus of the sound beam

25
Q

What best describes a vector array transducer

A

electronic steering, electronic focusing, trapezoidal shaped image

26
Q

What best describes the empirical approach to the study of bioeffects

A

exposure-response

27
Q

What ultrasound method requires two active elements mounted side by side

A

CW doppler

28
Q

Changes in the doppler shift frequency within a color flow image sample site appear in the image as

A

different colors (hues) or different levels of saturation (purity)

29
Q

Dynamic focusing

A

is made possible by array based systems

30
Q

A 7.5 MHz transducer is used on a patient with the ultrasound wave propagatinf warious tissues listed below. What will have the shortest wavelength

A

lungs

31
Q

What type of resolution degraded in the presence of grating lobes and side lobes

A

lateral

32
Q

Adjusting the overall gain will increase or decrease the brightness of the image due to

A

amplification of the receiver voltage

33
Q

The image on an ultrasound system’s display is too bright. What technique is best to correct this problem

A

decrease output power

34
Q

An echo that has undergone an attenuation of 3 dB will have an intensity that is _____ that its initial intensity

A

two times smaller

35
Q

What is an advantage of single crystal or pure wave crystal transducers

A

wide bandwidth

36
Q

The range equation relates

A

distance, velocity, time

37
Q

The reverse piezoelectric effect can be best described as

A

mechanical deformation of ultrasound crystal that results from a high voltage applied across the crystal thickness

38
Q

Frequency is a significant factor in

A

tissue attenuation

39
Q

Increasing the frequency of an ultrasound longitudinal wave will result in what change in the velocity of the wave

A

no change

40
Q

An artifact that would least likely produce a pseudo mass is

A

comet tail artifact

41
Q

Spatial compounding improves the quality of the image in several ways except

A

creating multiple images in a single angle

SPI School Flashcards (5 decks)

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