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SPI School Flashcards > SPI Exam Flash Cards Set #1 > Flashcards

SPI Exam Flash Cards Set #1

1
Q

What produces false echoes that are occasionally seen in fluid-filled masses

A

reverberation

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2
Q

______ is always equal to or greater than SPTA

A

SPTP

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3
Q

The binary number 1010 equals the decimal number

A

10

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4
Q

When making circumference measurements using electronic calipers in diagnostic ultrasound, the results are expressed in what type of unit

A

mm or cm

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5
Q

The imaging technique that allows previous hidden structures beneath highly attenuating objects to become visible is called

A

spatial compounding

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6
Q

What is the reflected intensity from a boundary between two materials if the incident intensity is 1 mW/cm^2 and the impedances are 25 and 75

A

0.25 mW/cm^2

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7
Q

What converts doppler shift information into visual analysis

A

FFT

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8
Q

Acoustic clutter and ghosting artifact can be eliminated with

A

wall filter

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9
Q

The near-zone length of a transducer depends on

A

frequency and transducer diameter

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10
Q

What direction is the motion of particles in a longitudinal wave

A

parallel to the axis of wave propagation

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11
Q

Ultrasound wave propagation causes displacement of particles in a medium. What are the regions of lowest particle concentration called

A

rarefactions

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12
Q

What would be most likely to produce a comet tail artifact

A

gas bubble-duodenum interface

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13
Q

What is the most obvious application of C-mode

A

oulsed wave doppler

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14
Q

What is the difference between real-time ultrasound and x ray flouroscopy

A

does not require contrast, no biologic effects, non-ionizing, us cannot travel in a vacuum

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15
Q

What type of cavitation can result in highly localized temperature elevation up to 10,000 degrees Kelvin

A

transient

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16
Q

Attenuation denotes

A

progressive weakening of the sound beam as it propagates through a medium

17
Q

The time gain or depth gain compensation control

A

compensates for attenuation effects

18
Q

A region that is anechoic is diaplyed as

A

echo-free

19
Q

When using the AIUM test object, what should be kept constant for comparisons

A

output power, TGC, reject, transducer, MHz and focus

20
Q

What transducer would be most helpful for imaging superficial structures

A

5 MHz, short-focus

21
Q

Increasing the frequency of an ultrasonic longitudinal wave will result in what changes in the velocity of the wave

A

no change

22
Q

The dynamic range of a pulse-echo ultrasound system is define as

A

the ration of the maximum to the minimum intensity that can be processed

23
Q

Power is defined as energy per unit

A

time

24
Q

Increasing the PRP does what

A

increases the max depth that can be imaged

25
Q

Pulse duration is the _____ for a pulse to occur

A

time

26
Q

Diffraction refers to

A

Spreading out of the beam

27
Q

What frequency is commonly used in the clinical setting

A

7MHz

28
Q

You have increased the transient power while performing a pelvic ultrasound exam. This action increases what

A

penetration, acoustic power, image brightness, voltage applied to the transducer elements

29
Q

The time it takes to complete a single cycle is called

A

period

30
Q

The color-flow image provides information on

A

existence of flow, the location of flow, flow direction in relation to the transducer

31
Q

What terms denotes the technique of dividing normal crystal elements into smaller elements

A

subdicing

32
Q

An example of an acoustic window is

A

liver interface

33
Q

Which of the following sound waves is ultrasonic and least useful in diagnostic imaging: 8,000Hz, 3,000 kHz, 8 MHz, 15 Hz, 30kHz

A

30 kHz

34
Q

What is the nyquist limit if the PRF is 18kHz

A

9kHz

35
Q

Voltage pulses from the pulser to the transducer are also used to

A

synchronize the receiver for the arrival time determination

36
Q

The actual time from the start of the pulse to the end of the pulse is known as

A

pulse duration

37
Q

When using a CW ultrasound, what intensities are equal

A

SATA=SATP

38
Q

The resistance to flow offered by a fluid in motion is called

A

viscosity

SPI School Flashcards (5 decks)

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