問題一覧
1
which of the following best describes the relationship between the frequency and period of a waveform in soft tissue?
frequency increases = period decreases
2
what type of interference occurs when in-phase waves combine to form a wave with an amplitude larger than each individual wave?
constructive
3
which type of interference results when out-of-phase waves combine to form a wave with an amplitude smaller than each wave?
destructive interference
4
how long is the wavelength of a 1 MHz ultrasound probe when scanning a soft tissue structure?
1.54mm
5
what term is used to describe the rate at which energy is consumed or work is carried out?
power
6
what term is used to describe the phenomenon when two ultrasound waves encounter each other and result in a disturbance of the wave pattern?
interference
7
which type of pulse is typically utilized to attain increased imaging depth in ultrasound?
longer-duration pulses
8
if continuous and pulsed waves have equal spatial peak temporal peak (SPTP) intensities, which of the best describes the spatial peak temporal aversion (SPTA) intensity?
SPTA intensity is higher in continuous waves.
9
what is the minimum frequency of sound that is considered to be part of the ultrasound range?
20,000Hz
10
what is the term used to describe the number of pulses transmitted by an ultrasound transducer per unit time?
pulse repetition frequency
11
which of the following best describes the speed of sound in soft tissue?
a characteristic of the medium
12
which of the following is expressed as mass divided by volume?
density
13
which mathematical term is used to describe a number that, when multiplied by another number, results in a product of one?
reciprocal
14
what is the frequency range that is typically associated with infrasound?
0-20 hz
15
which of the following is expressed in hertz (Hz) and signifies one complete cycle per second?
frequency
16
which is the most commonly used to measure frequency in ultrasound imaging?
Hertz (Hz)
17
what is the formula for calculating the wavelength in ultrasound imaging?
propagation speed / frequency
18
if the distance between the transducer and reflector is doubled, what happens to the sound beam’s intensity?
quartered
19
which of the following produces better axial resolution and improved overall image quality?
short spatial pulse length
20
in ultrasound imaging, what unit measures the frequency of oscillations , indicating the number of complete vibration cycles occurring in one second?
Hertz (Hz)
21
which of the following is determined by the medium and is not affected by the frequency or wavelength of the sound?
propagation speed
22
which of the following statements accurately describes a characteristic of power Doppler imaging?
power Doppler is more sensitive to lower Doppler shifts than normal color- flow Doppler and is not angle -dependent
23
what is used to measure a substance’s resistance to compression?
bulk modulus
24
how much would the power of a sound wave increases if it’s amplitude were doubled?
4x
25
which of the following statements accurately describes a sonographer’s ability to control the intensity of an ultrasound beam?
sonographers have the ability to manually adjust the intensity of an ultrasound beam.
26
an ultrasound wave initially has an amplitude of 2.5 units. Due to a sudden change in conditions, it’s amplitude increases to 5.0 units. How does this change affect the amount of energy carried by the ultrasound wave?
it increases by a factor of four
27
what term refers to the measurement of the distance from the baseline to the peak of an ultrasound wave?
amplitude
28
in a ultrasonics wave traveling through soft tissue, the particles vibrate in the same direction as the wave’s movement. what is the most accurate way to characterize this type of wave?
mechanical and longitudinal
29
what change could a sonographer make to improve visualization of deeper structures during an ultrasound exam?
decrease frequency
30
what is the average propagation speed of sound in soft tissue?
1,540 m/s
31
which primary parameters are included in the acoustic variables that help identify a sound wave?
pressure, Density, distance
32
which component is primarily responsible for determining the frequency, imputing power, intensity, and other properties of an ultrasound wave?
sound source
33
which of the following statements accurately describes the characteristics of low frequency transducers?
greater depth of penetration but lower spatial resolution
34
m-mode in echocardiography displays the movement of the myocardium allowing for accurate and real-time measurements of wall thickness, which axis is used to display time?
x-axis
35
which of the following best describes how much resistance an ultrasound beam encounters as it passes through a medium?
acoustic impedance
36
what type of mechanical wave propagates along or through a medium by particle-to-particle interaction?
sound
37
a sonographer is performing an ultrasound exam with a transducer that emits a sound wave with an initial amplitude of 1 mm. if the sonographer made an adjustment so that the amplitude of the triples, which of the following will increase by a factor of 9?
power
38
if the power of a beam increases by a factor of the 3 and the area remains unchanged, what will happen to the intensity of the beam?
the intensity will increase by a factor of 3
39
in a medium where the frequency of a sound wave remains constant, how is the wavelength of a sound wave related to the speed of sound?
directly proportional
40
in a periodic wave, if the frequency increases, which of the following parameters would decrease in response?
wavelength
41
what term represents the measure of power per unit area?
intensity
42
which of the following is determined by the medium and the source?
spatial pulse length
43
all of the following statements describe the Reynolds’s number except?
it indicates the speed of sound in a medium
44
which of the following statements accurately describes a sonographer’s ability to adjust the power of an ultrasound beam during imaging?
sonographers have the ability to manually adjust the power of an ultrasound beam during imaging?
45
how does the wavelength of ultrasound waves relate to their frequency, particularly when comparing low- frequency and high -frequency waves?
longer wavelength in low-frequency waves
46
what is the typical unit of measurement for intensity?
watts/cm^2
47
what is the range of frequencies that can typically be heard by humans?
20-20,000 Hz
48
when describing sound sound waves, what are the seven parameters that are used to quantify their properties?
period, frequency, amplitude, power, intensity, wavelength, and propagation speed
49
when sound travels from a medium with a different speed of sound to another medium, which of the following changes?
wavelength
50
what is the standard unit of measurement for the power of a sound wave in ultrasound imaging?
watts
51
which of the following parameters determines the power of an ultrasound wave?
sound source
52
What is the technical term used to define the duration of time between the beginning of one ultrasound pulse and the beginning of the next pulse?
pulse repetition period
53
in B-mode images, which axis is used to display the depth of a reflector?
x-axis
54
arrange the following mediums in order from fastest to slowest, based on the rate at which sound travels through them: air , bone, fat , lung, soft tissue, tendon
bone> tendon> soft tissue > fat > lung > air
55
all of the following are assumptions a commercial medical ultrasound machine makes when converting the returning echoes into a diagnostic image, EXCEPT?
there is gas everywhere along the path of the beam
56
Ultrasound pulses consist of cycles of acoustic energy emitted by the transducer, interrupted by gaps of silence. Which of the following statements best describes the relationship between frequency and depth of penetration in ultrasound transmission?
increasing frequency decreases the depth of penetration
57
which of the following parameters are used in pulsed wave ultrasound imaging?
pulse duration, spatial pulse length, pulse repetition period, pulse repetition frequency, duty factor
58
what is displayed along the y-axis in a-mode ultrasound?
amplitude
59
what are the two parameters that determine the length of time a pulse is active and the distance it covers in one cycle in ultrasound imaging, respectively?
pulse duration and spatial pulse length
60
a sonographer is performing an ultrasound exam and is having difficulty imaging a superficial structure due to poor resolution. which of the following changes would be most likely to improve the ability to image shallow depths and provide better resolution?
increase frequency
61
which of the follow is directly proportional to the intensity of a sound wave?
amplitude
62
which parameter is primarily influenced by the properties of the medium through which the sound waves propagate?
propagation speed
63
when an ultrasound wave is created, which of the following determines its period?
sound source
64
what are the qualities that describe the loudness or strength of a sound wave?
amplitude, power, intensity
65
how does the speed of sound traveling through a medium change as the stiffness of the medium increases?
increases
66
which of the following terms is defined as the amount of force per unit area?
pressure
67
which type of wave propagates in a direction perpendicular to the disturbance of the medium
transverse wave
68
what term is used to describe the duration of time required for one full cycle of vibration to pass through a specific point?
period
69
what is the term used to describe the area of high pressure and density in a sound wave as it travels through a medium?
compression
70
what are the qualities that describe the loudness or strength of a sound wave?
Amplitude, power, intensity
71
if the amplitude of a sound wave is increased by a factor of two, and all other factors remain constant, what will happen to the intensity of the sound wave?
4x greater
72
which unit is commonly used to express the density of a material, defined as the amount of mass per unit volume?
kilogram per cube meter
73
how long is the wavelength of a 2 MHz ultrasound probe when scanning a soft tissue structure?
0.77mm
74
which of the following is a medium through which sound waves propagate?
air
75
what is the term for distance travel by an ultrasound pulse during its transmission through a medium?
spatial pulse length
76
Which of the following emits ultrasound pulses continuously with a duty factor of 100%
continuous wave transducer
77
which of the following is defined as the time interval during which the ultrasound transducer emits an ultrasound pulse in ultrasound imaging?
pulse duration
78
in which region of a sound wave traveling through a medium is the pressure and density lower?
rarefaction
79
what is the name of the measurement in ultrasound imaging that is calculated as the difference between the highest and Lowest points of a sound wave in a given waveform?
peak to peak amplitude
80
what parameter determines the frequency of ultrasound waves?
the sound source itself
81
what is the typical range of ultrasound transducer frequencies?
2 to 20 MHz
82
what measurements are needed to determine the wavelength of an ultrasound wave as it propagates through a medium?
speed of sound in the medium and transducer frequency
83
if the sonographer increases the depth of the image to visualize the deeper structure, what happened to the frequency of the ultrasound wave?
the frequency of the ultrasound wave remains unchanged
84
what term best describes the influence tissue has on a sound wave traveling through it?
acoustic propagation properties
85
which of the following represents one of the fundamental assumptions in the design of ultrasound imaging systems?
the sound waves only travels in a straight line
86
what is the SI unit of pressure which is used in ultrasound?
pascal
87
which of the following is a limitation of spatial compounding?
decreased frame rate
88
which type of pulses are typically used for shallow imaging depths in ultrasound?
shorter -duration pulses
89
which of the following is inversely related to period?
frequency
90
which term is used to describe the effect of sound waves on biological tissue that can be measured?
bioeffects
91
What is the term used to describe the fraction or percentage of time during which an ultrasound transducer is actively transmitting pulses?
duty factor
92
What parameters should the operator adjust to affect the pulse repetition frequency in an ultrasound examination?
imaging depth
93
what happens to the speed of sound in a medium if the density of the medium increases?
decreases