Ultrasound Physics Quizes 1 - 5

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  • 1/85 Questions

    Which of the following correctly represents distance and time?

    • A. Inches per mile
    • B. meters per second
    • C. feet per yard
    • D. milliters per liter
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About This Quiz

Ultrasound is the term given to sound waves with frequencies higher than the upper audible limit of human hearing. Since humans can’t hear these sounds, their frequencies are generally looked at through images instead. What do you know about them?

Ultrasound Physics Quizzes & Trivia

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  • 2. 

    How are your exam scores related to your study time?

    • A. Directly related or proportional to

    • B. Inversely related

    • C. Unrelated

    Correct Answer
    A. A. Directly related or proportional to
    Explanation
    The correct answer is A. Directly related or proportional to. This means that there is a positive correlation between exam scores and study time. The more time a person spends studying, the higher their exam scores are likely to be.

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  • 3. 

    Which of the following is a unit of area?

    • A. Miles

    • B. Millimeters

    • C. Centimeters squared

    • D. Yards

    Correct Answer
    A. C. Centimeters squared
    Explanation
    Centimeters squared is a unit of area because it represents the measurement of a two-dimensional space. It is obtained by multiplying the length of an object by its width, both measured in centimeters. This unit is commonly used to measure the area of small objects or surfaces. Miles, millimeters, and yards are units of length and do not represent area.

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  • 4. 

    As sound travels through the body, what happens to the intensity of the wave?

    • A. increases

    • B. decreases

    Correct Answer
    A. B. decreases
    Explanation
    As sound travels through the body, the intensity of the wave decreases. This is because sound waves encounter resistance and are absorbed or reflected by the various tissues and organs in the body. As the wave travels further, it loses energy and therefore its intensity decreases. Additionally, some of the sound energy is converted into other forms of energy, such as heat, further contributing to the decrease in intensity.

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  • 5. 

    Which of the following is the reciprocal of a billion?

    • A. thousand

    • B. 0.001

    • C. 0.000000001

    • D. 0.00001

    Correct Answer
    A. C. 0.000000001
    Explanation
    The reciprocal of a number is obtained by dividing 1 by that number. In this case, the reciprocal of a billion would be 1 divided by a billion, which is equal to 0.000000001.

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  • 6. 

    Which of the following units is associated with Duty Factor?

    • A. microseconds

    • B. Hz

    • C. millimeters

    • D. %

    Correct Answer
    A. D. %
    Explanation
    Duty Factor is a dimensionless quantity that represents the ratio of the pulse duration to the total period of a pulse waveform. It is commonly expressed as a percentage. A higher duty factor indicates that the pulse is on for a greater proportion of the total period, while a lower duty factor indicates that the pulse is on for a smaller proportion of the total period. Therefore, the correct unit associated with Duty Factor is % (percentage).

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  • 7. 

    If two waves exist at the same location with the peaks and troughs in sync. and combine, this is known as?

    • A. Compression

    • B. Rarefaction

    • C. Destructive interaction

    • D. Constructive interference

    • E. Inerferon

    Correct Answer
    A. D. Constructive interference
    Explanation
    When two waves exist at the same location with their peaks and troughs in sync, they combine to create a new wave with a larger amplitude. This phenomenon is known as constructive interference. In constructive interference, the waves reinforce each other, resulting in a wave that has a higher intensity or energy than the individual waves. This can be observed in various situations, such as when two sound waves combine to create a louder sound or when two water waves combine to create a higher wave.

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  • 8. 

    What is the characteristic of acoustic waves with frequencies less than 20Hz?

    • A. Humans chn't hear them

    • B. They travel more rapidly

    • C. They attenuate more in soft tissue

    • D. they are more effective in soft tissue

    Correct Answer
    A. A. Humans chn't hear them
    Explanation
    Acoustic waves with frequencies less than 20Hz are considered infrasound. These low-frequency waves are below the range of human hearing, which typically ranges from 20Hz to 20,000Hz. Therefore, humans cannot perceive or hear these acoustic waves.

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  • 9. 

    Which of the following units is associated with Pulse Repetition Frequency?

    • A. microseconds

    • B. Hz

    • C. millimeters

    • D. %

    Correct Answer
    A. B. Hz
    Explanation
    Pulse Repetition Frequency (PRF) is a measurement used in radar and sonar systems to determine the number of pulses emitted per second. It is measured in Hertz (Hz), which is the unit for frequency. The higher the PRF, the more pulses are transmitted in a given time period, resulting in increased data collection and improved accuracy. Therefore, the correct unit associated with PRF is Hz.

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  • 10. 

    When a sonographer changes the transducer, the system is now changed or altered.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When a sonographer changes the transducer, it means that they are swapping out the device that is used to transmit and receive ultrasound waves. This change in transducer can result in a different frequency or beam shape being used, which can affect the quality and accuracy of the ultrasound images produced. Therefore, it can be said that the system is indeed changed or altered when the transducer is changed.

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  • 11. 

    Based upon the formula, PRP = 1/PRF, if the PRF increases, what happens to the PRP?

    • A. it increases

    • B. it decreases

    • C. It stays the same.

    Correct Answer
    A. B. it decreases
    Explanation
    According to the given formula PRP = 1/PRF, if the PRF (Pulse Repetition Frequency) increases, the PRP (Pulse Repetition Period) decreases. This is because PRP is inversely proportional to PRF, meaning that as PRF increases, the time between each pulse decreases, resulting in a shorter PRP. Therefore, option B, "it decreases," is the correct answer.

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  • 12. 

    The X axis on a graph runs up and down or vertical.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The X axis on a graph runs horizontally, not vertically. The vertical axis on a graph is called the Y axis.

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  • 13. 

    Two waves arrive at the same location and interfere with each other.  Then resultant wave is smaller than the original wave.  What has occurred?

    • A. inphase waves

    • B. destructive interference

    • C. angular interaction

    • D. constructive interference

    Correct Answer
    A. B. destructive interference
    Explanation
    Destructive interference occurs when two waves combine in such a way that they cancel each other out, resulting in a smaller amplitude or intensity compared to the original wave. This happens when the peaks of one wave align with the troughs of the other wave, causing them to interfere destructively.

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  • 14. 

    What unit of measure is used for wavelength?

    • A. mm

    • B. cm squared

    • C. Hz

    • D. Pascal's

    Correct Answer
    A. A. mm
    Explanation
    The unit of measure used for wavelength is millimeters (mm). Wavelength is a measurement of the distance between two corresponding points on a wave, such as the distance between two peaks or two troughs. It is commonly used in the fields of physics and optics to describe the length of electromagnetic waves, sound waves, and other types of waves. The millimeter is a metric unit of length equal to one thousandth of a meter, making it a suitable unit for measuring the relatively small distances associated with wavelengths.

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  • 15. 

    Which of the following units is associated with Pulse Repitition Period?

    • A. microseconds

    • B. Hz

    • C. millimeters

    • D. %

    Correct Answer
    A. A. microseconds
    Explanation
    The correct answer is A. microseconds. Pulse repetition period refers to the time interval between the start of one pulse and the start of the next pulse in a pulse train. It is typically measured in units of time, such as microseconds. The other options, Hz, millimeters, and %, are not directly related to the measurement of pulse repetition period.

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  • 16. 

    Which of the following units is associated with Spatial Pulse Length ?

    • A. microseconds

    • B. Hz

    • C. millimeters

    • D. %

    Correct Answer
    A. C. millimeters
    Explanation
    Spatial pulse length is a measure of the length of an ultrasound pulse in the direction of propagation. It is typically measured in millimeters. This parameter is important in ultrasound imaging as it affects the resolution of the image. A shorter spatial pulse length results in better resolution, allowing for clearer and more detailed images to be obtained. Therefore, the correct answer is C. millimeters.

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  • 17. 

    Which of the following is the lowest intensity?

    • A. SPTA

    • B. SATA

    • C. SPPA

    • D. SPTP

    Correct Answer
    A. B. SATA
    Explanation
    The correct answer is B. SATA. Intensity refers to the power or energy of a sound wave. Among the given options, SATA represents the lowest intensity because it stands for Spatial Average Temporal Average, which represents the average intensity of sound over a defined area and time period. SPTA (Spatial Peak Temporal Average) and SPTP (Spatial Peak Temporal Peak) represent higher intensities as they measure the peak intensity of sound. SPPA (Spatial Peak Pulse Average) is also higher in intensity as it measures the average intensity of sound during a pulse. Therefore, B. SATA is the lowest intensity option.

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  • 18. 

    The intensity of the beam is the same throught the beam.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement "The intensity of the beam is the same throughout the beam" is false. Intensity refers to the amount of energy carried by the beam per unit area. In many cases, the intensity of a beam decreases as it propagates through a medium due to factors like absorption, scattering, and divergence. Therefore, the intensity is not constant and can vary along the beam's path.

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  • 19. 

    What is the range of frequencies emitted by transducers used in diagnostic ultrasound?

    • A. 1 kHz to 10 kHz

    • B. 1 MHz to 7MHz

    • C. -10 kHz to 10 kHz

    • D. 2 MHz to 10 MHz

    Correct Answer
    A. D. 2 MHz to 10 MHz
    Explanation
    Transducers used in diagnostic ultrasound emit frequencies within the range of 2 MHz to 10 MHz. This range is commonly used in medical imaging as it provides a good balance between image resolution and tissue penetration. Frequencies below 2 MHz may provide better tissue penetration but lower resolution, while frequencies above 10 MHz may offer higher resolution but limited tissue penetration. Therefore, the range of 2 MHz to 10 MHz is considered optimal for most diagnostic ultrasound applications.

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  • 20. 

    Which of the following is a unit of volume?

    • A. Feet squared

    • B. Yards

    • C. Cubic inches

    • Millimeters

    • E. Centimeters

    Correct Answer
    A. C. Cubic inches
    Explanation
    Cubic inches is a unit of volume because it measures the amount of space occupied by an object in three dimensions. It is commonly used in engineering and manufacturing industries to measure the volume of small objects or components. Cubic inches are calculated by multiplying the length, width, and height of an object in inches.

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  • 21. 

    What are the units for intensity?

    • A. watts

    • B. watts per cm

    • C. watts per cm squared

    • D. watts per cm cubes

    Correct Answer
    A. C. watts per cm squared
    Explanation
    The correct answer is C. watts per cm squared. Intensity is defined as power per unit area. Therefore, the units for intensity are watts per cm squared, as it represents the amount of power (watts) per unit area (cm squared).

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  • 22. 

    Mathematically, when a number is squared, the number is multiplied by?

    • A. 2

    • B. 0.5

    • C. 1.5

    • D. itself

    Correct Answer
    A. D. itself
    Explanation
    When a number is squared, it is multiplied by itself. This means that the number is multiplied by the number itself to give the squared value. For example, if we square the number 3, we multiply 3 by itself, resulting in 9. Therefore, the correct answer is D. itself.

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  • 23. 

    Wavelength is determined by:

    • A. the source

    • B. the medium

    • C. the source and the medium

    Correct Answer
    A. C. the source and the medium
    Explanation
    The wavelength of a wave is determined by both the source and the medium through which it travels. The source of the wave determines the frequency of the wave, which is the number of complete cycles of the wave that occur in a given time. The medium through which the wave travels affects the speed of the wave, which in turn affects the wavelength. Therefore, both the source and the medium play a role in determining the wavelength of a wave.

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  • 24. 

    Path length does not affect attenuation.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement "Path length does not affect attenuation" is incorrect. Attenuation refers to the decrease in signal strength as it travels through a medium or over a distance. In general, the longer the path length, the greater the attenuation. This is because signals can be absorbed, scattered, or refracted as they travel through a medium, leading to a decrease in their intensity. Therefore, path length does indeed affect attenuation.

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  • 25. 

    Sound travels fastest through tissue that is:

    • A. less dense but more stiff

    • B. less dense but less stiff

    • C. more dense but more stiff

    • D. more dense but less stiff

    Correct Answer
    A. A. less dense but more stiff
    Explanation
    Sound travels fastest through tissue that is less dense but more stiff because the speed of sound is inversely proportional to the density of the medium and directly proportional to the stiffness. In other words, when the tissue is less dense, the sound waves encounter fewer particles to interact with, allowing them to travel faster. Additionally, when the tissue is more stiff, the particles are held tightly together, allowing the sound waves to propagate more quickly. Therefore, a combination of less density and more stiffness allows sound to travel fastest through tissue.

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  • 26. 

    If the tissue does not change but the frequency of the transducer increases, what happens to the wavelength?

    • A. it increases

    • B. it decreases

    • C. it remains unchanged

    Correct Answer
    A. B. it decreases
    Explanation
    When the frequency of the transducer increases and the tissue does not change, the wavelength decreases. This is because wavelength and frequency are inversely proportional to each other. As the frequency increases, the distance between each wave decreases, resulting in a shorter wavelength.

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  • 27. 

    When the sonographer changes the depth of view, which of the following will remain unchanged?

    • A. PRF

    • B. Propagation Speed

    • C. PRP

    • D. duty factor

    Correct Answer
    A. B. Propagation Speed
    Explanation
    When the sonographer changes the depth of view, the propagation speed of the ultrasound waves will remain unchanged. Propagation speed refers to the speed at which the ultrasound waves travel through the medium (such as tissue). It is a characteristic of the medium itself and is not affected by changes in depth. Therefore, regardless of the depth of view, the propagation speed will remain constant.

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  • 28. 

    If power is increased and the area is decreased, what happens to the intensity?

    • A. it increases

    • B. it decreases

    • C. it stays the same

    • D. it cannot be determined

    Correct Answer
    A. A. it increases
    Explanation
    When power is increased and the area is decreased, the intensity increases. Intensity is defined as power per unit area, so when power increases and area decreases, the power is concentrated in a smaller space, resulting in a higher intensity.

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  • 29. 

    In the metric system, which one of the following prefixes matches the correct symbol?

    • A. Megs = m

    • B. milli = n

    • C. deca - D

    • D. centi = c

    Correct Answer
    A. D. centi = c
    Explanation
    The correct answer is D. centi = c. In the metric system, the prefix "centi" is used to represent one hundredth of a unit. The symbol for centi is "c". This is commonly used in measurements such as centimeters (cm) or centigrams (cg), where "centi" indicates a fraction of the base unit.

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  • 30. 

    Which of the following does not contribute to the attenuation process?

    • A. reflection

    • B. propagation speed

    • C. scattering

    • D. absorption

    Correct Answer
    A. B. propagation speed
    Explanation
    Propagation speed refers to the speed at which a wave travels through a medium. It is not directly related to the attenuation process, which is the gradual decrease in the intensity or amplitude of a wave as it travels through a medium. Attenuation is primarily caused by reflection, scattering, and absorption. Therefore, propagation speed does not contribute to the attenuation process.

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  • 31. 

    How are period and frequency related?

    • A. directly

    • B. directly proportional

    • C. inversely

    • D. unrelated

    Correct Answer
    A. C. inversely
    Explanation
    Period and frequency are inversely related. This means that as the period increases, the frequency decreases, and vice versa. The period refers to the time it takes for one complete cycle of a wave or oscillation to occur, while the frequency represents the number of cycles or oscillations that occur in a given time period. Since the period and frequency are reciprocals of each other, they have an inverse relationship.

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  • 32. 

    What is the wavelength of 2 MHz sound in soft tissue?

    • A. 0.77 mm

    • B. 1.54 mm

    • C. 2 mm

    • D. cannot be determined

    Correct Answer
    A. A. 0.77 mm
    Explanation
    The wavelength of a sound wave in a medium is given by the formula λ = v/f, where λ is the wavelength, v is the velocity of sound in the medium, and f is the frequency of the sound wave. In soft tissue, the velocity of sound is approximately 1540 m/s. Therefore, for a 2 MHz sound wave, the wavelength can be calculated as λ = 1540 m/s / 2 × 10^6 Hz = 0.77 mm.

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  • 33. 

    Which of the following units is associated with Pulse Duration?

    • A. microseconds

    • B. Hz

    • C. millimeters

    • D. percent

    Correct Answer
    A. A. microseconds
    Explanation
    Pulse duration is a measure of the time duration of a single pulse. It is typically measured in units of time, such as microseconds. A pulse duration of 1 microsecond means that the pulse lasts for 1 millionth of a second. Therefore, option A, microseconds, is the correct unit associated with pulse duration.

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  • 34. 

    Which one of the following statements is correct?

    • A. There are 10 centimeters in one meter

    • B. .001 second in the same as one nano second

    • C. there are 1000 milliliters in one liter

    • D. There are 100 milliseconds in one second

    Correct Answer
    A. C. there are 1000 milliliters in one liter
    Explanation
    The correct answer is C. There are 1000 milliliters in one liter. This is a conversion between units of volume, where 1 liter is equal to 1000 milliliters.

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  • 35. 

    The thermal index is related to?

    • A. Stable Cavitation

    • B. Tissue heating

    • C. Transient Cavitation

    • D. Attenuation

    Correct Answer
    A. B. Tissue heating
    Explanation
    The thermal index is a measure of the potential for tissue heating during ultrasound imaging or therapy. It provides information about the amount of energy being deposited into the tissue and the potential for any adverse effects such as tissue damage or burns. Therefore, the correct answer is B. Tissue heating.

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  • 36. 

    If power remains the same and area is increased, what happens to the intensity?

    • A. it increases

    • B. it decreases

    • C. it stays the same

    • D. it cannot be determined

    Correct Answer
    A. B. it decreases
    Explanation
    When the area is increased while keeping the power constant, the intensity decreases. This is because intensity is the power per unit area, so when the area increases, the same amount of power is spread out over a larger area, resulting in a decrease in intensity.

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  • 37. 

    What is the highest intensity?

    • A. SPTA

    • B. SATA

    • C. SPTP

    • D. SAPA

    Correct Answer
    A. C. SPTP
    Explanation
    The highest intensity is represented by SPTP. The other options, SPTA, SATA, and SAPA, do not indicate the highest intensity.

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  • 38. 

    What determines the initial amplitude of a sound wave?

    • A. transducer

    • B. medium

    • C. both a and b

    • D. density

    Correct Answer
    A. A. transducer
    Explanation
    The initial amplitude of a sound wave is determined by the transducer. A transducer is a device that converts one form of energy into another, such as converting sound waves into electrical signals. In the context of sound waves, the transducer is responsible for converting the physical vibrations of the medium into an electrical signal, which can then be amplified and heard as sound. Therefore, the transducer plays a crucial role in determining the initial amplitude of a sound wave.

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  • 39. 

    If the area of the beam increases, what happens to the intensity?

    • A. it increases

    • B. It decreases

    • C. It remains the same

    Correct Answer
    A. B. It decreases
    Explanation
    When the area of the beam increases, the intensity decreases. This is because intensity is defined as the amount of power per unit area. So, if the area increases while the power remains constant, the power is spread out over a larger area, resulting in a decrease in intensity.

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  • 40. 

    If power is doubled, what happens to intensity?

    • A. it doubles

    • B. it quadruples

    • C. it is halved

    • D. it is quartered

    Correct Answer
    A. A. it doubles
    Explanation
    When power is doubled, the intensity also doubles. This is because intensity is directly proportional to power. As power increases, more energy is being transferred per unit time, resulting in a higher intensity. Therefore, when power is doubled, the intensity also doubles.

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  • 41. 

    The intensity of an ultrasound beam is defined as  the ___________ in the beam ________ by the _______  of the beam?

    • A. power, multiplied, diameter

    • B. amplitude, multiplied, circumference

    • C. power, divided, diameter

    • D. power, divided area

    Correct Answer
    A. D. power, divided area
    Explanation
    The intensity of an ultrasound beam is defined as the power divided by the area of the beam. This means that the intensity is a measure of how much power is being transmitted through a given area. Therefore, the correct answer is D. power, divided area.

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  • 42. 

    Based upon the SPL formula of SPL = c/f x # of cycles in the pulse, if the frequency increases, what happens to the SPL?

    • A. it increases

    • B. it decreases

    • C. it stays the same

    • D. it can't be affected because you can never change the frequency under any circumstances

    Correct Answer
    A. B. it decreases
    Explanation
    According to the SPL formula, if the frequency increases, the SPL (sound pressure level) decreases. This is because the SPL is inversely proportional to the frequency. As the frequency increases, the number of cycles in the pulse decreases, resulting in a decrease in SPL.

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  • 43. 

    Intensities are important in the study of?

    • A. Tissure heating

    • B. Cavitation

    • C. Biologic effects

    • D. Acoustic effects

    Correct Answer
    A. C. Biologic effects
    Explanation
    Intensities are important in the study of biologic effects because they determine the amount of energy transferred to tissues and cells. Different intensities of ultrasound waves can have varying effects on biological systems, such as promoting tissue healing, stimulating cell growth, or causing damage. By understanding the relationship between intensity and biologic effects, researchers and healthcare professionals can optimize ultrasound treatments for therapeutic purposes while minimizing potential risks.

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  • 44. 

    Which of the following is required for the answer to a numerical question to be comprehensive?

    • A. reciprocals

    • B. units

    • C. numeric values

    Correct Answer
    A. B. units
    Explanation
    To make the answer to a numerical question comprehensive, units are required. Units provide context and clarity to the numerical value, allowing for a better understanding of the answer. Without units, the numerical value alone may not convey the full meaning or significance of the answer. Units help to establish the scale, measurement, or quantity being referred to, ensuring that the answer is complete and meaningful in the given context.

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  • 45. 

    Which of the following is the most sizable component of attenuation?

    • A. scattering

    • B. reflection

    • C. absorption

    • D. refraction

    Correct Answer
    A. C. absorption
    Explanation
    The most sizable component of attenuation is absorption. Attenuation refers to the decrease in intensity or amplitude of a wave as it travels through a medium. In the context of this question, attenuation specifically refers to the decrease in intensity of a wave as it passes through a material. Absorption occurs when the energy of the wave is absorbed by the material, causing a decrease in intensity. Scattering, reflection, and refraction can also contribute to attenuation, but absorption is typically the most significant factor.

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  • 46. 

    Given that there are 2.54 cm in one inch.  You measure the length of the right kidney and it measures 12.7 cm how lond is the right kidney in inches?

    • A. 2.5 inches

    • B. 10 inches

    • C. 7.5 inches

    • D. 5 inches

    Correct Answer
    A. D. 5 inches
    Explanation
    The conversion factor given is that there are 2.54 cm in one inch. To convert from centimeters to inches, we divide the length in centimeters by the conversion factor. In this case, the length of the right kidney is 12.7 cm. Dividing 12.7 cm by 2.54 cm/inch gives us 5 inches. Therefore, the length of the right kidney is 5 inches.

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  • 47. 

    Which intensity is important in the study of bioeffects?

    • A. SPTA

    • B. SATA

    • C. SPPA

    • D. SPTP

    Correct Answer
    A. A. SPTA
    Explanation
    The intensity that is important in the study of bioeffects is SPTA. SPTA stands for Spatial Peak Temporal Average intensity and it is a measure of the average intensity of the ultrasound beam at its peak spatial location over time. This intensity is used to assess the potential biological effects of ultrasound on tissues and is an important parameter in ensuring the safety of ultrasound procedures.

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  • 48. 

    Which of the following pulse reptition frequencies has the shortest pulse repetition period?

    • A. 5,000 Hz

    • B. 12 kHz

    • C. 20 kHz

    • D. 1 kHz

    Correct Answer
    A. C. 20 kHz
    Explanation
    The pulse repetition period is the time between two consecutive pulses in a pulse train. The shorter the pulse repetition period, the higher the pulse repetition frequency. Therefore, the pulse repetition frequency of 20 kHz has the shortest pulse repetition period among the given options.

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  • 49. 

    Based upon the formula, DF = PD/PRP, if the PRP decreases,  what happens to the DF?

    • A. DF increases

    • B. DF decreases

    • C. DF remains the same

    Correct Answer
    A. A. DF increases
    Explanation
    If the PRP (Proportional Reduction of Error) decreases, it means that the error rate is decreasing. According to the formula DF = PD/PRP, if the PRP decreases, the denominator of the fraction decreases. As a result, the value of DF (Discriminant Function) increases.

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  • Jan 21, 2025
    Quiz Edited by
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  • Feb 07, 2012
    Quiz Created by
    Pickles44
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