Comprehensive SPI Practice Test

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About This Quiz

The 'Comprehensive SPI Practice Test' assesses knowledge of ultrasound (US) physics, focusing on sound waves, US speed in soft tissue, frequency limits, acoustic variables, and propagation properties. Ideal for those preparing for medical physics or radiology certifications.

Comprehensive SPI Practice Test - Quiz

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  • 2. 

    Sound waves carry energy

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Sound waves carry energy because they are mechanical waves that propagate through a medium by transferring energy from one particle to another. As sound waves travel, they cause the particles in the medium to vibrate, and this vibration transfers energy in the form of kinetic energy from particle to particle. This energy can then be detected and perceived as sound by our ears. Therefore, it is true that sound waves carry energy.

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  • 3. 

    Sound waves are

    • Electric

    • Mechanical transverse

    • Spectral

    • Longitudinal mechanical

    Correct Answer
    A. Longitudinal mechanical
    Explanation
    Sound waves are longitudinal mechanical waves. Longitudinal waves are characterized by the particles of the medium vibrating parallel to the direction of wave propagation. In the case of sound waves, the particles of the medium (such as air molecules) vibrate back and forth in the same direction as the wave travels. This vibration of particles creates areas of compression and rarefaction, which result in the propagation of sound energy through the medium. Therefore, sound waves are longitudinal in nature and require a medium (such as air, water, or solids) to propagate.

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  • 4. 

    What are the acoustic parameters?

    • Pressure density distance

    • Period frequency amplitude power intensity wavelength propagation speed

    Correct Answer
    A. Period frequency amplitude power intensity wavelength propagation speed
    Explanation
    The given answer lists the various acoustic parameters, which include period, frequency, amplitude, power, intensity, wavelength, and propagation speed. These parameters are used to describe and measure different aspects of sound waves. The period refers to the time it takes for one complete cycle of a wave, frequency is the number of cycles per second, amplitude is the maximum displacement of the wave from its equilibrium position, power is the rate at which energy is transferred by the wave, intensity is the amount of energy per unit of area, wavelength is the distance between two consecutive points in a wave, and propagation speed is the speed at which the wave travels through a medium.

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  • 5. 

    The most commonly used piezoelectric material used in diagnostic ultrasound transducers is?

    • Lead zirconate titanate

    • Barium titanate

    • Rochelle salt

    • Lithim sulfate

    Correct Answer
    A. Lead zirconate titanate
    Explanation
    Lead zirconate titanate is the most commonly used piezoelectric material in diagnostic ultrasound transducers because of its excellent piezoelectric properties. It exhibits a high piezoelectric coefficient, allowing for efficient conversion of electrical energy to mechanical vibrations and vice versa. It also has a high Curie temperature, making it suitable for use in medical applications where high temperatures may be encountered. Additionally, lead zirconate titanate has good mechanical stability and durability, ensuring the longevity and reliability of ultrasound transducers.

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  • 6. 

    Diffuse reflection or back scattering is when the interfaces in the body are not smooth, but have some irregularities. when a wave reflects off an irregular surface, radiates in more than one direction

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Diffuse reflection or back scattering occurs when the interfaces within a body are not smooth and have irregularities. In this case, when a wave reflects off an irregular surface, it radiates in more than one direction. This means that the wave scatters or spreads out in various directions instead of reflecting in a single, focused direction. Therefore, the given answer that this statement is true is correct.

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  • 7. 

    What is the doppler shift frequency?

    • Receiver frequency of ultrasound

    • Transmitted energy

    • Diffrence between the transmitted ultrasound frequency and the received ultrasound frequency.

    • Output power

    Correct Answer
    A. Diffrence between the transmitted ultrasound frequency and the received ultrasound frequency.
    Explanation
    The Doppler shift frequency refers to the difference between the transmitted ultrasound frequency and the received ultrasound frequency. This phenomenon occurs when there is relative motion between the source of the sound waves and the receiver. The frequency of the sound waves appears to be higher when the source and receiver are approaching each other, and lower when they are moving away from each other. By measuring this frequency shift, it is possible to determine the velocity or speed of the source or receiver.

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  • 8. 

    The advantage of Pulse Wave Doppler is that it can measure the signal from the selected are.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Pulse Wave Doppler is a type of ultrasound imaging technique that allows measurement of blood flow velocity. One advantage of Pulse Wave Doppler is that it can selectively measure the signal from a specific area of interest. This means that it can focus on a particular region or vessel, providing more accurate and targeted measurements. Therefore, the statement that the advantage of Pulse Wave Doppler is that it can measure the signal from the selected area is true.

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  • 9. 

    Which type of wavelength sound produces higher quality images with greater detail?

    • Short

    • Long

    • Either one

    Correct Answer
    A. Short
    Explanation
    Short wavelength sound produces higher quality images with greater detail because shorter wavelengths have a higher frequency and can capture more detailed information. This allows for a more precise representation of the sound waves, resulting in a clearer and more detailed image. Longer wavelength sound, on the other hand, has a lower frequency and captures less detailed information, leading to lower quality images with less detail. Therefore, short wavelength sound is preferred for producing higher quality images.

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  • 10. 

    Normal incidence is also called

    • Perpendicular, orthogonal, right angle, 90 degrees

    • Obtuse, acute, orthogonal, 90 degrees

    • Obtuse, 180 degrees, right angle, acute

    • Perpendicular, and obtuse

    Correct Answer
    A. Perpendicular, orthogonal, right angle, 90 degrees
    Explanation
    Normal incidence refers to the situation where a ray of light hits a surface at a 90-degree angle. In this case, the ray is perpendicular to the surface, making the terms "perpendicular," "orthogonal," "right angle," and "90 degrees" all appropriate descriptions of normal incidence.

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  • 11. 

    A pair of waves are considered out of phase when their peaks occur at the same time and location

    • True

    • False

    Correct Answer
    A. False
    Explanation
    the correct answer to this will be in phase NOT out of phase

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  • 12. 

    The active component of the transducer is the:

    • PZT crystal

    • Case

    • Matching layer

    • Backing material

    Correct Answer
    A. PZT crystal
    Explanation
    The active component of a transducer refers to the part that converts one form of energy into another. In this case, the PZT crystal is the active component as it is responsible for converting electrical energy into mechanical energy (and vice versa) through the piezoelectric effect. The case, matching layer, and backing material are all important components of the transducer, but they do not actively convert energy and are therefore not considered the active component.

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  • 13. 

    When a fluid is flowing at a slow and constant rate within a long tube having a uniform diameter, what is the nature of the flow?

    • Direct flow

    • Incompressible flow

    • Turbulent

    • Laminar

    Correct Answer
    A. Laminar
    Explanation
    When a fluid is flowing at a slow and constant rate within a long tube with a uniform diameter, the nature of the flow is laminar. In laminar flow, the fluid moves in smooth layers or streams with little to no mixing between them. The flow is characterized by a steady and orderly movement of the fluid particles in parallel paths. This type of flow occurs when the fluid's viscosity is high, the flow rate is low, and the tube diameter is small.

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  • 14. 

    Code excitation has? 

    • Higher signal-to noise ratio

    • Improved axial resolution

    • Improved spatial resolution

    • Improved contrast resolution

    • Deeper penetration

    • All answers are correct

    Correct Answer
    A. All answers are correct
    Explanation
    The correct answer is that all answers are correct. This means that code excitation has all of the mentioned benefits, including higher signal-to-noise ratio, improved axial resolution, improved spatial resolution, improved contrast resolution, and deeper penetration. This suggests that code excitation is a versatile technique that can improve multiple aspects of imaging quality.

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  • 15. 

    As frequency increases, wavelength decreases

    • True

    • False

    Correct Answer
    A. True
    Explanation
    As frequency increases, the number of waves passing a given point per second increases. Since the speed of waves remains constant, an increase in frequency means that the waves have less time to travel a certain distance. Therefore, the wavelength, which is the distance between two consecutive points in a wave, decreases. This relationship between frequency and wavelength is known as the inverse relationship, where an increase in frequency corresponds to a decrease in wavelength.

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  • 16. 

    With deeper imaging will the listening time lengthen?

    • Yes

    • No

    • Listening time has nothing to do with deep imaging

    Correct Answer
    A. Yes
    Explanation
    The correct answer is "yes" because deeper imaging allows for a more detailed examination of the subject, which in turn can lead to a longer listening time. This is because the additional information obtained from deeper imaging can provide more insights and nuances that may require more time to fully comprehend and analyze.

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  • 17. 

    What occurs on shallow imaging on  PRP?

    • Shorter PRP

    • Longer PRP

    Correct Answer
    A. Shorter PRP
    Explanation
    Shallow imaging on PRP refers to the use of a shorter pulse repetition period (PRP) in ultrasound imaging. PRP is the time interval between consecutive ultrasound pulses. When the PRP is shorter, it means that the ultrasound machine is sending pulses more frequently. This results in a higher pulse repetition frequency (PRF) which allows for better resolution and imaging of superficial structures. Therefore, a shorter PRP would lead to improved visualization of shallow tissues and structures during ultrasound imaging.

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  • 18. 

    Which type of interaction between sound and tissue is most affected by the thermal index (TI)?

    • Reflection

    • Absorption

    • Scattering

    • Refraction

    Correct Answer
    A. Absorption
    Explanation
    The thermal index (TI) is a measure of the potential for heating in tissue caused by ultrasound waves. It indicates the level of energy absorption by the tissue. Absorption refers to the conversion of sound energy into heat energy within the tissue. Therefore, the type of interaction between sound and tissue that is most affected by the TI is absorption.

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  • 19. 

    The pulsar performs the following functions:

    • Generates the electrical signals

    • Controls the timing of the electrical signals

    • Controls the strength and amplitude of the electrical signal

    • All the above

    Correct Answer
    A. All the above
    Explanation
    The correct answer is "All the above" because a pulsar is responsible for generating electrical signals, controlling the timing of these signals, and also controlling the strength and amplitude of the signals. In other words, it performs all of the mentioned functions.

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  • 20. 

    The Advantage of Continuous Wave Doppler is that?

    • TGC is high

    • It can measure high velocities

    • Absorption

    Correct Answer
    A. It can measure high velocities
    Explanation
    Continuous wave Doppler is advantageous because it can measure high velocities. This means that it is able to accurately detect and measure fast-moving objects or fluids within the body. This is particularly useful in medical imaging, as it allows for the assessment of blood flow and velocity in various cardiovascular conditions. By being able to measure high velocities, continuous wave Doppler provides valuable information for diagnosing and monitoring patients.

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  • 21. 

    The percent of time the doppler machine is working to send a pulse is called the?

    • Pulse

    • Repetition frequency

    • Duty Factor

    • Wavelength

    Correct Answer
    A. Duty Factor
    Explanation
    The correct answer is Duty Factor. Duty Factor refers to the percentage of time that a Doppler machine is actively transmitting a pulse. It is calculated by dividing the pulse duration by the pulse repetition period and multiplying by 100. This parameter is important in determining the amount of time the machine spends transmitting pulses compared to the total time. A higher duty factor means that the machine is transmitting pulses more frequently, while a lower duty factor indicates that the machine is transmitting pulses less frequently.

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  • 22. 

    _____ is the distance covered by one cycle.

    • Pulse length

    • Wavelength

    • Cycle distance

    • Cycle duration

    Correct Answer
    A. Wavelength
    Explanation
    wavelength is the length of space that one wave occupies, usually measured in mm, meters, inches.

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  • 23. 

    Sound waves are longitudinal waves sound travels in a straight line

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Sound waves are indeed longitudinal waves, meaning that the particles in the medium vibrate parallel to the direction of wave propagation. This is in contrast to transverse waves, where the particles vibrate perpendicular to the direction of wave propagation. Additionally, sound waves do travel in a straight line, as long as the medium through which they are propagating is uniform and undisturbed. However, sound waves can also be affected by factors such as reflection, refraction, and diffraction, which can cause them to deviate from a straight path.

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  • 24. 

    Amplitude, power, intensity are not adjustable

    • True

    • False

    Correct Answer
    A. False
    Explanation
    all three ARE adjustable

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  • 25. 

    Which variable caused the color change from blue to red of the vessel in this image?

    • Depth

    • Time-gain compensation

    • Change in vessel direction

    • Color artifact

    Correct Answer
    A. Change in vessel direction
    Explanation
    The correct answer is "Change in vessel direction." The color change from blue to red in the vessel is likely due to a change in the direction of the vessel. This could be caused by a change in blood flow or the movement of the vessel itself. The color artifact, depth, and time-gain compensation are not directly related to the change in color from blue to red.

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  • 26. 

    Duty factor of most transducers is?

    • 25

    • 1

    • 50

    • 99

    Correct Answer
    A. 1
    Explanation
    The duty factor of a transducer refers to the ratio of the time the transducer is active or transmitting a signal to the total time. A duty factor of 1 means that the transducer is active or transmitting a signal for 1 of the total time. This indicates that the transducer is only active for a very small portion of the time, and is mostly inactive.

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  • 27. 

    Which factor reduces the likelihood of aliasing in pulsed wave spectral doppler?

    • Increased sample volume depth

    • Increased frequency

    • Increased velocity

    • Increased Nyquist limit

    Correct Answer
    A. Increased Nyquist limit
    Explanation
    Increasing the Nyquist limit reduces the likelihood of aliasing in pulsed wave spectral Doppler. Aliasing occurs when the Doppler frequency exceeds half of the pulse repetition frequency, leading to incorrect representation of blood flow velocities. By increasing the Nyquist limit, which is the maximum detectable blood flow velocity, the range of detectable velocities is expanded, reducing the chances of aliasing. This allows for more accurate and reliable measurements of blood flow velocities.

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  • 28. 

    Code excitation :

    • Does not result in loss of resolution

    • Allows transmitting a long, wide-based pulse

    • Allows high penetration of the sound beam

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Code excitation is a technique used in ultrasound imaging that involves transmitting a long, wide-based pulse. This technique allows for high penetration of the sound beam and does not result in a loss of resolution. Therefore, the correct answer is "All of the above" as all the statements mentioned are true for code excitation.

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  • 29. 

    Positive Doppler Shift occurs when?

    • The source and reflection are moving away from each other.

    • The source and reflection are moving toward each other.

    • The reflector is stationary

    • The sound beam angle is 90 degrees

    Correct Answer
    A. The source and reflection are moving toward each other.
    Explanation
    When the source and reflection are moving toward each other, a positive Doppler Shift occurs. This means that the frequency of the waves appears to be higher to an observer compared to the actual frequency emitted by the source. This phenomenon is commonly observed in situations such as an approaching ambulance siren, where the pitch of the siren appears to increase as it gets closer to the listener.

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  • 30. 

    Which term describes blood flow changes in response to respiration?

    • Phasic flow

    • Superimposed venous flow

    • Flow reversal

    • Low frequency, Low amplitude

    Correct Answer
    A. Phasic flow
    Explanation
    Phasic flow refers to the changes in blood flow that occur in response to respiration. During inhalation, there is an increase in blood flow, while during exhalation, there is a decrease in blood flow. This pattern of flow changes is known as phasic flow and is a normal physiological response. Superimposed venous flow, flow reversal, and low frequency, low amplitude are not terms that specifically describe blood flow changes in response to respiration.

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  • 31. 

    What is a dynamic aperture?

    • Aperture that increases with increasing focal length

    • Decreasing focal length

    • Increasing focal

    • Aperture that decreases

    Correct Answer
    A. Aperture that increases with increasing focal length
    Explanation
    A dynamic aperture refers to an aperture that increases as the focal length increases. This means that as the lens zooms in or extends its focal length, the aperture widens to allow more light to enter the camera. This is particularly useful in low-light situations or when capturing subjects at a distance. By increasing the aperture size, more light can reach the camera sensor, resulting in brighter and better-exposed images.

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  • 32. 

    The best way to correct Aliasing is to:

    • Increase the PRF

    • Select a deeper depth

    • Increased velocity

    Correct Answer
    A. Increase the PRF
    Explanation
    Increasing the PRF (Pulse Repetition Frequency) is the best way to correct Aliasing. Aliasing occurs when the PRF is lower than the Nyquist limit, causing the ultrasound beam to incorrectly interpret the reflected signals. By increasing the PRF, more pulses are emitted per second, allowing for a higher sampling rate and reducing the chances of Aliasing. This ensures that the reflected signals are accurately interpreted and displayed on the ultrasound image.

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  • 33. 

    The degree of turbulence is expressed as a Reynolds number, A Reynolds number is considered turbulent flow when it is greater than: 

    • 500.

    • 1000.

    • 2000.

    • 4000.

    Correct Answer
    A. 2000.
    Explanation
    The Reynolds number is a dimensionless quantity used to determine the type of flow (laminar or turbulent) in a fluid. It is calculated by multiplying the fluid velocity, characteristic length, and fluid density, and dividing it by the fluid viscosity. A Reynolds number greater than 2000 indicates turbulent flow, while a value below 2000 suggests laminar flow. Therefore, the correct answer is 2000.

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  • 34. 

    Which control improves the effects of attenuation?

    • Dynamic range

    • Pulse inversion

    • Multiple focal zones

    • Time-gain compensation

    Correct Answer
    A. Time-gain compensation
    Explanation
    Time-gain compensation is a control that improves the effects of attenuation in ultrasound imaging. Attenuation refers to the weakening of the ultrasound signal as it travels through tissues. Different tissues have different levels of attenuation, and this control helps to compensate for this variation by increasing the gain (amplification) of the signal as it travels deeper into the body. This allows for a more consistent and clearer image throughout the depth of the tissue being imaged.

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  • 35. 

    Which term describes blood flow changes in response to respiration?

    • Phasic

    • Parabolic

    • Spontaneous

    • Pulsatile

    Correct Answer
    A. Phasic
    Explanation
    Phasic is the term that describes blood flow changes in response to respiration. This term refers to the rhythmic variations in blood flow that occur with each breath. During inspiration, there is an increase in blood flow due to the negative intrathoracic pressure, while during expiration, there is a decrease in blood flow. These phasic changes in blood flow are important for maintaining proper oxygenation and perfusion in the body.

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  • 36. 

    Which factor reduces the likelihood of aliasing in pulse wave spectral doppler?

    • Increased sample volume depth

    • Increased frequency

    • Increase velocity

    • Increased Nyquist limit

    Correct Answer
    A. Increased Nyquist limit
    Explanation
    Increasing the Nyquist limit reduces the likelihood of aliasing in pulse wave spectral Doppler. Aliasing occurs when the frequency of the Doppler shift exceeds half of the Nyquist limit, causing the signal to be incorrectly displayed. By increasing the Nyquist limit, the range of detectable frequencies is expanded, reducing the chances of aliasing. This allows for more accurate and reliable measurements in spectral Doppler imaging.

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  • 37. 

    What are the acousitic variables?

    • Pressure, density, distance

    • Period, frequency, amplitude, power, intensity, wavelength, propagation speed

    Correct Answer
    A. Pressure, density, distance
    Explanation
    The acoustic variables are the properties that describe sound waves. Pressure refers to the force exerted by the sound wave on a surface, density is the mass of the air molecules in the sound wave, and distance is the physical separation between two points in the wave. These variables help us understand and measure the characteristics of sound waves.

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  • 38. 

    Period and frequency are determined by?

    • Sound source

    • Sound source and medium

    • Medium

    Correct Answer
    A. Sound source
    Explanation
    The period and frequency of a sound wave are determined by the characteristics of the sound source. The period refers to the time it takes for one complete cycle of the wave, while the frequency is the number of cycles per second. These properties are influenced by factors such as the vibrating object or instrument creating the sound. The medium through which the sound travels does not directly affect the period and frequency of the sound wave.

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  • 39. 

    When the boundary is smooth, the sound is reflected in only one direction in an organized matter is called

    • Diffue reflection

    • Specular

    • Scattering

    • Rayleigh scattering

    Correct Answer
    A. Specular
    Explanation
    When the boundary is smooth, the sound waves reflect in a specific direction in an organized manner. This type of reflection is known as specular reflection. In specular reflection, the angle of incidence is equal to the angle of reflection, resulting in a clear and focused reflection.

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  • 40. 

    Time gain compensation:

    • Compensates for attenuation

    • Cannot be adjusted by sonographer

    • It set incorrectly, will affect the entire image

    • Treats all echoes

    Correct Answer
    A. Compensates for attenuation
    Explanation
    Time gain compensation (TGC) is a feature in ultrasound imaging that compensates for the attenuation of sound waves as they travel through different tissue depths. It automatically adjusts the amplification of the received echoes based on the depth of the tissue being imaged. This compensation helps to maintain a consistent brightness and clarity throughout the image, allowing for better visualization of structures at different depths. Since TGC is automatically adjusted by the ultrasound machine, the sonographer does not have control over it. If set incorrectly, it can affect the entire image by either overcompensating or undercompensating for attenuation. Additionally, TGC treats all echoes equally, regardless of their origin or characteristics.

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  • 41. 

    Snells law describes physics of _______?

    • Ultrasound

    • Reflection

    • Refraction

    • Transmission

    Correct Answer
    A. Refraction
    Explanation
    Snell's law describes the physics of refraction. Refraction is the bending of light or any other wave as it passes from one medium to another with different optical densities. Snell's law mathematically describes the relationship between the angles of incidence and refraction, as well as the indices of refraction of the two media involved. It helps in understanding how light or waves change direction and speed when passing through different materials, such as when light passes from air to water or from water to glass.

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  • 42. 

    Which technique results in a three-dimensional image?

    • Transmission

    • Surface rendering

    • Peak-to peak amplitude

    • None of the above

    Correct Answer
    A. Surface rendering
    Explanation
    Surface rendering is a technique that results in a three-dimensional image. It is a computer graphics method that creates a realistic representation of an object's surface by using shading, texture mapping, and other visual effects. This technique is commonly used in fields such as medical imaging, video games, and computer-aided design (CAD) to create lifelike and detailed 3D models.

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  • 43. 

    How is lateral resolution determined for a pulse-echo system using a tissue-mimicking test object?

    • The gain setting

    • Shallow pins

    • By observing space between reflectors perpendicular to the beam

    • Vertical depth calibration

    Correct Answer
    A. By observing space between reflectors perpendicular to the beam
    Explanation
    Lateral resolution in a pulse-echo system using a tissue-mimicking test object is determined by observing the space between reflectors perpendicular to the beam. This means that the distance between the two reflectors in the direction perpendicular to the ultrasound beam is measured. The smaller the distance, the higher the lateral resolution, indicating the system's ability to distinguish between two closely spaced reflectors. Other factors such as gain setting, shallow pins, and vertical depth calibration may affect the overall performance of the system but are not directly related to determining the lateral resolution.

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  • 44. 

    Speckle reduction technology

    • Provides a cleaner image

    • Makes measurement more difficult

    • Makes tissue identification

    • Results in fast frame rates

    Correct Answer
    A. Provides a cleaner image
    Explanation
    Speckle reduction technology is designed to reduce the presence of speckle noise in ultrasound images, which can degrade image quality and make it difficult to interpret. By reducing this noise, the technology improves the clarity and sharpness of the image, resulting in a cleaner and more visually appealing image for the user.

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  • 45. 

    Which is not an acoustic variable?

    • Density

    • Pressure

    • Distance

    • Intensity

    Correct Answer
    A. Intensity
    Explanation
    4 Variables include: Pressure, Density, Particle Motion (Distance), Temperature

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  • 46. 

    The effects of sound waves on tissue in the body are called?

    • Acoustic propagation properties

    • Bioeffects

    Correct Answer
    A. Bioeffects
    Explanation
    The term "bioeffects" refers to the effects of sound waves on tissue in the body. Sound waves can have various impacts on biological systems, including heating, cavitation, and mechanical stress. These effects can be both beneficial, such as in therapeutic ultrasound, or harmful, such as in excessive exposure to loud noise. Understanding the bioeffects of sound waves is crucial in fields like medicine and occupational health to ensure the safe and effective use of sound-based technologies.

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  • 47. 

    Is pulse repition period (PRP) adjustable?

    • Yes

    • No

    Correct Answer
    A. Yes
    Explanation
    The pulse repetition period (PRP) is the time interval between consecutive pulses in a pulse train. It determines the maximum range that can be measured by a radar system. The PRP is adjustable in radar systems to accommodate different operating conditions and requirements. By adjusting the PRP, the radar system can optimize its performance for various purposes such as increasing range resolution or reducing the effects of clutter. Therefore, the statement "yes" is correct because the PRP is indeed adjustable in radar systems.

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  • 48. 

    With harmonic imaging, how does echo frequency relate to transmitted frequency?

    • Decrease penetration

    • Code excitation

    • Twice the transmitted frequency

    • Focusing

    Correct Answer
    A. Twice the transmitted frequency
    Explanation
    In harmonic imaging, the echo frequency is twice the transmitted frequency. This means that when the ultrasound waves are transmitted into the body, they are at a certain frequency. However, when these waves bounce back and create an echo, the frequency of the echo is twice as high as the transmitted frequency. This phenomenon allows for better image quality and improved penetration into deeper tissues.

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  • 49. 

    What is an advantage of using Pulse wave doppler compared to Continuous wave doppler?

    • No advantage

    • Flow reversal

    • Color side lobe

    • Ability to select sample depth

    Correct Answer
    A. Ability to select sample depth
    Explanation
    Pulse wave doppler allows the user to select the depth at which they want to measure blood flow velocity. This is an advantage compared to continuous wave doppler, which does not provide the ability to select a specific sample depth. By being able to choose the sample depth, clinicians can accurately measure blood flow velocity at specific locations within the body, providing more detailed and precise information about blood flow patterns.

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  • Current Version
  • Dec 02, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 04, 2018
    Quiz Created by
    Jackie

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