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Davies Physics SPI Questions correct well detailed answers top rated and updated, Exams of Nursing

Cheyney University of PennsylvaniaNursing

Davies Physics SPI Questions correct well detailed answers top rated and updated

Typology: Exams

2024/2025

Available from 07/06/2025

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Davies Physics SPI Questions correct
well detailed answers top rated and
updated
1. - What can you do to enhance the visibility of a specular reflector?
A) Scan w/ the lowest possible frequency
B) Scan w/ oblique incidence
C) Scan w/ perpendicular incidence
D) Increase distance to the reflector
E) Scan w/ an incident angle of 45 degrees: C) Increase distance to the
reflector
2. - Acoustic impedance increases w/ which of the following?
A) Increased tissue density
B) Increased propagation speed
C) Increased transducer frequency
D) A & B
E) All the above: D) A & B
A) Increased tissue density
B) Increased propagation speed
3. - While performing a Doppler U/S examination, you adjust the pulse
repeti- tion frequency to 12 kHz. This can also be expressed as:
A) 0.12 Hz
B) 1200 Hz
C) 1.2 Hz
D) 12,000 Hz
E) 120 MHz: D) 12,000 Hz
4. - You are imaging a rounded mass w/ irregular borders. The mass has
a much slower propagation speed than surrounding tissue. What sound-
tissue interaction will be encountered as the U/S propagates through
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Davies Physics SPI Questions correct

well detailed answers top rated and

updated

    • What can you do to enhance the visibility of a specular reflector? A) Scan w/ the lowest possible frequency B) Scan w/ oblique incidence C) Scan w/ perpendicular incidence D) Increase distance to the reflector E) Scan w/ an incident angle of 45 degrees: C) Increase distance to the reflector
    • Acoustic impedance increases w/ which of the following? A) Increased tissue density B) Increased propagation speed C) Increased transducer frequency D) A & B E) All the above: D) A & B A) Increased tissue density B) Increased propagation speed
    • While performing a Doppler U/S examination, you adjust the pulse repeti- tion frequency to 12 kHz. This can also be expressed as: A) 0.12 Hz B) 1200 Hz C) 1.2 Hz D) 12,000 Hz E) 120 MHz: D) 12,000 Hz
    • You are imaging a rounded mass w/ irregular borders. The mass has a much slower propagation speed than surrounding tissue. What sound- tissue interaction will be encountered as the U/S propagates through

this interface? A) Refraction B) Reflection C) Absorption D) Scattering E) All the above: E) All the above A) Refraction B) Reflection C) Absorption D) Scattering

    • As a general observation about media in diagnostic sonography, sound propagates faster in materials w/ greater: A) Compressibility B) Acoustic Impedance C)Stiffness D) Refractive Index E) All the above: C) Stiffness
    • Which of the following terms denotes the time it takes for one cycle to occur? A) Frequency B) Amplitude C) Wavelength D) Period E) Pressure: D) Period
    • Which of the following would increase the spatial pulse length? A) Increased PRF B) Decreased # of transmit pulses per frame C) Increased # of transmit pulses per second D) Increased # of transmit pulses per line E) Increased # of cycles per pulse: E) Increased # of cycles per pulse
    • In order to display a structure on your sonographic image, the sound beam must be reflected at the interference. What is required for sound reflection at the interference of two structures?
    • Power divided by the beam area is equal to the: A) Probe angle B) Speed of Sound C) Intensity D) Attenuation E) Amplitude: C) Intensity
    • If sound waves of 3 MHz, 5 MHz, and 10 MHz are transmitted through the same section of anatomy, reflections form which frequency would reach the transducer first? A) 3 MHz B) 5 MHz C) 10 MHz D) Reflections from all three frequencies would have nearly identical transit times E) It's not possible to predict which will arrive first: D) Reflections from all three frequencies would have nearly identical transit times
    • The intensity transmission coefficient at the interface between two struc- tures equals 1/100. What is the intensity reflection coefficient? A) 0/ B) 99/ C) 1/ D) 100/ E) 49/100: B) 99/
    • Interference patterns of reflected waves cause: A) Acoustic speckle B) Acoustic enhancement C) Rarefaction D) Volume averaging E) All the above: A) Acoustic speckle
    • During a diagnostic U/S examination, you encounter all of the interactions of U/S and tissue listed below. Which one will NOT cause direction of part of the U/S energy? A) Reflection

B) Scattering C) Divergence D) Absorption E) Refraction: D) Absorption

    • The mass you are imaging has a diameter of 35 mm. This value can also be expressed as: A) 350 cm B) 0.35 cm C) 3.5 cm D) 35 m E) 3.5 m: C) 3.5 cm
    • Which describes constructive interference? A) Sound waves are in phase and resulting amplitude is increased B) Sound waves are in phase and resulting amplitude is decreased C) Sound waves are out of phase and resulting amplitude is increased D) Sound waves are out of phase and resulting amplitude is decreased E) None of the above: A) Sound waves are in phase and resulting amplitude is increased
    • Which phenomenon is associated w/ a pattern produced by a sound beam after passing through a small aperture? A) Scattering B) Absorption C) Diffraction D) Interference E) Diffuse reflection: C) Diffraction
    • What system control should you adjust to compensate for sound attenu- ation w/ increasing depth? A) Dynamic range B) TGC C) Transmit power D) Overall receiver gain E) Focus position: B) TGC
    • You are imaging a structure containing two media having the same impedance. What will occur at the boundary of the two
    • Bulk modulus is closely related to which of the following qualities? A) Attenuation B) Frequency C) Wavelength D) Volume E) Stiffness: E) Stiffness
    • The rate of sound attenuation is lowest in: A) Air B) Water C) Liver D) Bone E) Lung: B) Water
    • If the number of cycles in a pulse is increased but the wavelength remains the same, which of the following is true? A) The frequency is increased B) The propagation speed is increased C) The pulse duration is increased D) The period is decreased E) The bulk modulus is decreased: C) The pulse duration is increased
    • Which of the following factors does NOT affect impedance? A) Stiffness B) Density C) Propagation Speed D) Frequency E) All the above affect impedance: D) Frequency
    • According to Snell's Law, the angle of transmission is related to the incident beam angle and: A) The amount of acoustic impedance mismatch at an interface B) The change in frequency that occurs at an interface C) One-half the angle of incidence D) The relative speeds of sound in the two media E) The percentage of diffraction distal to the interface: D) The relative speeds of sound in the two media
    • The length of space over which one cycle occurs is known as the:

A) Duty factor B) Spatial pulse length C) Wavelength D) Pulse repetition frequency E) Pulse duration: C) Wavelength

    • An echo from which one of the following sound reflectors is most depen- dent on the angle of incidence? A) Rayleigh scatterer B) Diffuse reflector C) Specular reflector D) Acoustic scatterer E) Nonspecular reflector: C) Specular reflector
    • What term refers to regions of decreased particle density in a sound beam? A) Attenuation B) Transmission C) Compression D) Rarefaction E) Reverberation: D) Rarefaction
    • What occurs when you image a structure w/ oblique incidence? A) A very strong reflection will occur since this is the optimal angle for imaging B) All of the sound will be reflected due to the poor scanning angle C) All of the sound will be transmitted due to the poor scanning angle D) The angle of reflection will be oriented away from the transducer, resulting in decreased visualization of the structure E) The amount of scattering will be reduced with a scanning angle of 45, result- ing in a cleaner image with reduced artificial echoes: D) The angle of reflection will be oriented away from the transducer, resulting in decreased visualization of the structure
    • One Mhz equals: A) 10^3 Hz B) 10^-3 Hz C) 10^6 Hz

D) Decibels E) Potential energy: A) Heat

    • Which of the following statements regarding the effect of frequency on Rayleigh scattering is TRUE? A) The amount of scattering is not affected by frequency B) Scattering intensity doubles if frequency is doubled C) Doubling the frequency results in halving the scattering intensity D) Doubling the frequency results in quartering the scattering intensity E) Scattering intensity is proportional raised to the four power: E) Scattering intensity is proportional raised to the four power
    • Attenuation of the sound beam is affected by: A) Absorption B) Scattering C) Reflection D) Propagation speed E) A, B, & C: E) A, B, & C
  3. Relative measurement of intensity based on a logarithmic scale is ex- pressed in: A) Newtons per cm^ B) Watts per cm^ C) Decibels D) Pascals E) Neper: C) Decibels
  4. As you perform a sonographic exam, you switch from a 3.5 MHz transducer to a 7.0 MHz transducer to image a superficial a structure. Compared to the 3.5 MHz transducer, what will the 7.0 MHz attenuation rate and wavelength be? A) Double the attenuation rate, one-half the wavelength B) Double the attenuation rate, double the wavelength C) One- fourth the attenuation rate, one-half the wavelength D) One-half the attenuation rate, double the wavelength E) One-half the attenuation rate, one-fourth the wavelength: A) Double the attenuation rate, one-half the wavelength
    • You are imaging w/ a 5 MHz linear array transducer. What sound

parameter stays constant as the beam propagates through the tissue? A) Frequency B) Intensity C) Amplitude D) Wavelength E) None of these: E) None of these

    • Which of the following properties would result in increased propagation speed of sound through a medium? A) Increased stiffness B) Increased density C) Increased frequency D) Increased distance E) Increased amplitude: A) Increased stiffness
    • Doppler pulses used for diagnostic purposes are typically cycles long: A) 0- 2 B) 2- 3 C) 4- 5 D) 5- 30 E) Greater than 100: D) 5- 30
    • Which of the following best characteristics an ultrasound wave in human tissue? A) Mechanical longitudinal wave B) Radioactive wave C) TRV rarefactional wave D) Electromagnetic wave E) Electronic piezoelectric wave: A) Mechanical longitudinal wave
    • Which of the following is most likely also to decrease beam intensity? A) Increasing acoustic output B) Decreasing receiver gain C) Increasing focusing D) Increasing beam area E) Increasing amplitude: D) Increasing beam area

describes the reflected echo signals after they have traversed the tissue? A) The echo signals will be shifted down in frequency due to the increased attenuation of higher frequencies B) The echo signals will be reduced intensity but will have the same frequency content as the transmitted beam C) The echo signals will be shifted upward in frequency due to increased absorption of the lower frequencies D) Only the center frequency component of the bandwidth will be reflected back to the Tx E) The echo signal frequency content will be identical to that of the transmitted beam: A) The echo signals will be shifted down in frequency due to the increased attenuation of higher frequencies

    • The propagation speed for sound is lowest in which of the following biological tissues? A) Fat B) Blood C) Muscle D) Bone E) Liver: A) Fat
    • The regions of low pressure and density that are formed during sound propagation are termed: A) Compressions B) Shear waves C) Rarefactions D) Cavitation E) Bulk Modulus: C) Rarefactions
    • While imaging a cyst, you notice shadowing posterior to each lateral border of the cyst. What is the source of the shadows? A) Redirection of the sound beam at an interface w/ different propagation speeds and a curved surface B) Bending of the sound beam due to different media propagation speeds C) Increased attenuation of the sound beam at the borders of the cyst

D) Lateral misregistration of the cyst due to a multipath artifact E) Diffraction of the sound beam resulting in a weakened signal at the lateral borders of the cyst: B) Bending of the sound beam due to different media propa- gation speeds

    • Attenuation of the sound beam increases w/ increasing: A) Path length B) Absorption C) Frequency D) Scattering & Reflection E) All the above: E) All the above
    • For pulsed U/S, which of the following factors determines the frequency of the sound wave? A) Pulse repetition Frequency (PRF) B) Transmitter Frequency C) Area of the Transducer elements D) Pressure applied to the transducer E) All the above: B) Transmitter Frequency
    • What sound tissue interaction is necessary to form an U/S image? A) Rarefaction B) Refraction C) Reflection D) Diffraction E) Interface: C) Reflection
    • When you image a structure that is a specular reflector, the strength of the received signal depends on the following two factors: A) Difference in acoustic impedance and angle of incidence B) Difference in acoustic velocity and interface size C) Difference in acoustic velocity and motion of reflector D) Angle of incidence and tissue temperature E) Bulk modulus and interface size: A) Difference in acoustic impedance and angle of incidence
  5. You are performing a sonographic exam on a large patient. Which trans- ducer would provide the least amount of signal attenuation?