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[Show more]Relationship between FREQUENCY & WAVELENGTH? CORRECT ANSWERS: inverse 
 
Equation for WAVELENGTH CORRECT ANSWERS: wavelength (mm) = prop speed (mm/microsec)/frequency (MHz) (L = C/F) 
 
Equation of WAVELENGTH in soft tissue CORRECT ANSWERS: wavelength (mm) = 1.54 (mm/microsec) / frequency (MHz) 
...
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Add to cartRelationship between FREQUENCY & WAVELENGTH? CORRECT ANSWERS: inverse 
 
Equation for WAVELENGTH CORRECT ANSWERS: wavelength (mm) = prop speed (mm/microsec)/frequency (MHz) (L = C/F) 
 
Equation of WAVELENGTH in soft tissue CORRECT ANSWERS: wavelength (mm) = 1.54 (mm/microsec) / frequency (MHz) 
...
If a renal artery Doppler exam demonstrates normal flow, but stenosis is identified on angiography evaluation, the US results are described as: 
a.) False negative 
b.) False positive 
c.) True negative 
d.) True positive CORRECT ANSWERS: a.) False negative 
 
What information from an angiography ...
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Add to cartIf a renal artery Doppler exam demonstrates normal flow, but stenosis is identified on angiography evaluation, the US results are described as: 
a.) False negative 
b.) False positive 
c.) True negative 
d.) True positive CORRECT ANSWERS: a.) False negative 
 
What information from an angiography ...
Relationship between FREQUENCY & WAVELENGTH? CORRECT ANSWERS: inverse 
 
Equation for WAVELENGTH CORRECT ANSWERS: wavelength (mm) = prop speed (mm/microsec)/frequency (MHz) (L = C/F) 
 
Equation of WAVELENGTH in soft tissue CORRECT ANSWERS: wavelength (mm) = 1.54 (mm/microsec) / frequency (MHz) 
...
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Add to cartRelationship between FREQUENCY & WAVELENGTH? CORRECT ANSWERS: inverse 
 
Equation for WAVELENGTH CORRECT ANSWERS: wavelength (mm) = prop speed (mm/microsec)/frequency (MHz) (L = C/F) 
 
Equation of WAVELENGTH in soft tissue CORRECT ANSWERS: wavelength (mm) = 1.54 (mm/microsec) / frequency (MHz) 
...
Reducing the likelihood of bioeffects from acoustic energy is the mission of the: 
 
A. Nyquist limit 
B. Reynolds number 
C. Huygens principle 
D. ALARA principle 
E. Poiseuille principle CORRECT ANSWERS: D. ALARA principle 
 
The number of cycles in a pulse directly related to the: 
 
A. Dut...
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Add to cartReducing the likelihood of bioeffects from acoustic energy is the mission of the: 
 
A. Nyquist limit 
B. Reynolds number 
C. Huygens principle 
D. ALARA principle 
E. Poiseuille principle CORRECT ANSWERS: D. ALARA principle 
 
The number of cycles in a pulse directly related to the: 
 
A. Dut...
Sound waves are: CORRECT ANSWERS: longitudinal, mechanical 
 
The speed of sound in soft tissue is closest to: CORRECT ANSWERS: 1,500 m/s 
 
The frequency closest to the lower limit of ultrasound is: CORRECT ANSWERS: 15,000 Hz 
 
Which is not an acoustic variable? CORRECT ANSWERS: intensity 
 
T...
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Add to cartSound waves are: CORRECT ANSWERS: longitudinal, mechanical 
 
The speed of sound in soft tissue is closest to: CORRECT ANSWERS: 1,500 m/s 
 
The frequency closest to the lower limit of ultrasound is: CORRECT ANSWERS: 15,000 Hz 
 
Which is not an acoustic variable? CORRECT ANSWERS: intensity 
 
T...
What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? 
A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. 
B: Prolong the sonogram to make videos of the fetus for each fam...
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Add to cartWhat action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? 
A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. 
B: Prolong the sonogram to make videos of the fetus for each fam...
Sound waves are: 
a) electric 
b) mechanical, transverse 
c) spectral 
d) longitudinal, mechanical CORRECT ANSWERS: D 
 
The speed of sound of ultrasound in soft tissue is closest to: 
a) 1,540 km/sec 
b) 1.54 km/sec 
c) 1,500 m/s 
d) 1,540 mm/sec CORRECT ANSWERS: C 
 
Which is not an acoust...
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Add to cartSound waves are: 
a) electric 
b) mechanical, transverse 
c) spectral 
d) longitudinal, mechanical CORRECT ANSWERS: D 
 
The speed of sound of ultrasound in soft tissue is closest to: 
a) 1,540 km/sec 
b) 1.54 km/sec 
c) 1,500 m/s 
d) 1,540 mm/sec CORRECT ANSWERS: C 
 
Which is not an acoust...
What is a hydrophone? What does it measure? CORRECT ANSWERS: A small needle with piezoelectric crystal at the end. It measures pressure in a sound beam. 
 
What is a schlieren? CORRECT ANSWERS: A machine that uses acousti-optics to measure sound and light in beam profiles. 
 
What is a calorimeter...
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Add to cartWhat is a hydrophone? What does it measure? CORRECT ANSWERS: A small needle with piezoelectric crystal at the end. It measures pressure in a sound beam. 
 
What is a schlieren? CORRECT ANSWERS: A machine that uses acousti-optics to measure sound and light in beam profiles. 
 
What is a calorimeter...
Concentration of force in an area. Units are: (Pa) or Pascals. CORRECT ANSWERS: Pressure 
 
What are the units for density? CORRECT ANSWERS: kg/cm3 
 
What are the seven acoustic parameters and what are they determined by? CORRECT ANSWERS: -Period determined by SOURCE 
-Frequency determined by SO...
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Add to cartConcentration of force in an area. Units are: (Pa) or Pascals. CORRECT ANSWERS: Pressure 
 
What are the units for density? CORRECT ANSWERS: kg/cm3 
 
What are the seven acoustic parameters and what are they determined by? CORRECT ANSWERS: -Period determined by SOURCE 
-Frequency determined by SO...
Incident intensity is? CORRECT ANSWERS: The intensity of the sound beam just before it strikes a reflector 
 
Describe normal incidence, and oblique incidence. CORRECT ANSWERS: Normal incidence is when the sound beam hits a reflector at a 90* angle, and oblique is any angle other than 90*. 
 
Rayl...
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Add to cartIncident intensity is? CORRECT ANSWERS: The intensity of the sound beam just before it strikes a reflector 
 
Describe normal incidence, and oblique incidence. CORRECT ANSWERS: Normal incidence is when the sound beam hits a reflector at a 90* angle, and oblique is any angle other than 90*. 
 
Rayl...
Which of the following do the source and the medium determine? 
 
a. duty factor 
b. frequency 
c. propagation speed 
d. axial resolution CORRECT ANSWERS: d. 
 
Axial resolution is affected by all of the following EXCEPT 
 
a. frequency 
b. damping 
c. spatial pulse length 
d. focusing CORRECT ANS...
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Add to cartWhich of the following do the source and the medium determine? 
 
a. duty factor 
b. frequency 
c. propagation speed 
d. axial resolution CORRECT ANSWERS: d. 
 
Axial resolution is affected by all of the following EXCEPT 
 
a. frequency 
b. damping 
c. spatial pulse length 
d. focusing CORRECT ANS...
When the ELASTICITY of a medium is HIGH, the _____ is HIGH 
 
- stiffness 
- prop. speed 
- compressibility 
- reflectivity CORRECT ANSWERS: compressibility 
 
What term describes the # of cycles that an acoustic variable completes in a second? 
 
- period 
- freq. 
- PRP 
- variable rate C...
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Add to cartWhen the ELASTICITY of a medium is HIGH, the _____ is HIGH 
 
- stiffness 
- prop. speed 
- compressibility 
- reflectivity CORRECT ANSWERS: compressibility 
 
What term describes the # of cycles that an acoustic variable completes in a second? 
 
- period 
- freq. 
- PRP 
- variable rate C...
Ultrasound Physics CORRECT ANSWERS: An accurate diagnosis requires an accurate representation of cardiac anatomy 
An accurate representation of cardiac anatomy is influenced by principles of ultrasound physics and design of instrumentation 
 
Sonography CORRECT ANSWERS: "To write with sound" 
So...
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Add to cartUltrasound Physics CORRECT ANSWERS: An accurate diagnosis requires an accurate representation of cardiac anatomy 
An accurate representation of cardiac anatomy is influenced by principles of ultrasound physics and design of instrumentation 
 
Sonography CORRECT ANSWERS: "To write with sound" 
So...
What is described as the ability of an object to resist compression and relates to the hardness of a medium? CORRECT ANSWERS: stiffness 
 
An increase in PRF would lead to CORRECT ANSWERS: an increase in DF 
 
what has the higher propagation speed? air, bone, soft tissue or water CORRECT ANSWERS:...
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Add to cartWhat is described as the ability of an object to resist compression and relates to the hardness of a medium? CORRECT ANSWERS: stiffness 
 
An increase in PRF would lead to CORRECT ANSWERS: an increase in DF 
 
what has the higher propagation speed? air, bone, soft tissue or water CORRECT ANSWERS:...
All of the following are AIUM recommendations regarding the use of ultrasound, except: 
A. Always adhere to the ALARA principle when scanning 
B. Limit the examination time to the shortest time necessary to complete a diagnostic exam 
C. In order to limit ultrasound intensity, always use PW Doppler ...
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Add to cartAll of the following are AIUM recommendations regarding the use of ultrasound, except: 
A. Always adhere to the ALARA principle when scanning 
B. Limit the examination time to the shortest time necessary to complete a diagnostic exam 
C. In order to limit ultrasound intensity, always use PW Doppler ...
The doppler effect is observed as a change in ________ and has units of _________. CORRECT ANSWERS: Frequence, per second 
 
In clinical imaging, which reflectors produce most relevant Doppler shifts? CORRECT ANSWERS: Red blood cells 
 
If red blood cells are traveling TOWARD a trasducer, the F em...
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Add to cartThe doppler effect is observed as a change in ________ and has units of _________. CORRECT ANSWERS: Frequence, per second 
 
In clinical imaging, which reflectors produce most relevant Doppler shifts? CORRECT ANSWERS: Red blood cells 
 
If red blood cells are traveling TOWARD a trasducer, the F em...
frequency and period CORRECT ANSWERS: inverse 
 
stiffness and propagation speed CORRECT ANSWERS: direct 
 
density and propagation speed CORRECT ANSWERS: inverse 
 
frequency and wavelength CORRECT ANSWERS: inverse 
 
power and amplitude CORRECT ANSWERS: direct 
 
proportional to amplitude squ...
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Add to cartfrequency and period CORRECT ANSWERS: inverse 
 
stiffness and propagation speed CORRECT ANSWERS: direct 
 
density and propagation speed CORRECT ANSWERS: inverse 
 
frequency and wavelength CORRECT ANSWERS: inverse 
 
power and amplitude CORRECT ANSWERS: direct 
 
proportional to amplitude squ...
When sound hits a boundary between two media of the same propagation speed at oblique incidence: CORRECT ANSWERS: no refraction will occur. 
 
Refraction requires the oblique incidence of sound across a boundary between two media with different propagation speeds. 
 
As transducer frequency increas...
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Add to cartWhen sound hits a boundary between two media of the same propagation speed at oblique incidence: CORRECT ANSWERS: no refraction will occur. 
 
Refraction requires the oblique incidence of sound across a boundary between two media with different propagation speeds. 
 
As transducer frequency increas...
what is an artifact CORRECT ANSWERS: echo that do not correspond actual with anatomy, not in right location, size or shape, Too bright or dark, missing from image completely. 
 
propagation artifacts CORRECT ANSWERS: occur due to bending (refraction), redirection (reflection) or reverberation of s...
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Add to cartwhat is an artifact CORRECT ANSWERS: echo that do not correspond actual with anatomy, not in right location, size or shape, Too bright or dark, missing from image completely. 
 
propagation artifacts CORRECT ANSWERS: occur due to bending (refraction), redirection (reflection) or reverberation of s...
1. The term Anechoic in relation to a sonographic image means? 
A. structure that appears lighter than the surrounding structures 
B. The absence of echos 
C. A structure that appears the same as surrounding structures 
D. A structure that reflects 100% of the sound wave CORRECT ANSWERS: B. The abs...
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Add to cart1. The term Anechoic in relation to a sonographic image means? 
A. structure that appears lighter than the surrounding structures 
B. The absence of echos 
C. A structure that appears the same as surrounding structures 
D. A structure that reflects 100% of the sound wave CORRECT ANSWERS: B. The abs...
Doppler Shift CORRECT ANSWERS: Doppler Frequency - A change or variation in the frequency of sound as a result of motion between the sound source & the receiver. 
= received frequency - transmitted frequencies 
 
Positive Doppler Shift CORRECT ANSWERS: Reflected frequency is higher than transmitt...
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Add to cartDoppler Shift CORRECT ANSWERS: Doppler Frequency - A change or variation in the frequency of sound as a result of motion between the sound source & the receiver. 
= received frequency - transmitted frequencies 
 
Positive Doppler Shift CORRECT ANSWERS: Reflected frequency is higher than transmitt...
Absorption CORRECT ANSWERS: The conversion of sound energy to heat 
 
Acoustic speckle CORRECT ANSWERS: The interference pattern caused by scatters and produces the granular appearance of tissue on a sonographic image 
 
Amplitude CORRECT ANSWERS: The maximum or minimum deviation of an acoustic v...
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Add to cartAbsorption CORRECT ANSWERS: The conversion of sound energy to heat 
 
Acoustic speckle CORRECT ANSWERS: The interference pattern caused by scatters and produces the granular appearance of tissue on a sonographic image 
 
Amplitude CORRECT ANSWERS: The maximum or minimum deviation of an acoustic v...
Electronic pulses from the pulser are applied to the CORRECT ANSWERS: Transducer 
 
Which of the following is performed by the receiver CORRECT ANSWERS: Amplification, compensation, compression, demodulation 
 
The dynamic range of ultrasound system is defined as CORRECT ANSWERS: The ratio of the...
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Add to cartElectronic pulses from the pulser are applied to the CORRECT ANSWERS: Transducer 
 
Which of the following is performed by the receiver CORRECT ANSWERS: Amplification, compensation, compression, demodulation 
 
The dynamic range of ultrasound system is defined as CORRECT ANSWERS: The ratio of the...
Sensitivity CORRECT ANSWERS: ability of a test to detect disease when it IS present 
 
Specificity CORRECT ANSWERS: ability of a test to rule out disease when it is NOT present 
 
Positive Predictive Value (PPV) CORRECT ANSWERS: Calculates how often a positive study is correctly diagnosed: abilit...
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Add to cartSensitivity CORRECT ANSWERS: ability of a test to detect disease when it IS present 
 
Specificity CORRECT ANSWERS: ability of a test to rule out disease when it is NOT present 
 
Positive Predictive Value (PPV) CORRECT ANSWERS: Calculates how often a positive study is correctly diagnosed: abilit...
Which of the following is used to eliminate the low-frequency signals that appear as noise as a result of wall/valve motion? 
A. High-pass filter 
B. Bass-thump filter 
C. Low-pass filter 
D. High-frequency filter CORRECT ANSWERS: A. High-pass filter 
AKA wall filter 
AKA wall-thump filter 
 
Acco...
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Add to cartWhich of the following is used to eliminate the low-frequency signals that appear as noise as a result of wall/valve motion? 
A. High-pass filter 
B. Bass-thump filter 
C. Low-pass filter 
D. High-frequency filter CORRECT ANSWERS: A. High-pass filter 
AKA wall filter 
AKA wall-thump filter 
 
Acco...
Which gain will increase the risk of bioeffects? 
a. transmit 
b. receive 
c. gain 
d. overall gain CORRECT ANSWERS: a. transmit 
 
Which of the following is considered the memory of an ultrasound instrument? 
a. pulser 
b. transducer 
c. receiver 
d. beam former 
e. digital scan converter 
f. disp...
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Add to cartWhich gain will increase the risk of bioeffects? 
a. transmit 
b. receive 
c. gain 
d. overall gain CORRECT ANSWERS: a. transmit 
 
Which of the following is considered the memory of an ultrasound instrument? 
a. pulser 
b. transducer 
c. receiver 
d. beam former 
e. digital scan converter 
f. disp...
In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... CORRECT ANSWERS: Remain the Same because stiffness and density affect Propagation Speed. 
 
What is the audible range? CORRECT ANSWERS: 20-20,000Hz 
 
>20,000Hz=Ultrasound 
 
Frequency is measured in COR...
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Add to cartIn soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... CORRECT ANSWERS: Remain the Same because stiffness and density affect Propagation Speed. 
 
What is the audible range? CORRECT ANSWERS: 20-20,000Hz 
 
>20,000Hz=Ultrasound 
 
Frequency is measured in COR...
What is dynamic aperture? 
A.aperture that varies with transmit frequency 
B.aperture that decreases as a function of time 
C.aperture that increases with increasing focal length 
D.aperture that changes as a function of frame rate CORRECT ANSWERS: C 
 
to which acoustic variable is penetration dep...
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Add to cartWhat is dynamic aperture? 
A.aperture that varies with transmit frequency 
B.aperture that decreases as a function of time 
C.aperture that increases with increasing focal length 
D.aperture that changes as a function of frame rate CORRECT ANSWERS: C 
 
to which acoustic variable is penetration dep...
The horizontal axis, or x-axis CORRECT ANSWERS: Runs side to side 
 
The vertical axis, or y-axis CORRECT ANSWERS: Runs up and down 
 
Unrelated CORRECT ANSWERS: Two items that are not associated 
 
Related or Proportional CORRECT ANSWERS: Two items that are associated or affiliated 
However, t...
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Add to cartThe horizontal axis, or x-axis CORRECT ANSWERS: Runs side to side 
 
The vertical axis, or y-axis CORRECT ANSWERS: Runs up and down 
 
Unrelated CORRECT ANSWERS: Two items that are not associated 
 
Related or Proportional CORRECT ANSWERS: Two items that are associated or affiliated 
However, t...
Which artifact is illustrated by this image? CORRECT ANSWERS: a) Shadowing 
b) Side Lobe 
c) Reverberation 
d) Mirroring 
 
What is increased if the pulse duration is decreased? CORRECT ANSWERS: a) Bandwidth 
b) Line Density 
c) Frame Rate 
d) Duty Factor 
 
What is the most appropriate action fo...
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Add to cartWhich artifact is illustrated by this image? CORRECT ANSWERS: a) Shadowing 
b) Side Lobe 
c) Reverberation 
d) Mirroring 
 
What is increased if the pulse duration is decreased? CORRECT ANSWERS: a) Bandwidth 
b) Line Density 
c) Frame Rate 
d) Duty Factor 
 
What is the most appropriate action fo...
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