225631
Beschreibung
Quiz von genevieve_f94, aktualisiert more than 1 year ago
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Erstellt von genevieve_f94
vor etwa 11 Jahre
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Frage 1
Frage
What is the term for an area of the image where there is no returning echoes (black)
Antworten
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hypoechoic
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anechoic
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echogenic
Frage 2
Frage
What are the advantages of ultrasound?
Antworten
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Good soft tissue information, real time, no ionising radiation and accurate measure of structures
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Can carry out blood studies, relatively quick and cost effective, highly operator dependant, image interpretation
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Can carry out blood studies, ionising radiation, real time and accurate measure of structures
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Highly operator dependant, accurate measure of structures, image interpretation, highly operator dependant
Frage 3
Frage
True or False. The frequency of ultrasound is below the human hearing?
Antworten
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True
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False
Frage 4
Frage
What frequency range is used for ultrasound?
Antworten
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20-20,000Hz
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1-20MHz
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20-40MHz
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1-20Hz
Frage 5
Frage
What are the four basic components of ultrasound equipment?
Antworten
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Transducer, monitor for display, housing with electronics and controls, coupling gel
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Transducer, timing device, housing with electronics and controls, recording device
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Transducer, monitor for display, housing with electronics and controls, recording device
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Transducer, timing device, housing with electronics and controls, coupling gel
Frage 6
Frage
When was the piezoelectric effect discovered by Jacques and Pierre Curie?
Antworten
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1980
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1950
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1850
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1880
Frage 7
Frage
Name the two basic waves by which energy can be transmitted from one point to another
Antworten
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electromagnetic and mechanical waves
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sound and mechanical waves
Frage 8
Frage
True or False? Light and X-rays are electromagnetic waves
Antworten
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True
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False
Frage 9
Frage
What are mechanical waves described as?
Antworten
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propagation of energy through a medium by cyclic pressure variations
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distinguished by energy, frequency and wavelength
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Man-made forces changing the frequency of the wave
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similar to ocean waves
Frage 10
Frage
Which of the following deformable elastic mediums can be used for propagation?
Antworten
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Air
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Water
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Soft tissue
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All of the above
Frage 11
Frage
What is the frequency of a wave?
Antworten
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The difference between maximum value and equilibrium value
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Length of one cycle
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The number of cycles that occur per second
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The speed of the soundwave as it passes through the tissue
Frage 12
Frage
True or false? With heavier molecules the sound transmits with faster velocity
Antworten
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True
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False
Frage 13
Frage
True or False? With more compressable materials (eg air) the sound transmits at a lower velocity
Antworten
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True
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False
Frage 14
Frage
What part of the beam affects the strength of the echo?
Antworten
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intensity
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transducer
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shadowing
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placement
Frage 15
Frage
What is the change in direction of an ultrasound beam when it crosses a boundary at an angle?
Antworten
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Rarefraction
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Attenuation
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Beam angling
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Focusing
Frage 16
Frage
What do the attenuation processes include?
Antworten
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absorption
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Divergence
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Scattering
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Reflection
Frage 17
Frage
Which of the following has the lowest attenuation coefficient?
Antworten
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Blood
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Lung
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Soft Tissue
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Brain
Frage 18
Frage
Absorption
Antworten
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Is a result of internal friction forces
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Is when ultrasound energy is converted into heat
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Is the change of direction the beam takes when passing through different structures
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Directly removes energy from the beam
Frage 19
Frage
True or false? Beam divergence cannot occur after refraction of a curved surface
Antworten
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True
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False
Frage 20
Frage
What is Rayleigh scattering?
Antworten
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When the interface the beam hits is
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When the interface the beam hits is >1 wavelength, scattering occurs equally in two directions
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When the interface the beam hits is >1 wavelength, scattering occurs equally in all directions
Frage 21
Frage
Why is scatter a disadvantage?
Antworten
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only a small portion of the beam returns to the transducer
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It creates radiation dose to the patient
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scattered waves interact with each other to form back scatter patterns
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Mentally affects the operator
Frage 22
Frage
Which kind of reflection occurs when a soundwave strikes a large smooth surface?
Antworten
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non-specular
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diffuse
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specular
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acoustic
Frage 23
Frage
What is acoustic impedance a product of?
Antworten
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the material's density and velocity of ultrasound in the material
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the ultrasound's density and the velocity of the material
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the weight of the transducer and the velocity of ultrasound in the material
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the interface beam angle and the material density
Frage 24
Frage
True or False? Far gain is the amount of gain applied to the distant echoes
Antworten
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True
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False
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