Quiz
Ultrasound Physics
Perguntas do quiz (24)
1What is the term for an area of the image where there is no returning echoes (black)
- Ahypoechoic
- Banechoic
- Cechogenic
2What are the advantages of ultrasound?
- AGood soft tissue information, real time, no ionising radiation and accurate measure of structures
- BCan carry out blood studies, relatively quick and cost effective, highly operator dependant, image interpretation
- CCan carry out blood studies, ionising radiation, real time and accurate measure of structures
- DHighly operator dependant, accurate measure of structures, image interpretation, highly operator dependant
3True or False. The frequency of ultrasound is below the human hearing?
- ATrue
- BFalse
4What frequency range is used for ultrasound?
- A20-20,000Hz
- B1-20MHz
- C20-40MHz
- D1-20Hz
5What are the four basic components of ultrasound equipment?
- ATransducer, monitor for display, housing with electronics and controls, coupling gel
- BTransducer, timing device, housing with electronics and controls, recording device
- CTransducer, monitor for display, housing with electronics and controls, recording device
- DTransducer, timing device, housing with electronics and controls, coupling gel
6When was the piezoelectric effect discovered by Jacques and Pierre Curie?
- A1980
- B1950
- C1850
- D1880
7Name the two basic waves by which energy can be transmitted from one point to another
- Aelectromagnetic and mechanical waves
- Bsound and mechanical waves
8True or False? Light and X-rays are electromagnetic waves
- ATrue
- BFalse
9What are mechanical waves described as?
- Apropagation of energy through a medium by cyclic pressure variations
- Bdistinguished by energy, frequency and wavelength
- CMan-made forces changing the frequency of the wave
- Dsimilar to ocean waves
10Which of the following deformable elastic mediums can be used for propagation?
- AAir
- BWater
- CSoft tissue
- DAll of the above
11What is the frequency of a wave?
- AThe difference between maximum value and equilibrium value
- BLength of one cycle
- CThe number of cycles that occur per second
- DThe speed of the soundwave as it passes through the tissue
12True or false? With heavier molecules the sound transmits with faster velocity
- ATrue
- BFalse
13True or False? With more compressable materials (eg air) the sound transmits at a lower velocity
- ATrue
- BFalse
14What part of the beam affects the strength of the echo?
- Aintensity
- Btransducer
- Cshadowing
- Dplacement
15What is the change in direction of an ultrasound beam when it crosses a boundary at an angle?
- ARarefraction
- BAttenuation
- CBeam angling
- DFocusing
16What do the attenuation processes include?
- Aabsorption
- BDivergence
- CScattering
- DReflection
17Which of the following has the lowest attenuation coefficient?
- ABlood
- BLung
- CSoft Tissue
- DBrain
18Absorption
- AIs a result of internal friction forces
- BIs when ultrasound energy is converted into heat
- CIs the change of direction the beam takes when passing through different structures
- DDirectly removes energy from the beam
19True or false? Beam divergence cannot occur after refraction of a curved surface
- ATrue
- BFalse
20What is Rayleigh scattering?
- AWhen the interface the beam hits is
- BWhen the interface the beam hits is >1 wavelength, scattering occurs equally in two directions
- CWhen the interface the beam hits is >1 wavelength, scattering occurs equally in all directions
21Why is scatter a disadvantage?
- Aonly a small portion of the beam returns to the transducer
- BIt creates radiation dose to the patient
- Cscattered waves interact with each other to form back scatter patterns
- DMentally affects the operator
22Which kind of reflection occurs when a soundwave strikes a large smooth surface?
- Anon-specular
- Bdiffuse
- Cspecular
- Dacoustic
23What is acoustic impedance a product of?
- Athe material's density and velocity of ultrasound in the material
- Bthe ultrasound's density and the velocity of the material
- Cthe weight of the transducer and the velocity of ultrasound in the material
- Dthe interface beam angle and the material density
24True or False? Far gain is the amount of gain applied to the distant echoes
- ATrue
- BFalse
Informações
- Descrição
- Quiz sobre Ultrasound Physics, criado por genevieve_f94 em 23-09-2013.
- Autor
- genevieve_f94
- Idioma
- English
- Visualizações
- 103
- Avaliação
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