1836769
Descrição
Quiz por Corey Briffa, atualizado more than 1 year ago
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Criado por Corey Briffa
quase 10 anos atrás
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Questão 1
Questão
What type of radiation occurs when using ultrasonography?
Responda
-
Mechanical
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Gamma
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Beta
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Ultraviolet
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Sound
Questão 2
Questão
What are the two types of waves that ultrasonography detects?
Responda
-
Compression
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Shear
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Supression
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Tension
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Short wavelength
Questão 3
Questão
What is the region of frequency for ultrasonography?
Responda
-
1-20MHz
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100-250MHz
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1000-2500MHz
Questão 4
Questão
What is absorption? (Ultrasonography)
Responda
-
When the US energy is converted into heat
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When US energy is unable to be detect
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When the US energy reaches a point and bounces back to the detector
Questão 5
Questão
What factors can cause the amplitude to be reduced during an ultrasound? (Three answers)
Responda
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Tissue Properties
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Frequency
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Distance travelled
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Strength of the wavelength
Questão 6
Questão
Is this the correct definition for refraction?
When some or all energy is diverted from its original path
Responda
- True
- False
Questão 7
Questão
Is this the correct definition for diffraction?
Divergence of a beam from sound source
Responda
- True
- False
Questão 8
Questão
Is this the correct definition of Scatter?
Some energy is reflected from a boundary
Responda
- True
- False
Questão 9
Questão
Explain attenuation....
Responda
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The loss of power or amplitude of the ultrasound signal as it passes through tissue
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The ability for the ultrasound to 'attenuate' a low signal, thus making it more detectable
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Attenuation = absorption + scatter + reflection
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This is the term given to the adaptation of the signal as it finds the target tissue.
Questão 10
Questão
Tick all the different types of ultrasound scans
Responda
-
Continuous * pulsed wave
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Pulse-Echo principles (A-scan)
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B-Mode image
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Transmit focussing
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Focused
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Simple
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Z-mode
Questão 11
Questão
Is this the correct definition for the Doppler effect?
The difference between the transmitted frequency (Ft) and the received frequency (Fr)
Responda
- True
- False
Questão 12
Questão
Is it true that colour Dopplers show the difference between arteries and veins?
Responda
- True
- False
Questão 13
Questão
Which of these are relevant to Power Doppler, but not Colour Doppler?
Responda
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Angle independent
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Better Boundary detection
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Detect Blood flow
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Image noise in random flashes of colour
Questão 14
Questão
Choose the benefits of using ultrasound...
Responda
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Real-time Guidance
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Non-ionising radiation
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Speed
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Portable
Questão 15
Questão
What is the correct equation for blood pressure?
Responda
-
Cardiac output x Total peripheral resistance
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Cardiac output x aortic pressure
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Heart rate x Stroke volume
Questão 16
Questão
Tick the different layers of a blood vessel
Responda
-
Tunica Media
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Tunica intima
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Tunia Adventitia
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Tunica medium
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Tunica interna
Questão 17
Questão
Is it true or false that perivascular nerves are found on the outside of the tunica adventitia?
Responda
- True
- False
Questão 18
Questão
Is this statement true?
When vascular smooth muscle relaxes vessel diameter decreases
Responda
- True
- False
Questão 19
Questão
What vessels are key in controlling resistance for circulation?
Responda
-
Small arteries & arterioles
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large arteries & arteriole
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Veins
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Venules
Questão 20
Questão
Define; Isometric tension recording
Responda
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Measuring tension generated by the vascular wall with diameter of the vessel constantly changing.
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Measuring tension generated by the vascular wall with diameter of the vessel remaining constant
Questão 21
Questão
Would isometric tension recording occur, in vitro or in vivo?
Responda
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In vitro
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in vivo
Questão 22
Questão
Is this statement true?
Wire myography requires dissection skills and is better used for small vessels with an internal diameter of 100-400 micrometers.
Responda
- True
- False
Questão 23
Questão
What do changes in tension of a blood vessel indicate?
Responda
-
Vasodilation
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Vasoconstriction
Questão 24
Questão
Is this statement true?
Nitric Oxide is a signalling molecule in the cardiovascular system
Responda
- True
- False
Questão 25
Questão
Pick from the list below, the disadvantages of the cardiovascular techniques studied;
Responda
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Difficulty in studying long term changes
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Cannot measure flow-induced relaxation
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Freshly prepared vessels can be viable for hours
Questão 26
Questão
What does a stretch in smooth muscle cause?
Responda
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Causes muscle contraction
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Causes a tear in the endothelial cells
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Causes muscle relaxation
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Causes a complex molecular signalling pathway that causing a release of further signalling substances
Questão 27
Questão
Is this statement true?
Shear stress has frictional force on the endothelium leading to vasoconstriction
Responda
- True
- False
Questão 28
Questão
What causes the impairment in the sheer stress mechanism to cause vasoconstriction?
Responda
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Cardiovascular disease
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Ageing
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Atherosclerosis
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Renal impairment
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