1836769
Descripción
Test por Corey Briffa, actualizado hace más de 1 año
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Creado por Corey Briffa
hace más de 9 años
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Pregunta 1
Pregunta
What type of radiation occurs when using ultrasonography?
Respuesta
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Mechanical
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Gamma
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Beta
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Ultraviolet
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Sound
Pregunta 2
Pregunta
What are the two types of waves that ultrasonography detects?
Respuesta
-
Compression
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Shear
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Supression
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Tension
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Short wavelength
Pregunta 3
Pregunta
What is the region of frequency for ultrasonography?
Respuesta
-
1-20MHz
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100-250MHz
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1000-2500MHz
Pregunta 4
Pregunta
What is absorption? (Ultrasonography)
Respuesta
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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
Pregunta 5
Pregunta
What factors can cause the amplitude to be reduced during an ultrasound? (Three answers)
Respuesta
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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
Pregunta 6
Pregunta
Is this the correct definition for refraction?
When some or all energy is diverted from its original path
Respuesta
- True
- False
Pregunta 7
Pregunta
Is this the correct definition for diffraction?
Divergence of a beam from sound source
Respuesta
- True
- False
Pregunta 8
Pregunta
Is this the correct definition of Scatter?
Some energy is reflected from a boundary
Respuesta
- True
- False
Pregunta 9
Pregunta
Explain attenuation....
Respuesta
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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.
Pregunta 10
Pregunta
Tick all the different types of ultrasound scans
Respuesta
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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
Pregunta 11
Pregunta
Is this the correct definition for the Doppler effect?
The difference between the transmitted frequency (Ft) and the received frequency (Fr)
Respuesta
- True
- False
Pregunta 12
Pregunta
Is it true that colour Dopplers show the difference between arteries and veins?
Respuesta
- True
- False
Pregunta 13
Pregunta
Which of these are relevant to Power Doppler, but not Colour Doppler?
Respuesta
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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
Pregunta 14
Pregunta
Choose the benefits of using ultrasound...
Respuesta
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Real-time Guidance
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Non-ionising radiation
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Speed
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Portable
Pregunta 15
Pregunta
What is the correct equation for blood pressure?
Respuesta
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Cardiac output x Total peripheral resistance
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Cardiac output x aortic pressure
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Heart rate x Stroke volume
Pregunta 16
Pregunta
Tick the different layers of a blood vessel
Respuesta
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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
Pregunta 17
Pregunta
Is it true or false that perivascular nerves are found on the outside of the tunica adventitia?
Respuesta
- True
- False
Pregunta 18
Pregunta
Is this statement true?
When vascular smooth muscle relaxes vessel diameter decreases
Respuesta
- True
- False
Pregunta 19
Pregunta
What vessels are key in controlling resistance for circulation?
Respuesta
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Small arteries & arterioles
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large arteries & arteriole
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Veins
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Venules
Pregunta 20
Pregunta
Define; Isometric tension recording
Respuesta
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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
Pregunta 21
Pregunta
Would isometric tension recording occur, in vitro or in vivo?
Respuesta
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In vitro
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in vivo
Pregunta 22
Pregunta
Is this statement true?
Wire myography requires dissection skills and is better used for small vessels with an internal diameter of 100-400 micrometers.
Respuesta
- True
- False
Pregunta 23
Pregunta
What do changes in tension of a blood vessel indicate?
Respuesta
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Vasodilation
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Vasoconstriction
Pregunta 24
Pregunta
Is this statement true?
Nitric Oxide is a signalling molecule in the cardiovascular system
Respuesta
- True
- False
Pregunta 25
Pregunta
Pick from the list below, the disadvantages of the cardiovascular techniques studied;
Respuesta
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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
Pregunta 26
Pregunta
What does a stretch in smooth muscle cause?
Respuesta
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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
Pregunta 27
Pregunta
Is this statement true?
Shear stress has frictional force on the endothelium leading to vasoconstriction
Respuesta
- True
- False
Pregunta 28
Pregunta
What causes the impairment in the sheer stress mechanism to cause vasoconstriction?
Respuesta
-
Cardiovascular disease
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Ageing
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Atherosclerosis
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Renal impairment
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