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Vascular Ultrasound Questions with Correct Answers
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Vascular Ultrasound Questions with Correct Answers
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Vascular Ultrasound Questions with Correct AnswersCalculating Continuous Wave (CW) Doppler signal frequency Correct
Answer-Doppler angle of 60 degress = 0.5
Examples of sample sizes for Pulsed Wave Doppler Correct Answer-1st
image is good
2nd - sample size is too small
3rd sample size is too large
Spectral Doppler Display Correct Answer-
Doppler Artefacts Correct Answer-Aliasing
Flash
Twinkle
Bleeding
Range Ambiguity Artefact
Mirror Artefact
Vascular System Correct Answer-
Plug flow, disturbed flow and Turbulen flow Correct Answer-
Changes to flow in Normal Laminar Peripheral Arteries Correct
Answer-1. Narrow frequency band (thin line for systolic upstroke)
,2. Short (in time), sharp systolic upstroke
3. Quick drop with narrow band of decelerating forward flow
4. Early diastolic reverse flow (about 20% of the amplitude of the
systolic uptake)
5. Early Diastolic reverse flow (little bit of reverse flow seen under the
baseline after peak)
Poiseuille's Law Correct Answer--calculates rate of flow through a pipe
of confined space (laminar flow)
Q= (πr^4 ∆P)/8ηL
η: viscosity of the fluid
Q: flow rate (volume flowing per time)
ΔP: pressure gradient
r: radius of tube
L: length of tube
Bernoulli's Principle Correct Answer-as the velocity of a fluid increases,
the pressure exerted by the fluid decreases
Continuity Rule Correct Answer-
Artery sizes as they move through the body Correct Answer-
, Layer comparison of elastic arteries vs muscular arteries and Arterioles
Correct Answer-
Capillary Anatomy Correct Answer-
Capillaries when Sphincters are open vs closed Correct Answer-
3 Types of Capillaries Correct Answer-continuous, fenestrated,
sinusoidal
Cardiac Cycle > Windkessel Effect Correct Answer-
Examples of Carotid cardiac cycle in waveform Correct Answer-
velocity waves Correct Answer-The arterial flow wave is composed of
two components - the sum of the forward flow wave from the heart and
the backward flow wave due to reflection of the flow wave at the site of
distal resistance
If the reflective flow wave is reflected back from a high resistance
capillary bed (i.e. lower limb arteries at rest), the combination of
forward and backward flow waves would result in negative flow wave in
diastole resulting in a reversed diastolic wave
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