Davies for physics boards exam questions and answers with
verified
tions solu-
1. What error will occur if the angle
The velocity estimation will be inaccurate
cor- rect cursor is NOT adjusted
parallel to the vessel wall?
A: The frequency shift will be
underes- timated
B: No Doppler frequency shift will
be detected
C: Mirror imaging of the Doppler
spec- trum will occur
D: The velocity estimation will be
inac- curate
E: Aliasing of the Doppler
spectrum will occur
2. When color Doppler is active,
1-2
how many pulses per scan line are
typically used to create the
underlying B-mode image?
A: 1-2
B: 3-4
C: 5-6
D: 7-8
E: 9-10
3. The packet size in color Doppler refers Pulses per scan line. In B-mode
imagine there is
to the number of? flow?
4. What condition below are most
likely to result in turbulent
, Davies for physics boards exam questions and answers with
verified
tions solu-
ly one pulse per scan line. In color Doppler the number of
pulses is increased between 3 and 32 per scan line
mm vessel with 300 cm/sec flow velocity. Flow becomes
turbulent at high Reynolds number. The
, Davies for physics boards exam questions and answers with
verified
tions solu-
Reynolds number increases with
increasing flow speed and enlarging the
tube diameter. This is why turbulent tends
to occur in the poststenot- ic area. The
vessel diameter is increased and the flow
velocity is still high. The equation for
Reynolds number is: Reynolds number=
average flow speed x tube diameter x
5. After a short walking exercise density.
the ve- nous pressure at the
ankle of the standing normal Lower than the standing ankle pressure at
subject is? rest.
6. What describes occurrence of diastolic It is seen in and proximal to high
resistance ves-
flow reversal in the arterial system? sels
7. Which is true about turbulent flow? Predicted by the Reynolds number
Responsible for murmurs bruits and thrills
It occurs where there are abrupt variations in
ves- sel diameter
It is attected by velocity
8. Loss of fluid energy through inertia? Greatest in a tortuous vessel with
multiple ob-
struction. Tortuous vessels with multiple
obstruc- tion would change direction as well
as the velocity of the blood flow, and this
would create the great- est loss of fluid
energy through inertia.
9. While evaluating the liver you are unable to
vasculature with color Doppler, obtain signals from the
, Davies for physics boards exam questions and answers with
verified
tions solu-
deeper ves- sels. What should Decrease the ultrasound frequency.
you do to enhance you ability to Lower fre- quencies have increased
demonstrate deep flow? penetration compared to high
frequencies
verified
tions solu-
1. What error will occur if the angle
The velocity estimation will be inaccurate
cor- rect cursor is NOT adjusted
parallel to the vessel wall?
A: The frequency shift will be
underes- timated
B: No Doppler frequency shift will
be detected
C: Mirror imaging of the Doppler
spec- trum will occur
D: The velocity estimation will be
inac- curate
E: Aliasing of the Doppler
spectrum will occur
2. When color Doppler is active,
1-2
how many pulses per scan line are
typically used to create the
underlying B-mode image?
A: 1-2
B: 3-4
C: 5-6
D: 7-8
E: 9-10
3. The packet size in color Doppler refers Pulses per scan line. In B-mode
imagine there is
to the number of? flow?
4. What condition below are most
likely to result in turbulent
, Davies for physics boards exam questions and answers with
verified
tions solu-
ly one pulse per scan line. In color Doppler the number of
pulses is increased between 3 and 32 per scan line
mm vessel with 300 cm/sec flow velocity. Flow becomes
turbulent at high Reynolds number. The
, Davies for physics boards exam questions and answers with
verified
tions solu-
Reynolds number increases with
increasing flow speed and enlarging the
tube diameter. This is why turbulent tends
to occur in the poststenot- ic area. The
vessel diameter is increased and the flow
velocity is still high. The equation for
Reynolds number is: Reynolds number=
average flow speed x tube diameter x
5. After a short walking exercise density.
the ve- nous pressure at the
ankle of the standing normal Lower than the standing ankle pressure at
subject is? rest.
6. What describes occurrence of diastolic It is seen in and proximal to high
resistance ves-
flow reversal in the arterial system? sels
7. Which is true about turbulent flow? Predicted by the Reynolds number
Responsible for murmurs bruits and thrills
It occurs where there are abrupt variations in
ves- sel diameter
It is attected by velocity
8. Loss of fluid energy through inertia? Greatest in a tortuous vessel with
multiple ob-
struction. Tortuous vessels with multiple
obstruc- tion would change direction as well
as the velocity of the blood flow, and this
would create the great- est loss of fluid
energy through inertia.
9. While evaluating the liver you are unable to
vasculature with color Doppler, obtain signals from the
, Davies for physics boards exam questions and answers with
verified
tions solu-
deeper ves- sels. What should Decrease the ultrasound frequency.
you do to enhance you ability to Lower fre- quencies have increased
demonstrate deep flow? penetration compared to high
frequencies
