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MCQ4
1.
In a stenosed segment of a blood vessel the blood flow will display:
a) decreased flow velocities and decreased spectral broadening
b) decreased flow velocities and increased spectral broadening
c) increased flow velocities and decreased spectral broadening
d) increased flow velocities and increased spectral broadening
2.
Doppler frequency aliasing occurs when:
a) the Doppler shift is too high
b) the Doppler angle is 0 degrees
c) the PRF is too high
d) the Doppler angle is 90 degrees
3.
Which of the following lists the intensity values correctly in descending order:
a) Ispta, Isptp, Isata, Isppa
b) Isptp, Isppa, Ispta, Isata
c) Isata, Isptp, Isppa, Ispta
d) Isptp, Ispta, Isppa, Isata
4.
Temporal resolution can be improved by:
a) increasing the number of pulses used to create each image
b) increasing persistence
c) decreasing the number of pulses used to create each image
d) using multiple focal depths
5.
If a given probe has a depth of penetration of 20 cm when it operates at 4.0 MHz what would you expect the depth of penetration would be if its frequency was increased to 8.0 MHz?
a) 5 cm
b) 10 cm
c) 20 cm
d) 40 cm
6.
Range ambiguity occurs when:
a) the ultrasound frequency is too high
b) the depth setting of the image is too large
c) the PRF is too high
d) the PRF is too low
7.
To increase the depth of penetration you would first try:
a) decreasing the ultrasound frequency
b) decreasing the transmit power
c) increasing the transmit power
d) increasing the ultrasound frequency
8.
The frequency of Doppler shifted echoes acquired from moving blood is related to:
a) the speed at which the blood is moving
b) the sine of the Doppler angle
c) the number of moving red cells in the sample volume
d) all of these
9.
A transducer that has been cut into elements both across its width and along its length is called a:
a) matrix array transducer
b) 3-dimensional array transducer
c) composite transducer
d) 1-dimensional array transducer
10.
Reverberation can cause:
a) lateral smearing of tissue structures in the image
b) displacement of a structure in the image to a location lateral to its true position
c) multiple copies of a tissue structure to be displayed lateral to its true position
d) multiple copies of a tissue structure to be displayed at increasing depths
11.
Mirror image artifacts are caused by:
a) slice thickness
b) highly attenuating tissue structures
c) reflection of ultrasound by highly reflective tissue interfaces
d) refraction of ultrasound at curved tissue interfaces
12.
The term rarefaction refers to:
a) increased pressure in the tissues
b) a change in beam direction due to a change in the ultrasound propagation speed
c) absorption of ultrasound by tissue
d) decreased pressure in the tissues
13.
If the ultrasound frequency is increased you would expect the PRF used by the ultrasound machine to:
a) increase or decrease depending on the type of probe
b) increase
c) decrease
d) remain the same
14.
Compared with patient exposure levels in greyscale imaging, exposure levels in pulsed Doppler are:
a) higher because higher ultrasound frequencies are used in Doppler than for imaging
b) lower because the beam is stationary
c) higher to compensate for the poor scattering of ultrasound by blood
d) lower because only the tissues in the sample volume are exposed
15.
The ultrasound transducer is made of one or more materials which are:
a) photoelectric
b) piezoelectric
c) polymorphic
d) electromagnetic
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