SPI MOCK EXAM REGISTRY EXAM E20 2023/2024
Explain time of flight - ANSWER-For every 13 microseconds of time of flight of a pulse, the reflector is 1 cm deeper in the tissue.
Will a doppler shift be recorded if Red blood cell is moving perpendicular to the beam? - ANSWER-No,
Decreasing the ...
SPI MOCK EXAM REGISTRY EXAM E20
2023/2024
Explain time of flight - ANSWER-For every 13 microseconds of time of flight of a pulse, the reflector is 1
cm deeper in the tissue.
Will a doppler shift be recorded if Red blood cell is moving perpendicular to the beam? - ANSWER-No,
Decreasing the pulse repetition period leads to: - ANSWER-a decrease in the maximum depth that can be
imaged
If the PRP decreases, the PRF will ______ which means shorter pulses are emitted more quickly. -
ANSWER-Increase
What two things are necessary for refraction to occur? - ANSWER-oblique incidence of the beam and
two media with different propagation speeds
describe dynamic receive focusing - ANSWER-allows focusing at multiple depths on the image
what media interfaces is most likely to produces ring down artifact? - ANSWER-tissue-gas/air
noise can be reduced by ___________ and _________ - ANSWER-decreasing doppler gain and increasing
wall filter settings
with a higher number of scan lines ______ resolution is degraded - ANSWER-Temporal
What is the advantage of a mechanical annular probe over the mechanical single element probe? -
ANSWER-The array of elements allows for electronic focusing which is not possible with a single element
The primary advantage of continuous wave doppler is: - ANSWER-absence of the Nyquist Limit
, Ultrasound hybrid imaging has shown to be beneficial for: - ANSWER-Liver tumor vascularity
What system control reduces noise and smooths the image using frame averaging? - ANSWER-
persistence
Mirrors and lenses can be used to ________________. - ANSWER-mechanically focus the US beam
Elastography is used in breast imaging to determine the relative _______________ of a mass. - ANSWER-
stiffness
The horizontal axis on m-mode represents: - ANSWER-time
The vertical axis on m-mode represents: - ANSWER-distance
_______ frequency transducers are better for imaging deeper structures due to increased penetration. A
__________ focus will improved the resolution ability at the deeper depths. - ANSWER-Low; longer
The term _______ refers to when all layers of blood flow are moving at relatively the same speed. -
ANSWER-plug flow
The term _______ refers to when blood flow layers are moving at slightly different speeds with the
highest velocity in the center. - ANSWER-laminar flow
Would increasing or decreasing your image depth reduce/eliminate the artifactual echoes within the
lumen caused by range ambiguity. - ANSWER-Increasing
Attenuation increases with: - ANSWER-frequency and distanced traveled
What will increase the display of color doppler information on the image of a superficial mass? -
ANSWER-decreasing threshold
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