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SPI Review | 373 Updated Questions and Answers 100% Correct |
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SPI Review | 373 Updated Questions andAnswers 100% Correct | 2024-2025
What does the mechanical index on an ultrasound indicate? - ANSWER The
likelihood of cavitation during an ultrasound exam
The term for a transducer that has an array of rectangular elements arranged in a
straight line is: - ANSWER linear array
What describes the f number? - ANSWER focal length divided by the
aperture
What is the purpose of applying multiple matching layers to the transducer face? -
ANSWER multiple layers results in an increase in transducer bandwidth
Axial resolution is improved with:
A. Increased bandwidth
B. Shorter pulse length
C. Shorter wavelength
D. B and C
E. All of the above - ANSWER E. All of the above
What advantage is obtained by steering a linear array transducer to create a
trapezoidal shape in an ultrasound image? - ANSWER Improved field of
view
,What is the advantage of using multiple transmit focal zones? - ANSWER
Increased lateral resolution
Which transducer will exhibit the LEAST amount of volume averaging?
A. Mechanical single element
B. 1.5D of multi-row array
C. Linear array
D. Phased array
E. Convex array - ANSWER B. 1.5 D or multi-row array
Which control would you adjust to alter the dynamic range of the displayed
echoes? - ANSWER Compression
While performing an ultrasound examination, you decide to adjust the system
settings to improve the image. Which of the following is not user-adjustable?
A. frequency
B. power
C. gain
D. compensation (TGC)
E. echo arrival time - ANSWER E. echo arrival time
What control should you adjust to modify the image if the attenuation coefficient
of the tissue is very high? - ANSWER Compensation (aka TGC/depth gain
compensation)
,Which is an assumption of sonographic imaging that determines how detected
echoes are mapped in the image? - ANSWER Echoes originate from the
most recently transmitted pulse
With A-mode, the strength of the echo signal is represented by: - ANSWER
the height of the spike
You are imaging a 3D dataset that has anisotropic resolution. What does this
mean? - ANSWER Unequal resolution is present between imaging planes.
If the beam is wider than the vessel, tissue on either side of that vessel will send
back reflections, resulting in fill-in of the fluid structure. This problem is
represented by what type of resolution? - ANSWER slice thickness
Which of the following contributes to improve the axial resolution in a B-mode
image?
A. increased aperture
B. increased bandwidth
C. focusing with an acoustic lens
D. increased dynamic range
E. beam steering - ANSWER B. increased bandwidth
Loss of fluid energy through inertia is greatest in what kind of vessel? -
ANSWER a tortuous vessel with multiple obstructions
Describe the occurrence of diastolic flow reversal in the arterial system. -
ANSWER It is seen in and proximal to high-resistance vessels.
, An image shows a pseudoaneurysm sac. In the image, gray-scale echoes within
the flow are visible and the color does not fill the aneurysm sac completely. What
control is used to optimize the image to allow the color to write over the gray-
scale echoes? - ANSWER threshold
The control that sets the gray-scale brightness at which color will be displayed
instead of gray-scale at a pixel location is termed: - ANSWER priority
The Reynolds number increases with increasing:
A. flow speed
B. vessel diameter
C. blood density
D. blood flow viscosity
E. all of the above - ANSWER e. all of the above
The terms "ensemble length" and "dwell time" are synonymous with:
A. persistence
B. packet size
C. pulse repetition frequency
D. color threshold
E. autocorrelation - ANSWER B. packet size
What Doppler control removes frequencies below a given threshold, resulting in a
clean zero baseline? - ANSWER high pass filter
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