SPI Practice Test Questions and Answers Graded A 2024
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Course
SPI.
Institution
SPI.
transducer
Electronic pulses from the pulser are applied to the ?
amplification, compensation, compression, and demodulation
What functions are preformed by the receiver?
the ratio of the maximum to the minimum intensity that can be displayed
The dynamic range of an ultrasound system is descri...
SPI Practice Test Questions and Answers
Graded A 2024
transducer
Electronic pulses from the pulser are applied to the ?
amplification, compensation, compression, and demodulation
What functions are preformed by the receiver?
the ratio of the maximum to the minimum intensity that can be displayed
The dynamic range of an ultrasound system is described as?
frequency divided by bandwidth
How is the QF of a transducer determined?
PZT
The most common man-made crystal is :
travel time and speed
Which variables must be known in order to calculate distance to a reflector?
pixels
A digital imaging instrument divides the cross-sectional image into?
distal impedance
Pulsatility indexes are quanticative indicators of:
frame
Each individual image of ultrasound is called a:
aperture
______ is the opening or active region of bandwidth
fresnal zone
The area between the face of the transducer and the focus
Fraunhofer zone
The region past the focus
focus
Region in which the beam is most tightly focused
focal zone
Portion of the beam which contains at least 25% of the intensity of the focus
matching layer
Minimizes the acoustic impedance mismatch from Crystal to tissue and tissue back to Crystal
backing material
Shortens spatial pulse length improving longitudinal resolution
resolution
the ability to distinguish between two objects in any of the three dimensions
phasing
Electronic time delays
beam diameter
The minimum displayed lateral dimension of a reflector is approximately equal to _____ ______
axial resolution
SPI Practice Test Questions
,SPI Practice Test Questions
With increased damping, which of the following is increased?
spatial pulse length
The axial resolution of a transducer is determined primarily by the ?
False
True or False: Phased array systems involve the sequential switching of a small group of elements
along the array
An annular array
A transducer which has a collection of ringed elements with a common center is:
unchanged
As the pressure amplitude of ultrasound doubles, what happens to the wavelength?
thickness
What determines the center frequency of a transducer?
decreasing the beam width
which of the following improves lateral resolution?
-decreasing the beam width
-increasing the PRF
-decreasing transmitted frequency
-decreasing the width of the field of view
elements are fired nearly simultaneously
Which statement is true for a linear phased array transducer?
-line density increases with depth
-elements are fired nearly simultaneously
-elements are fired in successive groups
-all scan lines are perpendicular to the face of the transducer
ouput power
What directly affects the ultrasound beam's intensity?
heating with destroy their piezoelectric properties and autoclaving is not effective against all
microorganisms
Transducers cannot be autoclaved because?
3 cm
What is distance to the interface if the round trip time for a sound wave is 39 microseconds?
NZL= (DT^2) x f/ 6
(DT= Aperture)
Write the equation for the Near Zone Length (NZL):
axial
All of the following are the terms used to describe lateral resolution EXCEPT:
-Axial
-Angular
-Transverse
-Azimuthal
electronic
Transducers mostly use steering to scan the regions of interest by the ______ technique
linear phased array
A transducer utilizing rectangular rows of elements that are pulsed at time intervals. Electronic
SPI Practice Test Questions
, SPI Practice Test Questions
focusing and steering.
convex curved transducer
Crystals arranged in a curve that may be sequential or phased
mechanical transducer
A scan head containing a single active element. Mechanical steering with fixed focus
phased array transducer
A collection of electronic pulses in various patterns fired simultaneously. The focusing and
steering are electronic.
Vector array transducer
A combination of arrays that combine linear sequential and linear phased technologies. Multiple
frequencies in the same probe.
linear switched array
Sequential arrays arranged in a line with elements firing in sequence, focusing without steering
Inability to clearly demonstrate small cystic structures
If you are using a transducer with poor elevation resolution, what is the problem you are having?
axial resolution
The best measure of resolution for the current ultrasound instruments is:
to decrease the difference in impedance between the skin and the transducer
The purpose of the matching layer of the transducer assembly is:
angling the beam by sequentially timing the pulses to the crystals
Beam steering refers to:
-The refraction of the beam at tissue interfaces
-Angling the beam by sequentially timing the pulses to the crystals
-Interference effect of the returning sound waves
dynamic aperture
As the returning sound beam strikes the transducer, the size of the transducer surface listening
for echoes is varied. This is accomplished by varying the number of elements used to receive the
reflected signal is known as:
cycles, axial resoltuion
Addition of damping material to a transducer reduces the numberof _________ in the pulse, thus
improving _________.
it is unitless
The unit for quality factor is:
One half of the DB (aperture)
One near zone length is equal to:
DB (Aperture)
At two times the NZL, the diameter of the beam is equal to the ________
trapezoidal
Vector arrays have a ______ shape
bandwidth
The range of frequencies contained in a pulsed ultrasound below and above the resonant
frequency is called:
improves
The damping material in a transducer _______ axial resolution.
quickly
SPI Practice Test Questions
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