Understanding Ultrasound Physics - SPI
Exam Review – ARTIFACTS Exam
Questions And Answers
While using a linear sequential array transducer during a color
Doppler exam, the shape of the grayscale image is most often
_______, Whereas the shape of the color Doppler portion of the
image is _______.
A. rectangular, parallelogram
B. rectangular, sector
C. sector, trapezoid
D. square, rectangular -
correct answer ✅A. rectangular, parallelogram
The shape of a grayscale image using a linear sequential array is
rectangular. However, the sound beams used for Doppler are
steered at an angle, creating a parallelogram shaped region.
What is the meaning of the term "analysis" in the context of
spectral analysis of Doppler signals?
A. Building a sophisticated signal from components
B. building a simplified signal from components
,Understanding Ultrasound Physics - SPI
Exam Review – ARTIFACTS Exam
Questions And Answers
C. identifying the building blocks or components of a complex signal
D. measuring a complex signal then modifying its information
content -
correct answer ✅C. identifying the building blocks or components
of a complex signal
The term analysis defines the act of scrutinizing an object to
determine what individual components are incorporated within it.
In Doppler analysis, the complex signal is broken down into its more
basic ingredients.
The analysis of Doppler Spectra using _______ is most accurate.
A. Zero crossing detectors
B. fast fourier transforms
C. time interval histograms
D. chirp Z transforms -
correct answer ✅B. fast fourier transforms
,Understanding Ultrasound Physics - SPI
Exam Review – ARTIFACTS Exam
Questions And Answers
The fast fourier transform, or FFT, is the most accurate spectral
analysis technique. Techniques such as zero crossing, time interval
histograms, and chirp Z were initially used to assess Doppler
Spectra, but are now obsolete. Fast fourier analysis became popular
when computers were incorporated into ultrasound systems.
Spectral analysis of color flow Doppler is most commonly
performed by which of the following techniques?
A. Zero crossing detectors
B. fast fourier transforms
C. autocorrelation
D. Chirp Z transforms -
correct answer ✅C. autocorrelation
Autocorrelation is a technique of choice for spectral analysis of
color Doppler. Although the most accurate technique is the FFT,
autocorrelation is better suited to process the enormous amount of
data acquired in a color Doppler study.
Acoustic artifacts include: (more than one answer may be correct.)
, Understanding Ultrasound Physics - SPI
Exam Review – ARTIFACTS Exam
Questions And Answers
A. images of reflectors in an inappropriate position
B. Images of reflectors with improper shape
C. images of reflectors with incorrect brightness
D. images that do not correspond to anatomical structures -
correct answer ✅A. images of reflectors in an inappropriate
position
B. Images of reflectors with improper shape
C. images of reflectors with incorrect brightness
D. images that do not correspond to anatomical structures
An artifact is an error in imaging. All of the choices indicate a type
of error, and therefore, are artifacts.
Which of the following is not a potential cause of artifact and
diagnostic imaging?
A. Operator error
B. equipment malfunction
Exam Review – ARTIFACTS Exam
Questions And Answers
While using a linear sequential array transducer during a color
Doppler exam, the shape of the grayscale image is most often
_______, Whereas the shape of the color Doppler portion of the
image is _______.
A. rectangular, parallelogram
B. rectangular, sector
C. sector, trapezoid
D. square, rectangular -
correct answer ✅A. rectangular, parallelogram
The shape of a grayscale image using a linear sequential array is
rectangular. However, the sound beams used for Doppler are
steered at an angle, creating a parallelogram shaped region.
What is the meaning of the term "analysis" in the context of
spectral analysis of Doppler signals?
A. Building a sophisticated signal from components
B. building a simplified signal from components
,Understanding Ultrasound Physics - SPI
Exam Review – ARTIFACTS Exam
Questions And Answers
C. identifying the building blocks or components of a complex signal
D. measuring a complex signal then modifying its information
content -
correct answer ✅C. identifying the building blocks or components
of a complex signal
The term analysis defines the act of scrutinizing an object to
determine what individual components are incorporated within it.
In Doppler analysis, the complex signal is broken down into its more
basic ingredients.
The analysis of Doppler Spectra using _______ is most accurate.
A. Zero crossing detectors
B. fast fourier transforms
C. time interval histograms
D. chirp Z transforms -
correct answer ✅B. fast fourier transforms
,Understanding Ultrasound Physics - SPI
Exam Review – ARTIFACTS Exam
Questions And Answers
The fast fourier transform, or FFT, is the most accurate spectral
analysis technique. Techniques such as zero crossing, time interval
histograms, and chirp Z were initially used to assess Doppler
Spectra, but are now obsolete. Fast fourier analysis became popular
when computers were incorporated into ultrasound systems.
Spectral analysis of color flow Doppler is most commonly
performed by which of the following techniques?
A. Zero crossing detectors
B. fast fourier transforms
C. autocorrelation
D. Chirp Z transforms -
correct answer ✅C. autocorrelation
Autocorrelation is a technique of choice for spectral analysis of
color Doppler. Although the most accurate technique is the FFT,
autocorrelation is better suited to process the enormous amount of
data acquired in a color Doppler study.
Acoustic artifacts include: (more than one answer may be correct.)
, Understanding Ultrasound Physics - SPI
Exam Review – ARTIFACTS Exam
Questions And Answers
A. images of reflectors in an inappropriate position
B. Images of reflectors with improper shape
C. images of reflectors with incorrect brightness
D. images that do not correspond to anatomical structures -
correct answer ✅A. images of reflectors in an inappropriate
position
B. Images of reflectors with improper shape
C. images of reflectors with incorrect brightness
D. images that do not correspond to anatomical structures
An artifact is an error in imaging. All of the choices indicate a type
of error, and therefore, are artifacts.
Which of the following is not a potential cause of artifact and
diagnostic imaging?
A. Operator error
B. equipment malfunction
