DAVIES SPI UPDATED ACTUAL EXAM QUESTIONS CORRECT ANSWERS GRADED A PLUS
Question:
What is a color flash artifact?
Answer:
An artifact in ultrasound imaging that appears as a color signal in areas where there is no true flow,
often caused by motion or tissue harmonics.
Question:
What are wall filters?
Answer:
Filters used in Doppler ultrasound to eliminate low- frequency noise and artifacts from the signal,
enhancing the detection of true blood flow.
Question:
What techniques are used to demonstrate deep flow in sonography?
Answer:
Techniques such as using lower frequency transducers, adjusting the Doppler angle, and optimizing
gain settings to visualize blood flow in deeper structures.
Question:
What is the purpose of Doppler ultrasound?
Answer:
To measure and visualize blood flow and velocity within blood vessels by analyzing the frequency
shifts of ultrasound waves reflected from moving red blood cells.
, Question:
What is aliasing in Doppler ultrasound?
Answer:
A phenomenon that occurs when the velocity of blood flow exceeds the Nyquist limit, causing a
misrepresentation of the flow direction and speed.
Question:
What is the Nyquist limit?
Answer:
The maximum frequency that can be accurately measured in Doppler ultrasound, typically
calculated as half of the pulse repetition frequency (PRF).
Question:
What is the significance of the Doppler angle?
Answer:
The angle between the ultrasound beam and the direction of blood flow, which affects the accuracy
of velocity measurements; ideally, it should be less than 60 degrees.
Question:
What is spectral Doppler?
Answer:
A type of Doppler ultrasound that provides a graphical representation of blood flow velocities over
time, allowing for detailed analysis of hemodynamics.
Question:
What is power Doppler?
Answer:
Question:
What is a color flash artifact?
Answer:
An artifact in ultrasound imaging that appears as a color signal in areas where there is no true flow,
often caused by motion or tissue harmonics.
Question:
What are wall filters?
Answer:
Filters used in Doppler ultrasound to eliminate low- frequency noise and artifacts from the signal,
enhancing the detection of true blood flow.
Question:
What techniques are used to demonstrate deep flow in sonography?
Answer:
Techniques such as using lower frequency transducers, adjusting the Doppler angle, and optimizing
gain settings to visualize blood flow in deeper structures.
Question:
What is the purpose of Doppler ultrasound?
Answer:
To measure and visualize blood flow and velocity within blood vessels by analyzing the frequency
shifts of ultrasound waves reflected from moving red blood cells.
, Question:
What is aliasing in Doppler ultrasound?
Answer:
A phenomenon that occurs when the velocity of blood flow exceeds the Nyquist limit, causing a
misrepresentation of the flow direction and speed.
Question:
What is the Nyquist limit?
Answer:
The maximum frequency that can be accurately measured in Doppler ultrasound, typically
calculated as half of the pulse repetition frequency (PRF).
Question:
What is the significance of the Doppler angle?
Answer:
The angle between the ultrasound beam and the direction of blood flow, which affects the accuracy
of velocity measurements; ideally, it should be less than 60 degrees.
Question:
What is spectral Doppler?
Answer:
A type of Doppler ultrasound that provides a graphical representation of blood flow velocities over
time, allowing for detailed analysis of hemodynamics.
Question:
What is power Doppler?
Answer:
