20 Questions
Which of the following is true about the angle of insonation and color display?
When the flow is parallel to the beam, there is an improved color display.
During inspiration, what happens to the pressure in the thoracic cavity?
It decreases.
What effect does inspiration have on venous return to the heart from the upper body?
It increases.
What effect does inspiration have on flow in the lower extremities?
It decreases.
What is responsible for moving flow through the venous system?
Respiration and muscle contraction.
What effect does expiration have on intrathoracic pressure?
It increases.
What effect does expiration have on venous return to the heart from the upper body?
It decreases.
What effect does expiration have on flow in the lower extremities?
It remains the same.
What does the image processor in ultrasound do?
Performs preprocessing, postprocessing, persistance, pixel interpolation functions.
What happens to the image data once preprocessing is changed?
It is permanently changed for all upcoming images.
Which term is used to describe the number of pulses per scan line in ultrasound imaging?
Packet Size
What is the typical range for packet size in ultrasound imaging?
3-32
How does increasing packet size affect frame rate and temporal resolution?
Decreases frame rate and decreases temporal resolution
In which case is it beneficial to have a high packet size in ultrasound imaging?
Testicular torsion detection
What is the purpose of parallel processing in ultrasound imaging?
To improve frame rate and temporal resolution
What is the function of autocorrelation in ultrasound imaging?
To automatically correlate data from multiple sampling sites
How does increasing the Doppler PRF affect the color scale settings in ultrasound imaging?
Increases the color scale settings
What effect does increasing the angle of insonation have on the amount of color displayed in ultrasound imaging?
Decreases the amount of color displayed
What is the minimum number of pulses per scan line required for processing and displaying color in ultrasound imaging?
3
What is the main limitation of velocity measurement accuracy in autocorrelation-based Doppler ultrasound imaging?
Angle correction is not utilized
Test your knowledge on packet size in ultrasound imaging and its impact on frame rate, temporal resolution, and the detection of Doppler shift. Learn about the importance of finding the right balance for accurate color Doppler imaging.
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