Echocardiogram Programming Fundamentals 3 — Questions and Answers
Question 1: Which machine control adjusts the lateral resolution of a 2D echocardiographic image?
- Dynamic range
- Focus zone placement (Correct answer)
- Overall gain
- Wall filter
Correct answer: Focus zone placement
Placing the focus zone at the depth of interest narrows the ultrasound beam there, maximizing lateral resolution at that level.
Question 2: When using continuous-wave Doppler, what distinguishes it from pulsed-wave Doppler in terms of machine programming?
- CW uses a single piezoelectric element
- CW simultaneously transmits and receives, eliminating range ambiguity but lacking depth discrimination (Correct answer)
- CW is range-gated to a specific depth
- CW cannot measure high-velocity flows
Correct answer: CW simultaneously transmits and receives, eliminating range ambiguity but lacking depth discrimination
CW Doppler uses separate transmitting and receiving elements operating simultaneously, allowing measurement of high velocities without aliasing but with no depth selectivity.
Question 3: A technician increases the wall filter setting during spectral Doppler. What is the expected result?
- Low-velocity, high-amplitude signals from walls are suppressed (Correct answer)
- High-velocity flow signals are eliminated
- Color Doppler aliasing is reduced
- Frame rate decreases
Correct answer: Low-velocity, high-amplitude signals from walls are suppressed
The wall filter (high-pass filter) removes slow-moving, high-amplitude clutter from cardiac walls and valves, cleaning up the spectral display.
Question 4: What is the purpose of the 'dynamic range' or 'compression' control on an echo machine?
- Sets the maximum depth of imaging
- Controls the range of echo amplitudes displayed from weakest to strongest (Correct answer)
- Adjusts the pulse repetition frequency
- Determines color Doppler sensitivity
Correct answer: Controls the range of echo amplitudes displayed from weakest to strongest
Dynamic range determines how many decibels of signal amplitude are mapped to the gray scale, affecting the contrast between strong and weak reflectors.
Question 5: To best visualize left atrial appendage thrombus with transesophageal echo, which imaging frequency should be selected?
- Lower frequency (2–3 MHz) for deeper penetration
- Higher frequency (5–7 MHz) for improved near-field resolution (Correct answer)
- Lowest available frequency to maximize PRF
- Fundamental imaging only to avoid harmonic artifacts
Correct answer: Higher frequency (5–7 MHz) for improved near-field resolution
TEE probes at higher frequencies provide superior near-field resolution, critical for detecting small thrombi in the left atrial appendage.
Question 6: In color M-mode echocardiography, what machine combination is being used?
- 2D imaging overlaid with spectral Doppler
- M-mode cursor line with color Doppler flow information superimposed (Correct answer)
- Color Doppler combined with tissue Doppler
- Harmonic imaging with M-mode sweep speed
Correct answer: M-mode cursor line with color Doppler flow information superimposed
Color M-mode displays temporal flow information along a single scan line as a color map, useful for assessing propagation velocity.
Question 7: Which adjustment reduces the color Doppler sample region to improve frame rate during a color flow study?
- Narrowing the color box width and reducing depth (Correct answer)
- Increasing color gain
- Activating harmonic imaging
- Selecting a lower PRF scale
Correct answer: Narrowing the color box width and reducing depth
A smaller, shallower color box requires fewer scan lines and shorter transit times, allowing the machine to produce more frames per second.
Echocardiogram Programming Fundamentals 3
Which machine control adjusts the lateral resolution of a 2D echocardiographic image?