Echocardiogram Testing and Quality Assurance 3 — Questions and Answers
Question 1: Which of the following is a key indicator that a transducer element has failed during QA testing?
- Increased frame rate
- A dark band or dropout artifact in the image (Correct answer)
- Improved lateral resolution
- Decreased acoustic output
Correct answer: A dark band or dropout artifact in the image
Failed transducer elements appear as dark vertical bands or dropout regions in the B-mode image because those elements no longer transmit or receive ultrasound.
Question 2: What does the term 'dynamic range' refer to in echocardiography system performance testing?
- The range of transducer frequencies available
- The ratio of the largest to smallest signal amplitudes the system can display (Correct answer)
- The maximum frame rate achievable
- The depth range over which the focal zone is effective
Correct answer: The ratio of the largest to smallest signal amplitudes the system can display
Dynamic range describes the span of echo signal amplitudes—from the weakest detectable to the strongest—that the system can display simultaneously without saturation or loss.
Question 3: A QA protocol requires checking 'slice thickness' (elevation resolution). Which phantom feature is used for this test?
- Anechoic spherical targets at varying depths (Correct answer)
- Wire targets arranged laterally
- Pin targets arranged axially
- A gel block with no internal targets
Correct answer: Anechoic spherical targets at varying depths
Anechoic spherical cysts of known diameter at varying depths are used to assess slice thickness, because a thick beam slice causes fill-in artifact in small cysts.
Question 4: Which document should a sonographer consult to understand acceptable QA performance tolerances for a specific echocardiography unit?
- The patient's medical record
- The equipment manufacturer's service manual and QA specifications (Correct answer)
- The hospital formulary
- The OSHA safety guidelines
Correct answer: The equipment manufacturer's service manual and QA specifications
The manufacturer's service manual and QA specifications define acceptable performance tolerances unique to each system model.
Question 5: What is the primary purpose of recording baseline QA measurements when a new echocardiography system is first installed?
- To satisfy billing requirements
- To establish reference values for detecting future performance degradation (Correct answer)
- To program the system's default settings
- To calibrate the Doppler color scale
Correct answer: To establish reference values for detecting future performance degradation
Baseline measurements at installation provide reference values so that future QA tests can identify whether performance has degraded over time.
Question 6: During color Doppler QA, a technician observes that aliasing occurs at lower-than-expected velocities. The most likely cause is:
- PRF set too high for the imaging depth
- PRF set too low, reducing the Nyquist limit (Correct answer)
- Incorrect transducer frequency
- Inadequate acoustic output power
Correct answer: PRF set too low, reducing the Nyquist limit
When PRF is set too low, the Nyquist limit decreases and aliasing occurs at lower velocities than expected, indicating a system or operator setting problem.
Question 7: Which of the following best describes 'contrast detail' performance in echocardiography QA?
- The system's ability to display two closely spaced point targets as separate
- The system's ability to distinguish low-contrast lesions from background tissue (Correct answer)
- The maximum depth at which the system can image
- The accuracy of spectral Doppler waveform timing
Correct answer: The system's ability to distinguish low-contrast lesions from background tissue
Contrast detail performance measures how well the system detects subtle differences in echo amplitude between a lesion and surrounding tissue.
Echocardiogram Testing and Quality Assurance 3
Which of the following is a key indicator that a transducer element has failed during QA testing?