CET Quality Control & Process Improvement 2 — Questions and Answers
Question 1: Which statistical tool plots data points in time sequence to identify trends or shifts in an echocardiography lab's measurement process?
- Pareto chart
- Run chart (Correct answer)
- Scatter diagram
- Histogram
Correct answer: Run chart
A run chart displays data in chronological order, making it effective for detecting trends, shifts, or cycles in a process over time.
Question 2: In echocardiography QC, a 'sentinel event' most accurately refers to:
- A near-miss that was caught before patient harm
- An unexpected event resulting in serious patient harm or death (Correct answer)
- A routine equipment malfunction requiring service
- An image artifact flagged during peer review
Correct answer: An unexpected event resulting in serious patient harm or death
A sentinel event is an unexpected occurrence involving death or serious physical or psychological injury, requiring immediate investigation and response.
Question 3: When performing a phantom study to evaluate axial resolution, the technician should measure the minimum separation distance at which two targets appear as:
- Overlapping echoes with shared borders
- Two distinct, separate reflectors (Correct answer)
- A single bright echo with increased gain
- A reverberant artifact below the targets
Correct answer: Two distinct, separate reflectors
Axial resolution is defined as the ability to distinguish two reflectors as separate entities along the beam axis; they must appear as distinct points.
Question 4: A lab notices its mean left ventricular ejection fraction (EF) readings are consistently 5% higher than the reference lab's values. This best represents:
- Random measurement error
- Systematic bias (Correct answer)
- High imprecision
- Acceptable inter-lab variability
Correct answer: Systematic bias
A consistent directional offset from a reference standard across many measurements indicates systematic bias rather than random error.
Question 5: Which of the following is the PRIMARY purpose of a laboratory accreditation survey by IAC (Intersocietal Accreditation Commission)?
- To generate revenue for the accrediting body
- To ensure labs meet standardized quality and safety benchmarks (Correct answer)
- To rank labs against each other for reimbursement purposes
- To audit billing practices for Medicare compliance
Correct answer: To ensure labs meet standardized quality and safety benchmarks
IAC accreditation verifies that echocardiography laboratories meet established standards for personnel qualifications, equipment, and study quality.
Question 6: During PDSA cycle implementation in an echo lab, the 'Study' phase primarily involves:
- Training staff on the new protocol
- Analyzing data collected during the 'Do' phase to assess results (Correct answer)
- Writing the new standard operating procedure
- Rolling out the change to the full organization
Correct answer: Analyzing data collected during the 'Do' phase to assess results
The Study phase of the PDSA cycle involves comparing the results of the pilot change against predictions to determine if the intervention worked.
Question 7: When evaluating Doppler spectral quality in a QC audit, which finding would most likely be flagged as suboptimal?
- Dense, well-defined spectral envelope with clear peak velocity
- Faint, poorly defined spectral signal with significant background noise (Correct answer)
- Narrow velocity range with appropriate aliasing noted
- Clear directional flow signal with appropriate gain settings
Correct answer: Faint, poorly defined spectral signal with significant background noise
A faint, noisy spectral Doppler signal indicates inadequate optimization of gain, filter settings, or sample volume placement, compromising velocity accuracy.
CET Quality Control & Process Improvement 2
Which statistical tool plots data points in time sequence to identify trends or shifts in an echocardiography lab's measurement process?