DEXA Quality Assurance & Equipment Calibration Flashcards
6 cards from real DEXA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 DEXA Quality Assurance & Equipment Calibration flashcards as text
Why should the same DEXA phantom always be used for daily QC on a specific machine?
Answer: Each phantom has a unique density that the machine's baseline is matched to
DEXA baselines are established with a specific phantom; substituting a different phantom invalidates the long-term QC trend data.
What does the term 'accuracy error' mean in the context of DEXA bone densitometry?
Answer: The difference between the measured BMD and the true BMD of the object
Accuracy error is the systematic deviation of measured BMD from the true (reference standard) BMD value.
Which DEXA QA action should be performed if the daily phantom scan image shows unusual artifacts or distortion?
Answer: Halt patient scanning, document findings, and contact the service engineer
Imaging artifacts may indicate detector malfunction; patient scanning must stop until the system is inspected and cleared.
How does temperature and humidity in the scanning room affect DEXA equipment performance?
Answer: Extreme temperatures and humidity outside manufacturer specs can cause detector drift and electronic instability
DEXA detectors and electronics are sensitive to environmental conditions; rooms must stay within manufacturer-specified temperature and humidity ranges.
A DEXA facility performs a semi-annual preventive maintenance visit. Which task is typically included?
Answer: X-ray tube output verification, detector calibration check, and mechanical alignment inspection
Preventive maintenance includes verifying X-ray output, detector calibration, and mechanical alignment to ensure continued measurement accuracy.
What does 'long-term stability' mean in DEXA QA terminology?
Answer: Consistent phantom BMD readings over months to years, confirming no system drift
Long-term stability refers to the DEXA system maintaining consistent phantom BMD values over extended time, confirming no gradual calibration drift.
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