QC Test REVIEW 1 Flashcards
Quality control is part of what kind of program?
Quality assurance
What is the purpose of the QC program?
To achieve the best image quality
What does the SMPTE pattern test for?
What does SMPTE stand for?
what does JND stand for?
the luminance response
Society of motion production and television engineers
Just-noticeable-difference
How do we calculate the repeat/reject rate?
What is the optimal number we like to stay within?
What is the primary cause of repeats on DR systems?
Divide total X-rays/ repeat
3-5%
patient positioning
What is a way to test the collimator alignment?
what is the tolerance?
A-penny test
2%
If we are testing the “hardness” of the x-ray beam what are we primarily looking at?
half-value layers
what is the tolerance for SID accuracy?
+/- 2% variance
what is the acceptable range of accuracy for collimator alignment test is?
we find this by using the:
+/- 2% variance
A-penny test
what is the tolerance range for Kvp variations?
5% variance
In Fluro units, what is the tolerance in one direction? (for collimation)
In total?
3% variance
4% variance total
what are the main components in quality control program?
Acceptance test (baseline for new machines)
Annual testing
Diagnose & documenting deviations
Which of the following tests of QC imaging can be performed visually by the radiographer?
what kind?
Uniformity issues
Artifacts
(Also can be uneven spatial resolution or dark noise)
If we are doing a repeat/reject analysis what is a good percent range to stay within?
3-5%
what is a primary reason we see repeats on digital exams?
patient positioning (motion will be on there, nit the primary)
what is the tolerance for timer accuracy?
5% variance
what kind of monitors do we mainly use?
what is the disadvantage?
what is the official name of this disadvantage?
LCD monitors
Limited viewing angle
VAD (viewing angle dependence)
what type of monitor or workstation is critical that the illuminance & contrast is set to a precise setting?
also known as?
Class 1 monitor
Diagnostic work station
What is illuminance?
What tool measures this?
the light that strikes the surface of an object
photometer
what is an example of a class 2 monitor?
what do we use these for?
technologist work station
Post processing & window leveling
What measures illuminance?
photometer
what is the least reliable exposure factor?
What is the tolerance?
MA-linearity
10% (from tube fatigue)
If we are using SMPTE test pattern and use the photometer and place it on the squares to measure the JND, what test are we performing?
luminance response test
if we are measuring resolution within an image what tool do we use?
Lines-pairs tool
What is the spatial resolution we should see on a monitor?
what about on the detector?
2.5 LP/mm
2.5 LP/mm
how often do we test aprons?
annually
What is the tolerance of these:
kVp accuracy:
Exposure reproducibility:
automatic exposure control:
collimator accuracy:
central ray accuracy:
SID accuracy:
Fluro collimation:
what is the Fluro exposure rate? Boost?
Exposure reproducibility?
5%
5%
10%
2%
1%
2%
3% one direction 4% total
10R 20R
5% of the average
