What is the motorized synchronous spinning top test tool used for?
To check the timer accuracy of a three-phase unit.
What is the Wisconsin test cassette used for?
To test the accuracy of kVp settings.
What is an R-meter used for?
To measure radiation output during mA reciprocity, linearity, and reproducibility tests.
What is a photometer used to measure?
The luminance and ambient light output of technologist and radiologist display monitors.
What does the collimator test tool check?
The accuracy of collimation shutters when adjusting the light field (penny test)
What does the beam alignment test tool determine?
Whether the primary x-ray beam is perpendicular from source to IR.
What is this test?
Images from a manual spinning top (single-phase) timer test. Used to test the time of exposure
What is this test?
Images from a synchronous/electronic timer (3-phase/HF) test. Used to test the time of exposure
What is this test?
Collimator penny test. Used to verify collimator field accuracy within ±2% of SID.
What is this test?
Wisconsin kVp test. Used to test the accuracy of the kVp used during the exposure.
What formula is used to calculate arc angle for a synchronous/electronic timer test?
360° × time (seconds) = degree of arc.
What does the mA reciprocity test evaluate?
Whether different mA/time combinations producing the same mAs yield equal radiation output/quantity.
What device is used for the mA reciprocity test?
An R-meter.
What is the acceptable tolerance for mA reciprocity?
±10% of each R meter reading
What does the CR reproducibility test check?
Whether the same technique produces a consistent radiation output/intensity from one exposure to another.
What is the tolerance for CR reproducibility?
±5% of each R meter reading
How can CR reproducibility test help test the calibration of a CR reader?
By making at least 4 exposures using the same kVp, mA, and time. All 4 exposure index (EI) values should match.
What does the CR reader/linearity test evaluate?
Measures the proportionate accuracy of the radiation output of one mA station compared to another mA station.
What is the tolerance for CR reader/linearity test?
±10% of each R meter reading
How can the linearity test be used to test CR calibration?
Make 3 exposures with the same time but double the mA each time…This should double the mAs and radiation output. All 3 images should be processed in the same CR reader. EI values will increase/decrease proportionately
For Konica CR, what happens when mAs doubles?
S-number decreases by 1/2 (inverse system).
For Agfa CR, what happens when mAs doubles?
EI value doubles (direct system).
What is the ideal DI?
0.
What does a DI of -3 require?
Increase mAs by ×2 or increase kVp by +15%.
