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img crit ch 33

image critique - QA and QC

QuestionAnswer
What filtration is needed for tubes operating at 70 kVp and above? 2.5 mmAleq
What filtration is needed for tubes operating between 50 and 70 kVp? 1.5 mmAleq
What filtration is needed for tubes operating at 50 kVp and below? .5 mmAleq
How much can the alignment of the collimator and bucky tray be off? +/- 2% of the SID
How much can the tolerance for the CR be off? +/- 1%
How much can the tolerance for the angulation be off? +/- 1%
How much can the tolerance for the exposure timer be off? +/- 5% if over 10ms or +/-20% if under or at 10ms
How do we check the phototimer accuracy? expose 2 AL or acrylic pieces of different thickness. They should have the same OD
How do we know if the rectifier is at fault for an exposure timer error? there should be 30 dots, half the number of dots always means it’s the rectifier
What is the 9 penny test used for? to determine if the alignment between the collimator and bucky is within range.
Reciprocity combinations of mA and s that yield the same mAs
Linearity a sequential increase in mAs should produce the same sequential increase in exposure
Reproducibility exposure she be the same if the same settings are used
How much can the tolerance for reproducibility be off? +/- 5% (same as the variance in voltage supply)
How much can the tolerance for film illuminators (viewboxes) be off? +/- 10%
According to federal law ESE for flouro shall not exceed: 10R per minute (100mGy per min)
According to federal law ESE for angiography shall not exceed: 20R per minute (200mGy per min)
ESE readout for cassette spot films in flouro: 200mR
ESE readout for photo-flourospot images in flouro: 100mR
Allowable variance in tube arc for tomo (greater than 30 degrees): +/- 5 degrees
Allowable variance in tube arc for tomo (less than 30 degrees): +/- 2 degrees
Repeat rates should fall between: 3-10% averaging at 8%
Created by: annaluz87
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