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