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31 Cards in this Set
- Front
- Back
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AEC stands for? |
Automatic Exposure Control |
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AEC measures? |
Radiation |
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As soon as the right amount of what is reached the exposure terminates |
Density |
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The tech has control over all exposure factors except |
Time |
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Advantages of AEC |
Image Quality and Less PT dose |
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Radiation detector located between PT and the IR is what? |
Ionization Chamber |
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What's the minimum length of time necessary for AEC to respond to radiation |
1 milli second |
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The type of radiation detector device that uses fluorescent screens to convert light photons to electricity. |
Phototimer |
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What tool can the tech use to set manual techniques when AEC is not available |
Mass Readout |
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ARC controls the amount of |
Radiation reaching the IR |
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The backup timer should be set to what % of expected mA's and is set to terminate at what? |
150% and 600 mAs |
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What allows the tech to adjust how much present radiation is needed by the detectors to terminate exposure |
Density adjustment |
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If a chest XR is being performed using AEC, but only center cell is selected, what will happen to the image |
Over exposure to lungs |
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Which factor is the quantity of x-rays |
mAs |
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mAs controls |
Density |
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If image is really light, but detail is present, what should the tech do with their mAs |
Increase |
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How much of a change is needed to see a change in the density |
30% |
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kVp controls what |
Energy, penetration and quality |
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Contrast is controlled by |
kVp |
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Long scale of contrast means |
More shades of gray |
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Short scale of contrast means |
Less shades of gray more black and white |
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If a film is too gray, what should the tech do to their kVp setting to adjust for scale of contrast |
Decrease |
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Chest x-Ray technique |
3-5 mAs@ 80 kVp |
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Abdomen technique |
30-40mAs@80 kVp |
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What should you do to your techniques for an osteoporotic pt |
Decrease |
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The exposure time is kept shorter in or to |
Reduce pt motion |
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What happens when the tube is not aligned |
Off level grid |
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Potter invented the moving Bucky when |
1920 |
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What was the first moving Bucky called |
Bucky-Potter diaphragm |
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Oscillating grids move how much |
2cm |
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Grid multiplier for no grid, 5:1, 6:1, 8:1, 10:1, 12:1 and 16:1 |
1, 2, 3, 4, 5, 5, 6 |
