Term
| Factors that affect Grid Ratio (i.e as Grid Ratio increases) |
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Definition
| As Grid Ratio increases, patient dose increases, contrast increases, scatter decreases and detail increases. |
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Term
| Factors that are affected by collimation (i.e collimation is used, it is increasing) |
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Definition
| pt dose decreases, contrast increases, detail increases, scatter decreases. |
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Term
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Definition
| Not choosing the right photo cell, incorrect positioning, inaccurate back up timer, incorrect bucky selection, incorrect kV. |
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Term
| What is the lead requirement for gonadal shielding? |
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Definition
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Term
| What is the relationship between S-Value and noise? |
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Definition
| In most hospitals the S-Value represents exposure, the higher the number the less the exposure. With very high S-Values, the image has a quantum moddle or noise look due to the lack of proper exposure. |
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Term
| What is the relaionship between Digital images and the algorithm they are processed under? |
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Definition
| If a pelvis is processed as a PA Chest, pelvis would have lower optical density. |
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Term
| If a correctly processed pelvis image has an optical density of 100, what would it be if it was processed as a PA chest and a hand? |
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Definition
| PA chest may have any optical density of 50, while a hand would have an optical density somewhere around a 5. |
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Term
| What is the relationship between optical density and S-Values? |
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Definition
| As S-Values increase, the optical density decreases. |
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