MRO module 4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Density | The overall amount of blackening on a radiograph; also called optical density or radiographic density
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| Contrast | The differences in density on adjacent areas of the radiograph
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| What determines the energy of the x-ray beam? | kVp
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| mAs literally controls the current through the x-ray tube. T or F? | True
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| In general, which kVp is appropriate for a very thick and dense anatomic area to ensure penetration? 40, 50, 60, 70 | 70kVp
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| The level or degree of penetration of the x-ray beam is a primary factor in determining the scale of contrast. T or F? | True
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| mAs should be used to control which of the following. 1)Contrast 2)Scatter 3)Density? | Density
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| kVp affects which of the following. 1)Scatter 2)Patient dose 3)Density 4)All of the above? | All of the above
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| Aluminum equivalent | A measurement of the filtering capacity of a filter comparing it to the filtration provided by aluminum
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| Grid ratio | The ratio between the height of the lead strips in a grid and the width of the interspace material between them
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| Intensifying screen | A device that converts x-ray photons to light photons to help create the latent image on the film, thereby reducing the x-ray exposure required
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| What are the standard distances used in general radiography? | 40 and 72
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| What is the purpose of a grid? | Absorb scatter
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| Convert 24 mAs used for slow-speed screens to a mAs appropriate for fast screens? | 6mAs. (x=24x1/4)
(new mAs=old mAs x old speed factor/new speed factor)
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| Increasing the speed screen allows for a reduction in the mAs needed for a given projection. T or F? | True
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| If 20mAs is used as a non-grid technique, what mAs should be used with an 8:1 grid? | 80mAs. (x=20x4/1)
(new mAs=old mAs x new bucky factor/old bucky factor)
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| If 20mAs is used at a 40-inch SID, what mAs should be used at 72inches to maintain density? | 64.8mAs or round to 65mAs
(new mas=(72/40)^2 x 20)
(new mas=3.24x20)
(64.8)
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| If a 14x17 inch field is collimated to a 9x9 inch field with no other changes, what will happen to density? | Decrease
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| Fixed kVp technique chart | A technique chart in which the kVp stays the same but different mAs selections are used for patients of different thickness
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| Variable technique kVp chart | A technique chart in which the mAs stays the same but different kVp selections are used for patients of different thickness
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| What increases voltage to kilovoltage in the x-ray circuit? | Step-up transformer
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| All photons produced in an x-ray beam will have the same ability to penetrate. T or F? | False
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| In the filament circuit, voltage is stepped down before passing to the filament. T or F? | True
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| mAs controls density by controlling what? | Number of electrons boiled off of the filament.
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| In general, we try to keep OID as large as possible. T or F? | False
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| Grid ratio is the expression of the relationship between the lead strips and the interspace material. T or F? | True
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| When compared to NOT using intensifying screens, use of a screen reduces patient dose. T or F? | True
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| The use of precise collimation helps to reduce scatter reduction. T or F? | True
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| The infant and elderly patient may require a decrease in technique from the average. T or F? | True
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| The selection of kVp is based on the desired scale of contrast and penetration of the part. T or F? | True
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