Principles of Exposure & Image Quality
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| what is the unit to indicate the total quantity of x-rays in an exposure? | mAs milliamperes-seconds
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| Which of the following will result in increased radiographic density? 1. increased mA 2. Increased exposure time 3. Decreased source-image receptor distance Choose A. 1 & 2 B. 1 &3 C. 2 & 3 D. 1,2,3, | A 1 & 2
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| The mass density of the body part is referred to as _____________? | tissue density
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| The primary controller of radiographic density is __________. | mAs
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| The difference in radiographic density btwn any 2 adjacent portions of the image is called ____________ | Contrast
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| The primary factor controlling radiographic constrast & penetration is ______________ A. mA B. exposure time C. mAs D. kVp | D. kVp
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| high contrast produced by low kVp results in an image with __________________________ | a short scale of contrast
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| Generalized unwanted exposure on the image is called _________________ | fog
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| A decrease in SID will result in _______________ | a increase of SID source image receptor distance
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| a mispresentation in the size and shape of the strucuture being examined is called __________ | Distortion
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| the fuzzy unsharpness at the edges of structures or body parts is called _______________ | fog
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| what is OID | object-image receptor distance
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| what is penumbra | unsharp edges
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| What is the inverse law? | intensity is inversely proportional to the square of the distance
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| what does SID stand for ? | source image receptor distance
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| what is "size distortion"? | magnification of a part
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| what is elongation ? | object appears longer
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| What is "shape distortion"? | result of unequal magnification
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| what is "foreshortening"? | object appears shorter
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| What is density? | overall blackness on the image
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| long scale contrast? | Produced by high kVp
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| what is contrast? | difference in density btwm adjacent structures
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| What is short scale contrast? | produced by low kVp
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| what is quantum mottle? | grainy or mottled image
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