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Chapter7

Principles of Exposure & Image Quality

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

 



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