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rtec

study guide 4

QuestionAnswer
Radiolucent X rays are able to penetrate
Radiopaque X rays can not easily penetrable
Focal Spot Not a single spot but a specific area
Penumbra "False shadow" - blur on edges, small detail
Umbra Sharp detail, no blurring on edges
Photographic Qualities Density and contrast
Geometric Qualities Detail and distortion
OID Object to image distance
SID Source to image distance
SOD Source to object distance
Inverse Square Law I1/I2=(D2)^2/(D1)^2
Controlling factor for Contrast kVp
Influencing factors for Contrast Subject contrast (Differential absorption), Beam filtration, Beam restriction, Grids, SID
Controlling factor for Density mAs
Influencing factors for Density SID, Beam filtration, Beam restriction, Body thickness, Grids
Density Overall darkening of an image
Contrast Difference between dark & light areas
kVp chart (->) High contrast, short scale, narrow latitude, less grey, decrease density
kVp chart (<-) Low contrast, long scale, wide latitude, more grey, increase density
1/2 (halfing) density mAs: /2 kVp: x0.85
double density mAs: x2 kVp: x1.15
mAs formula milliampere x time (seconds)
Created by: user-2045584
 

 



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