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Radt 456

ARRT registry review covering image acquisition and evaluation

QuestionAnswer
List two types of distortion Size (magnification) Shape (elongation/foreshortening)
What measurement is used to express recorded detail? lp/mm
What will an increase in OID do to magnification? Increase it
What type of relationship does focal spot size have with recorded detail? Inverse
List two ways to minimize voluntary motion Good communication Suspend respiration
List three ways to minimize involuntary motion Short exposure time Support and stabilization Immobilization devices
What happens to recorded detail as phospher size increases? Decreases
What is the term form luminescence that lingers after x-ray is terminated? Afterglow
What type of relationship does mAs have with density? Direct
What type of relationship does kVp have with contrast Inverse
What is the conversion factor for an 8:1 grid? 4
How much of a change in mAs is necessary to create a noticeable change in density? 30%
What is the primary goal of filtration? reduce patient dose
What is grid frequency? Number of lead strips per inch
Anode heel effect creates greater intensity at which end of the beam? Cathode
What happens to optical density as developer temperature increases? Increases
High contrast is what type of scale? Short
What does short scale contrast do to film latitude? Decreases it
What type of relationship does kVp have with scatter radiation? Direct
What is the primary function of a grid? Absorbs scatter radiation before it reaches IR
Base plus fog should account for no more than this much density 0.2
Name the two types of AEC's Phototimer and Ionization Chamber
What type of relationship does SID have with magnification? Inverse
What effect does an increase in focal spot size have on recorded detail? Decreases it
List three rare earth phosphers Gadolinium, Lanthanum and Yttrium
A phosphor's ability to absorb x-ray energy and convert it to fluorescent light energy is known as what? Conversion efficiency
What effect does the use of an intensifying screen have on patient dose? Decreases it
What term describes the amount of blackness on an image? Density
As thickness and density of a tissue increases, what happens to the production of scattered radiation? Increases
Additive type disease processes will cause what effect on density? Decrease it
Created by: jaminton
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