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Cards In This Set
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MAs
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Milliampere seconds, product of "mA" and "s"
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MAs
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Quality, images
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SID
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Source to image distance
the normal distanse between the source of xrays and the image receptor |
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Photographic qualities
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Density
contrast |
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Geometric qualities
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Recorded detail
distortion |
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Denisty
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Degree of blackening of the image.
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MAs
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The Main controlling factor of density.
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Reciprocity law
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To result in equivalent mAs values, mA & time must change in the opposite direction by the same factor
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PATIENT FACTORS
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Cell composition
relative atomic number thickness cell density pathology |
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KVp
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Controls the penetrating ablilty of hte primary beam which can easily penetrate less dense tissue
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KVp
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Determining factor, Highest Energy Level (peak) of the x-ray photons within the primary beam
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KVp
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Affects density by means of the15% rule
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15% rules says
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If you increase KVp by 15% you will double the density on the image, image will be 2x as dark.
if you decrease by 15% you will halve the density. |
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KVp= 80
mA= 200 time=.1s |
20 mAs
15% of 80= 92 new mAs 40 mAs to return to original density decrease or increase by 1/2 or 2x, mA or time |
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Distance
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Affects density via the
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