charts, compensations, formulas, applications
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Help!
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| What are the 4 primary exposure factors? | Kvp
Ma
Time
SID
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| What does each control |
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| Mas | Ma x time =Mas
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| Is this a direct or indirect relationship? |
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| when ever you see distance its what? | Squared
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| Whenever you see time you convert it to what? | A decimal
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| Alara | Cr/dr -histogram
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| Purpose of technique charts | Reference for technique selection for anatomic area. Should be room/specific due to equipment. Considers pathology.
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| If a caliper is used to measure pt. Thickness were should you measure | at CR level
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| Variable kvp chart | Mas remains constant. Kvp values according to part thickness. List baseline kv and use +2 kv per cm
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| What are the disadvantages of a variable kvp chart | variable contrast
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| What are the advantages of a variable kvp chart | Less pt dose (because mas is constant)
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| Fixed kvp chart | Mas varies, is altered for part thickness. Requires at least 30% change to see.
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| 100% doubles 50% halves |
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| Advantage of a fixed kvp chart | Contrast does not change
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| Disadvantage of a fixed kvp chart | Pt. Dose increases (because your increasing your mas
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| Which chart is better for children | Fixed kvp chart because we can lower our mas
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| chart development | Phantoms, calipers, calculator, objective/subjective- Bt, Std & high contrast
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| When using a variable kvp chart what must be down in order to select kv | A measurement using calipers
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| rules of thumb for peds | infants 0-2 use 1/4 0f mas
pre school 2-6 use 1/2 of mas
school 6-12 use 3/4 of mas
teens >12 no change
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| casts: rule of thumb dry plaster | plaster- dry is easier to penetrate
2 x mas or increase 10 kv
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| casts: rule of thumb wet plaster | plaster- wet is harder to penetrate
3 x mas or increase 15 kv
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| casts: fiberglass | increase 5 kv
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| beam restriction: rules of thumb when collimating | from 14x 17 to 10 x 12 from 14x 17 to 8x 10
40% more mas or +5 kv 60% more mas or +10 kv
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| how are ma and time related | indirectly
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| ma controls | quantity and density
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| time controls | motion and recorded detail
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| technique conversion formula for ma and time | ma x t = mas ma1= t2
ma2 t1
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| technique conversion formula for mas and distance | based upon isl (what is law and formula)
mas1=(sid1)2 if no time just use ma
mas2 (sid2)2 if no ma just use time
DISTANCE IS ALWAYS SQUARED IN FORMULAS
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| how are mas and distance related | direct relationship
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| technique conversion formulas | 15% kvp rule: if increase kvp by 15% will double density and decrease contrast
if decrease kvp by 15% will half density and increase contrast
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| compensation for changes in kvp to change contrast but maintain density | incr. 15%= 1/2 mas (50%)
decr. 15%= 2 x mas (100%)
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Created by:
eckoultd1972
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