MOD 4 - Technical Factors and Adjustments

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Last updated 3:19 PM on 8/24/26
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14 Terms

1
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between kVp ranging from 55-85, every 1 kVp =

  • 10% radiation intensity increase

  • 10 kVp = 100%


2
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doubling mAs =

doubling dose/intensity

3
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how to double kVp

increasing it by 15% (kVp x 1.15)

4
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every 5cm part thickness change requires a

100% increase or 50% decrease in radiation

5
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For SID changes adjust…

mAs, as SID has no effect on kVP

6
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Every ~50 cm SID change =

2/1 or 1/2 Rad

7
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Every ~25 cm SID change =

3/2 or 2/3 Rad

8
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Grid Ratio and GCF

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9
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Fugi

  • EI name

  • acceptance range

  • change of 100%

  • relation to acceptance numbers


  • S#

  • 100-250

  • doubel or half S#

  • inverse


10
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Carestream

  • EI

  • 1800-2200

  • +-300 of EI

  • direct


11
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Phillips (old)

  • EI

  • 350-600

  • each step of EI reflects a 25% change

  • inverse


12
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Phillips (new)

  • EXI

  • 125-500

  • doubel or half EXI

  • direct


13
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patient size increases but same body part?

  • if the kVp is at the top of the range, increase mAs

  • if the kVp isn’t at the top, use split technique


14
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Additive and Destructive diseases → check on LH