2
To correct for a density error is determined by multiplying or dividing the mAs by
25% to 35%
A ___ change is needed to see a change in denisty
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dbl the mAs or reducing the mAs by 50%
The 15% rule states changing kVp by 15% is same as:
mAs1/mAs2 = gcf1/gcf2
Grid conversion formula
* kVp by 1.15
15% Rule Increase Density:
* kVp by 0.85
15% Rule Decrease Density:
* kVp by 1.15 and divide mAs by 2
15% Rule (Maintain Density) Increasing
* kVp by 0.85 and multiply the mAs by 2
15% Rule (Maintain Density) Decreasing
1/2 = (d2)2/(d1)2
Inverse Square Law Formula
mAs1/mAs2 = (Sid1)2/(sid2)2
Density Maintenance formula
This relationship between distance and x-ray beam intensity is
Definition of Inverse square law
adjusts mAs when the SID is changed
Definition of Density Maintenace formula
mAs1/mAs2 =RS2/RS1
Film screen speed conversion formula
4 to 5, 2
Part Tickness states for every _ to _ cm the mAs should be adjusted by a factor of _
changing kVp by 15% same as changing mAs by 50%
15% rule
a mathematical calculation for adjusting the mAs to change the SID
density maintenance formula
what is the grid conversion factor for No Grid
1
what is the grid conversion factor for 5 to 1
2
what is the grid conversion factor for 6 to 1
3
what is the grid conversion factor for 8 to 1
4
what is the grid conversion factor for 10 to 1
5
what is the grid conversion factor for 12 to 1
5
what is the grid conversion factor for 16 to 1
6
Geometric unsharpness formula
What is the Geometric Unsharpness formula, F.S.S *O.I.D Divided by S.O.D=O.I.D.-S.I.D.
kVp Barium
90 -120
Iodine
70-80 kVp
changing kVp by 15% same as changing mAs by 50%
Definition of 15% rule
dbl the mAs or reducing the mAs by 50%
The 15% rule states changing kVp by 15% is same as
* kVp by 1.15
15% Rule Increase Density:
* kVp by 0.85
15% Rule Decrease Density:
* kVp by 1.15 and divide mAs by 2
15% Rule (Maintain Density) Increaseing
* kVp by 0.85 and multiply the mAs by 2
15% Rule (Maintain Density) Decreasing
1/2 = (d2)2/(d1)2
Inverse Square Law Formula
mAs1/mAs2 =RS2/RS1
Film screen speed conversion formula
Larger field size
Decreasing Collimation
Smaller field size
Increasing Collimation
increase density
If you are decreasing collimation, it ___ density
decreases density
If you are increaseing collimation, it ___ density
4 to 5, 2
Part Tickness states for every _ to _ cm the mAs should be adjusted by a factor of _
cathode side
anode heel effect states the __ end is stronger
a mathematical calculation for adjusting the mAs to change the SID
Defintion of density maintenance formula

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