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

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