Radiation Calculation
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SPR8-230.621.01.03.02 61
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Calculate the dose area product
The dose area product, DAP, is calculated with Equation (1):
Equation (1): DAP = Y x S
x
x S
y
x Q x k
❏ Y (µGy x m
2
/mAs) - conversion factor
❏ S
x
- scale index value for collimator adjustment (x-axis)
❏ S
y
- scale index value for collimator adjustment (y-axis)
❏ Q (mAs) - quantity of charge during exposure
❏ k (cm
2
/m
2
) - constant. k= 6.40 (cm
2
/m
2
)
◆ Read the value of Y (µGy x m
2
/mAs) from Diagram 1, corresponding to the
tube voltage (kV) used during exposure.
◆ Calculate the dose area product, DAP, with Equation (1).
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